Telit Wireless Solutions Network Hardware UC864 User Manual

UC864 Hardware User Guide

1vv0300766a Rev.1 31/01/08

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

Contents

Overview ...........................................................................................................................6

Mechanical Dimensions...................................................................................................7

UC864-E module connections.........................................................................................8

3.1

PIN-OUT...................................................................................................................................8

3.1.1

UC864-E Antenna connector..........................................................................................................11

Hardware Commands ....................................................................................................12

4.1

Turning ON the UC864-E......................................................................................................12

4.2

Turning OFF the UC864-E....................................................................................................14

Hardware shutdown........................................................................................................................14

Hardware Unconditional Restart.....................................................................................................15

4.2.1

4.2.2

Power Supply .................................................................................................................17

5.1

Power Supply Requirements...............................................................................................17

5.2

General Design Rules ..........................................................................................................19

5.2.1

Electrical Design Guidelines...........................................................................................................19

5.2.1.1 + 5V input Source Power Supply Design Guidelines .................................................................19

5.2.1.2 + 12V input Source Power Supply Design Guidelines ...............................................................20

5.2.1.3 Battery Source Power Supply Design Guidelines ......................................................................22

5.2.1.4 Battery Charge control Circuitry Design Guidelines ...................................................................22

5.2.2

5.2.3

Thermal Design Guidelines ............................................................................................................24

Power Supply PCB layout Guidelines ............................................................................................25

Antenna...........................................................................................................................26

6.1

6.2

Antenna Requirements ........................................................................................................26

Antenna - Installation Guidelines........................................................................................27

Logic level specifications..............................................................................................28

7.1

Reset signal ..........................................................................................................................29

Serial Ports .....................................................................................................................30

8.1

8.2

MODEM SERIAL PORT.........................................................................................................30

RS232 level translation ........................................................................................................32

5V UART level translation...............................................................................................................35

USB Port .........................................................................................................................37

9.1

Communication ports combinations..................................................................................37

10 Audio Section Overview ................................................................................................38

10.1 Generality..............................................................................................................................38

10.2 Definitions.............................................................................................................................38

page 3 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

10.3 Selection................................................................................................................................38

10.4 Electrical Characteristics.....................................................................................................39

10.4.1

10.4.2

Input lines (microphone) .................................................................................................................39

Output lines (speaker) ....................................................................................................................40

11 General Purpose I/O.......................................................................................................41

11.1 Logic level specifications....................................................................................................42

11.2 Using a GPIO Pad as INPUT ................................................................................................43

11.3 Using a GPIO Pad as OUTPUT ............................................................................................43

11.4 Using the Alarm Output GPIO6 ...........................................................................................43

11.5 Using the Buzzer Output GPIO7..........................................................................................44

11.6 Indication of network service availability...........................................................................45

11.7 RTC Bypass out....................................................................................................................46

11.8 VAUX1 power output............................................................................................................46

11.9 Mounting UC864-E on your board.......................................................................................47

11.9.1

Debug of the UC864-E in production..............................................................................................48

12 Conformity Assessment Issues....................................................................................49

13 SAFETY RECOMMANDATIONS.....................................................................................50

14 Document Change Log..................................................................................................51

page 4 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

DISCLAIMER

The information contained in this document is the proprietary information of Telit Communications

S.p.A. and its affiliates (“TELIT”). The contents are confidential and any disclosure to persons other

than the officers, employees, agents or subcontractors of the owner or licensee of this document,

without the prior written consent of Telit, is strictly prohibited.

Telit makes every effort to ensure the quality of the information it makes available. Notwithstanding the

foregoing, Telit does not make any warranty as to the information contained herein, and does not

accept any liability for any injury, loss or damage of any kind incurred by use of or reliance upon the

information.

Telit disclaims any and all responsibility for the application of the devices characterized in this

document, and notes that the application of the device must comply with the safety standards of the

applicable country, and where applicable, with the relevant wiring rules.

Telit reserves the right to make modifications, additions and deletions to this document due to

typographical errors, inaccurate information, or improvements to programs and/or equipment at any

time and without notice. Such changes will, nevertheless be incorporated into new editions of this

application note.

page 5 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

1 Overview

The aim of this document is the description of some hardware solutions useful for developing a product with the

Telit UC864-E module.

In this document all the basic functions of a mobile phone will be taken into account; for each one of them a

proper hardware solution will be suggested and eventually the wrong solutions and common errors to be

avoided will be evidenced. Obviously this document cannot embrace the whole hardware solutions and products

that may be designed. The wrong solutions to be avoided shall be considered as mandatory, while the

suggested hardware configurations shall not be considered mandatory, instead the information given shall be

used as a guide and a starting point for properly developing your product with the Telit UC864-E module. For further

hardware details that may not be explained in this document refer to the Telit UC864-E Product Description

document where all the hardware information is reported.

NOTICE

(EN) The integration of the GSM/GPRS/EGPRS/WCDMA/HSDPA UC864-E cellular module within user

application shall be done according to the design rules described in this manual.

(IT) L’integrazione del modulo cellulare GSM/GPRS/EGPRS/WCDMA/HSDPA UC864-E all’interno

dell’applicazione dell’utente dovrà rispettare le indicazioni progettuali descritte in questo manuale.

(DE) Die integration des UC864-E GSM/GPRS/EGPRS/WCDMA/HSDPA Mobilfunk-Moduls in ein Gerät

muß gemäß der in diesem Dokument beschriebenen Kunstruktionsregeln erfolgen

(SL) Integracija GSM/GPRS/EGPRS/WCDMA/HSDPA UC864-E modula v uporabniški aplikaciji bo morala

upoštevati projektna navodila, opisana v tem piročniku.

(SP) La utilización del modulo GSM/GPRS/EGPRS/WCDMA/HSDPA UC864-E debe ser conforme a los

usos para los cuales ha sido deseñado descritos en este manual del usuario.

(FR) L’intégration du module cellulaire GSM/GPRS/EGPRS/WCDMA/HSDPA UC864-E dans l’application

de l’utilisateur sera faite selon les règles de conception décrites dans ce manuel.

UC864-E

The information presented in this document is believed to be accurate and reliable. However, no responsibility is

assumed by Telit Communications S.p.A. for its use, nor any infringement of patents or other rights of third

parties which may result from its use. No license is granted by implication or otherwise under any patent rights of

Telit Communications S.p.A. other than for circuitry embodied in Telit products. This document is subject to

change without notice.

page 6 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

2 Mechanical Dimensions

The Telit UC864-E module overall dimensions are:

•

Length:

Width:

Thickness:

36.2 mm

30 mm

4.8mm

page 7 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

3 UC864-E module connections

3.1 PIN-OUT

UC864-E uses an 80-pin Molex p.n. 53949-0878 male connector for the connections with the external

applications. This connector matches the 54150-0878 models.

Internal

Pull up

Type

UC864-E

Signal

I/O

Function

Power Supply

VBATT

GND

Main power supply

Ground

Power

GND

Ground

GND

Ground

Audio

AXE

Hands-free switching

CMOS 2.6V

Audio

100KΩ

EAR_HF+

AO Hands-free ear output, phase +

10 EAR_HF-

11 EAR_MT+

12 EAR_MT-

13 MIC_HF+

14 MIC_HF-

15 MIC_MT+

16 MIC_MT-

AO Hands-free ear output, phase -

Audio

AO Handset earphone signal output, phase +

AO Handset earphone signal output, phase -

AI Hands-free microphone input; phase +

AI Hands-free microphone input; phase -

AI Handset microphone signal input; phase+

AI Handset microphone signal input; phase-

SIM Card Interface

Audio

18¹SIMVCC

19 SIMRST

20 SIMIO

External SIM signal – Power supply for the SIM

External SIM signal – Reset

1.8 / 3V

I/O External SIM signal - Data I/O

21 SIMIN

External SIM signal - Presence (active low)

External SIM signal – Clock

Trace

47KΩ

22 SIMCLK

¹On this line a maximum of 10nF bypass capacitor is allowed

page 8 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

Internal

Pull up

Type

UC864-E

Signal

I/O

Function

23 RX_TRACE

RX Data for debug monitor

TX Data for debug monitor

CMOS 2.6V

24 TX_TRACE

Prog. / Data + Hw Flow Control

Serial data input (TXD) from DTE

25 C103/TXD

26 C104/RXD

27 C107/DSR

28 C106/CTS

29 C108/DTR

30 C125/RING

31 C105/RTS

32 C109/DCD

CMOS 2.6V

Serial data output to DTE

Output for Data set ready signal (DSR) to DTE

Output for Clear to send signal (CTS) to DTE

Input for Data terminal ready signal (DTR) from DTE

Output for Ring indicator signal (RI) to DTE

Input for Request to send signal (RTS) from DTE

Output for Data carrier detect signal (DCD) to DTE

Miscellaneous Functions

Analog input used to sense whether a peripheral device is

35 USB_ID

AI connected, and determine the peripheral type, a host or a

peripheral

Analog

36 PCM_CLOCK

I/O PCM clock out

CMOS 2.6V

DAC and ADC

37 ADC_IN1

38 ADC_IN2

39 ADC_IN3

40 DAC_OUT

AI Analog/Digital converter input

AO Digital/Analog converter output

Miscellaneous Functions

A/D

D/A(PDM)

45 STAT_LED

Status indicator led

Ground

CMOS 1.8V

Ground

46 GND

Power supply for the internal USB transceiver. This pin is

configured as an analog input or an analog output depending

upon the type of peripheral device connected.

/AO

48 USB_VBUS

4.4V ~5.25V

49 PWRMON

50 VAUX1

Power ON Monitor

CMOS 2.6V

2.85V

Power output for external accessories

51 CHARGE

52 CHARGE

AI Charger input

Power

Input command for switching power ON or OFF (toggle

command).

Pull up to

VBATT

53 ON/OFF*

54 RESET#

Reset input

AO VRTC Backup capacitor

Telit GPIOs

55 VRTC

Power

56 TGPIO_19

57 TGPIO_11

58 TGPIO_20

59 TGPIO_04

60 TGPIO_14

I/O Telit GPIO19 Configurable GPIO

I/O Telit GPIO11 Configurable GPIO

I/O Telit GPIO20 Configurable GPIO

I/O Telit GPIO4 Configurable GPIO

I/O Telit GPIO14 Configurable GPIO

CMOS 2.6V

page 9 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

Internal

Pull up

Type

UC864-E

Signal

I/O

Function

61 TGPIO_15

I/O Telit GPIO15 Configurable GPIO

I/O Telit GPIO12 Configurable GPIO

CMOS 2.6V

62 TGPIO_12

TGPIO_10/

I/O Telit GPIO10 Configurable GPIO / PCM Data Output

I/O Telit GPIO22 Configurable GPIO

CMOS 2.6V

CMOS 1.8V

CMOS 2.6V

PCM_TX

64 TGPIO_22

TGPIO_18/

I/O Telit GPIO18 Configurable GPIO / PCM Data input

PCM_RX

66 TGPIO_03

I/O Telit GPIO3 Configurable GPIO

I/O Telit GPIO8 Configurable GPIO

CMOS 2.6V

67 TGPIO_08

68 TGPIO_06 / ALARM I/O Telit GPIO6 Configurable GPIO / ALARM

70 TGPIO_01

I/O Telit GPIO1 Configurable GPIO

TGPIO_17/

I/O Telit GPIO17 Configurable GPIO / PCM Sync

I/O Telit GPIO21 Configurable GPIO

CMOS 2.6V

PCM_SYNC

72 TGPIO_21

TGPIO_07/

I/O Telit GPIO7 Configurable GPIO / Buzzer

BUZZER

74 TGPIO_02

75 TGPIO_16

76 TGPIO_09

77 TGPIO_13

I/O Telit GPIO02 I/O pin

CMOS 2.6V

I/O Telit GPIO16 Configurable GPIO

I/O Telit GPIO9 Configurable GPIO

I/O Telit GPIO13 Configurable

TGPIO_05/

I/O Telit GPIO05 Configurable GPIO / Transmitter ON monitor

CMOS 2.6V

RFTXMON

USB Interface

79 USB_D+

I/O USB differential Data (+)

2.8V~3.6V

80 USB_D-

I/O USB differential Data (-)

RESERVED

NOTE: RESERVED pins must not be connected

RTS should be connected to the GND (on the module side) if flow control is not used

page 10 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

NOTE: If not used, almost all pins should be left disconnected. The only exceptions are the following

pins:

Signal

VBATT

GND

Function

Main power supply

Ground

GND

Ground

GND

Ground

GND

Ground

C103/TXD

C104/RXD

C105/RTS

ON/OFF*

RESET#

Serial data input (TXD) from DTE

Serial data output to DTE

Input for Request to send signal (RTS) from DTE

Input command for switching power ON or OFF (toggle command).

Reset input

Analog input used to sense whether a peripheral device is

connected, and determine the peripheral type, a host or a peripheral

Power supply for the internal USB transceiver. This pin is configured

as an analog input or an analog output depending upon the type of

peripheral device connected.

USB_ID

USB_VBUS

USB_D+

USB_D-

USB differential Data (+)

USB differential Data (-)

3.1.1 UC864-E Antenna connector

The UC864-E module is equipped with a RF connector from Murata, GSC type P/N MM9329-2700B.

The counterpart suitable is Murata MXTK92 Type or MXTK88 Type.

page 11 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

4 Hardware Commands

4.1 Turning ON the UC864-E

To turn on UC864-E, the pad ON# must be tied low for at least 1 second and then released.

The maximum current that can be drained from the ON# pad is 0,1 mA.

A simple circuit to do it is:

ON#

Power ON impulse

GND

NOTE: UC864-E turns fully on also by supplying power to the USB_VBUS pin (provided there's a battery on the

VBATT pads). Care must be taken to avoid supplying power to the USB_VBUS pin before the module turns on.

To check if the UC864-E has powered on, the hardware line PWRMON should be monitored. When PWRMON goes

high, the module has powered on.

NOTE: don't use any pull up resistor on the ON# line, it is internally pulled up. Using pull up resistor may bring to

latch up problems on the UC864-E power regulator and improper power on/off of the module. The line ON# must be

connected only in open collector configuration.

NOTE: In this document all the lines that are inverted, hence have active low signals are labeled with a name that

ends with a "#" or with a bar over the name.

NOTE: UC864-E turns fully on also by supplying power to the Charge pad (provided there's a battery on the VBATT

pads).

page 12 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

For example:

1- Let's assume you need to drive the ON# pad with a totem pole output of a 1.8/5 V microcontroller

(uP_OUT1):

2- Let's assume you need to drive the ON# pad directly with an ON/OFF button:

1.8 / 5V

page 13 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

4.2 Turning OFF the UC864-E

The turning off of the device can be done in three ways:

• By software command (see UC864-E Software User Guide)

• By hardware shutdown

• By Hardware Unconditional Restart

When the device is shut down by software command or by hardware shutdown, it issues to the

network a detach request that informs the network that the device will not be reachable any more.

4.2.1 Hardware shutdown

To turn OFF UC864-E, first, you MUST cut off supplying power to the USB_VBUS pin, then the pad

ON# must be tied low for at least 2 seconds and then released.

The same circuitry and timing for the power on shall be used.

The device shuts down after the release of the ON# pad.

NOTE: To turn OFF UC864-E, first of all, you MUST cut off supplying power to the USB_VBUS, or the module does

not turn off

TIP: To check if the device has powered off, the hardware line PWRMON should be monitored. When PWRMON goes

low, the device has powered off.

page 14 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

4.2.2 Hardware Unconditional Restart

To unconditionally restart UC864-E, the pad RESET# must be tied low for at least 200 milliseconds

and then released.

The maximum current that can be drained from the ON# pad is 0,15 mA.

A simple circuit to do it is:

RESET#

Unconditional Restart

impulse

GND

NOTE: Do not use any pull up resistor on the RESET# line or any totem pole digital output. Using pull up resistor

may bring to latch up problems on the UC864-E power regulator and improper functioning of the module. The line

RESET# must be connected only in open collector configuration.

TIP: The unconditional hardware Restart should be always implemented on the boards and software should use it

as an emergency exit procedure.

page 15 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

For example:

1- Let's assume you need to drive the RESET# pad with a totem pole output of a +1.8/5 V micro

controller (uP_OUT2):

+1.8 / 5V

* This signal is internally pulled up so the pin can be left floating if not used.

NOTE: If UC864-E is connected as USB slave (considering also the presence of VBATT supply), when

powered off it automatically switch on again.

page 16 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

5 Power Supply

The power supply circuitry and board layout are a very important part in the full product design and

they strongly reflect on the product overall performances, hence read carefully the requirements and

the guidelines that will follow for a proper design.

5.1 Power Supply Requirements

POWER SUPPLY

Nominal Supply Voltage

Max Supply Voltage

3.8V

4.2

Supply Voltage Range

3.51 – 4.2

The UC864-E power consumptions are:

UC864-E (GSM900)

Mode

Average (mA)

IDLE mode

Mode description

Stand by mode; no call in progress

Normal mode: full functionality of the module (MF=9)

Disabled TX and RX; module is not registered on the

network

AT+CFUN=1

AT+CFUN=4

21,7

21,3

Power saving: CFUN=0 module registered on the network

and can receive voice call or an SMS; but it is not possible

to send AT commands; module wakes up with an

unsolicited code (call or SMS) or rising RTS line. CFUN=5

full functionality with power saving; module registered on

the network can receive incoming calls and SMS – (MF=2)

AT+CFUN=0 or

AT+CFUN=5

3,3

GSM TX and RX mode

GSM Sending data mode

Min power level

Max power level

139.1

340.8

GPRS (class 10) TX and RX mode

GPRS Sending data mode (3 slot TX)

WCDMA Call in progress

Max power level

728.2

WCDMA

Max power level

619,7

In GSM/GPRS mode, RF transmission is not continuous and it is packed into bursts at a base

frequency of about 216 Hz, and the relative current peaks can be as high as about 2A. Therefore the

power supply has to be designed in order to withstand with these current peaks without big voltage

drops; this means that both the electrical design and the board layout must be designed for this

current flow.

page 17 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

If the layout of the PCB is not well designed a strong noise floor is generated on the ground and the

supply; this will reflect on all the audio paths producing an audible annoying noise at 216 Hz; if the

voltage drop during the peak current absorption is too much, then the device may even shutdown as a

consequence of the supply voltage drop.

TIP: The electrical design for the Power supply should be made ensuring it will be capable of a peak current output

of at least 2 A.

page 18 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

5.2 General Design Rules

The principal guidelines for the Power Supply Design embrace three different design steps:

•

The electrical design

The thermal design

The PCB layout.

5.2.1 Electrical Design Guidelines

The electrical design of the power supply depends strongly from the power source where this power is

drained. We will distinguish them into three categories:

•

+5V input (typically PC internal regulator output)

+12V input (typically automotive)

Battery

5.2.1.1 + 5V input Source Power Supply Design Guidelines

•

The desired output for the power supply is 3.8V, hence there's not a big difference between the

input source and the desired output and a linear regulator can be used. A switching power supply

will not be suited because of the low drop out requirements.

•

When using a linear regulator, a proper heat sink shall be provided in order to dissipate the power

generated.

A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current

absorption peaks close to UC864-E, a 100μF tantalum capacitor is usually suited.

Make sure the low ESR capacitor on the power supply output (usually a tantalum one) is rated at

least 10V.

A protection diode should be inserted close to the power input, in order to save the electrical circuit

from power polarity inversion.

page 19 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

An example of linear regulator with 5V input is:

5.2.1.2 + 12V input Source Power Supply Design Guidelines

•

The desired output for the power supply is 3.8V; hence due to the big difference between the input

source and the desired output, a linear regulator is not suited and shall not be used. A switching

power supply will be preferable because of its better efficiency especially with the 2A peak current

load represented by UC864-E.

•

When using a switching regulator, a 500kHz or more switching frequency regulator is preferable

because of its smaller inductor size and its faster transient response. This allows the regulator to

respond quickly to the current peaks absorption.

For car Pb battery the input voltage can rise up to 15.8V and this should be kept in mind when

choosing components: all components in the power supply must withstand this voltage. The same

consideration has to be applied to the voltage peaks that in a Car Application could rise to 100V.

•

A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current

absorption peaks, a 100μF tantalum capacitor is usually suited.

Make sure the low ESR capacitor on the power supply output (usually a tantalum one) is rated at

least 10V.

A spike protection diode should be inserted close to the power input for Car applications, in order

to clean the supply from spikes.

A protection diode should be inserted close to the power input, in order to save UC864-E from

power polarity inversion. This can be the same diode as for spike protection.

page 20 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

An example of switching regulator with 12V input is in the below schematic (it is split in 2 parts):

page 21 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

5.2.1.3 Battery Source Power Supply Design Guidelines

•

The desired nominal output for the power supply is 3.8V and the maximum voltage allowed is

4.2V, hence a single 3.7V Li-Ion cell battery type is suited for supplying the power to the Telit

UC864-E module.

•

The three cells Ni/Cd or Ni/MH 3.6 V Nom. battery types or 4V PB types MUST NOT BE

DIRECTLY USED since their maximum voltage can rise over the absolute maximum voltage for

UC864-E and damage it.

NOTE: DON'T USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with UC864-E. Their use can

lead to overvoltage on UC864-E and damage it. USE ONLY Li-Ion battery types.

•

A Bypass low ESR capacitor of adequate capacity must be provided in order to cut the current

absorption peaks, a 100μF tantalum capacitor is usually suited.

•

Make sure the low ESR capacitor (usually a tantalum one) is rated at least 10V.

A protection diode should be inserted close to the power input, in order to save UC864-E from

power polarity inversion. Otherwise the battery connector should be done in a way to avoid polarity

inversions when connecting the battery.

•

The battery capacity must be at least 500mAh in order to withstand the current peaks of 2A; the

suggested capacity is from 500mAh to 1000mAh.

5.2.1.4 Battery Charge control Circuitry Design Guidelines

The charging process for Li-Ion Batteries can be divided into 4 phases:

•

Qualification and trickle charging

Fast charge 1 - constant current

Final charge - constant voltage

Maintenance charge

The qualification process consists in a battery voltage measure, indicating roughly its charge status. If

the battery is deeply discharged, that means its voltage is lower than the trickle charging threshold,

then the charge must start slowly possibly with a current limited pre-charging process keeping the

current very low respect to the fast charge value: the trickle charging.

During the trickle charging the voltage across the battery terminals rises; when it reaches the fast

charge threshold level the charging process goes into fast charge phase.

During the fast charge phase the process proceeds with a current limited charging; this current limit

depends the complete charge required time and from the battery pack capacity. During this phase the

voltage across the battery terminals still raises but at a lower rate.

Once the battery voltage reaches its maximum voltage then the process goes into its third state: Final

charging. The voltage measure to change the process status into final charge is very important. It

must be ensured that the maximum battery voltage is never exceeded, otherwise the battery may be

damaged and even explode. Moreover regarding the constant voltage final chargers, the constant

voltage phase (final charge) must not start before the battery voltage has reached its maximum value;

otherwise the battery capacity will be highly reduced.

The final charge is done using constant voltage.

page 22 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

The constant voltage charge proceeds with a fixed voltage regulator (very accurately set to the

maximum battery voltage) and hence the current will decrease while the battery is becoming charged.

When the charging current falls below a certain fraction of the fast charge current value, then the

battery is considered fully charged, the final charge stops and eventually starts the maintenance.

The last phase is not properly a charging phase, since the battery at this point is fully charged and the

process may stop after the final charge. The maintenance charge provides an additional charging

process to compensate for the typical Li-Ion battery charge leak. It is done by issuing pulses with a

fixed time length, again few hundreds of ms, and a duty-cycle around 5% or less.

This last phase is not implemented in the UC864-E internal charging algorithm, so that the battery

once charged is left discharging down to a certain threshold so that it is cycled from full charge to

slight discharge even if the battery charger is always inserted. This guarantees that anyway the

remaining charge in the battery is a good percentage and that the battery is not damaged by keeping it

always fully charged (Li-Ion rechargeable battery usually deteriorates when kept fully charged).

Last but not least, in some applications it is highly desired that the charging process restarts when the

battery is discharged and its voltage drops below a certain threshold, UC864-E internal charger does

it.

As you can see, the charging process is not a trivial task to be done; moreover all these operations

should start only if battery temperature is inside a charging range, usually +5°C ÷ +45°C.

In order to satisfy this last requirement, the UC864-E measures the temperature of its internal

components even if it is not exactly the same as the battery temperature; but in common application

the two temperatures should not differ too much and the charging temperature range should be

guaranteed.

NOTE: All voltage thresholds are provided, inside UC864-E, in order to maximize Li-Ion battery

performances and do not need to be changed.

NOTE: In this application the battery charger input current must be limited to less than 400mA. This can

be done by using a current limited wall adapter as the power source.

NOTE: When starting the charger from Module powered off the startup will be in CFUN4; to activate the

normal mode the command AT+CFUN=1 has to be provided.

page 23 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

5.2.2 Thermal Design Guidelines

The thermal design for the power supply heat sink should be done with the following specifications:

•

Average current consumption during WCDMA transmission @PWR level max:

Average current consumption during class12 GPRS transmission @PWR level max: 930mA

620mA

NOTE: The average consumption during transmissions depends on the power level at which the device is requested

to transmit by the network. The average current consumption hence varies significantly.

Considering the very low current during idle, especially if Power Saving function is enabled, it is

possible to consider from the thermal point of view that the device absorbs current significantly only

during calls.

If we assume that the device stays into transmission for short periods of time (let's say few minutes)

and then remains for a quite long time in idle (let's say one hour), then the power supply has always

the time to cool down between the calls and the heat sink could be smaller than the calculated one for

930mA maximum RMS current, or even could be the simple chip package (no heat sink).

Moreover in the average network conditions the device is requested to transmit at a lower power level

than the maximum and hence the current consumption will be less than the 930mA, being usually

around 150mA.

For these reasons the thermal design is rarely a concern and the simple ground plane where the

power supply chip is placed can be enough to ensure a good thermal condition and avoid overheating.

For the heat generated by the UC864-E, you can consider it to be during transmission 1W max during

CSD/VOICE calls and 2W max during class12 GPRS upload.

This generated heat will be mostly conducted to the ground plane under the UC864-E; you must

ensure that your application can dissipate it.

In the WCDMA mode, since UC864-E emits RF signals continuously during WCDMA transmission,

you should pay special attention on how to dissipate the heat generated.

The current consumption will be up to about 620mA continuously at the maximum TX output power

(24dBm). Thus, you should arrange the PCB area as large as possible under UC864-E, which you will

mount. You can mount UC864-E on the large ground area of your application board and make many

ground vias for heat sink.

The peak current consumption in the GSM mode is higher than that in WCDMA. However, considering

the heat sink is more important with WCDMA.

As mentioned before, GSM signal is bursty. Thus, the temperature drift is more insensible than

WCDMA. Consequently, if you prescribe the heat dissipation in the WCDMA mode, you don’t need to

think more about the GSM mode

page 24 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

5.2.3 Power Supply PCB layout Guidelines

As seen on the electrical design guidelines the power supply shall have a low ESR capacitor on the

output to cut the current peaks and a protection diode on the input to protect the supply from spikes

and polarity inversion. The placement of these components is crucial for the correct working of the

circuitry. A misplaced component can be useless or can even decrease the power supply

performances.

•

The Bypass low ESR capacitor must be placed close to the Telit UC864-E power input pads or in

the case of a switching power supply it can be placed close to the inductor to cut the ripple

provided the PCB trace from the capacitor to UC864-E is wide enough to ensure a drop-less

connection even during the 2A current peaks.

•

The protection diode must be placed close to the input connector where the power source is

drained.

The PCB traces from the input connector to the power regulator IC must be wide enough to ensure

no voltage drops occur when the 2A current peaks are absorbed. Note that this is not made in

order to save power loss but especially to avoid the voltage drops on the power line at the current

peaks frequency of 216 Hz that will reflect on all the components connected to that supply,

introducing the noise floor at the burst base frequency. For this reason while a voltage drop of 300-

400 mV may be acceptable from the power loss point of view, the same voltage drop may not be

acceptable from the noise point of view. If your application doesn't have audio interface but only

uses the data feature of the Telit UC864-E, then this noise is not so disturbing and power supply

layout design can be more forgiving.

•

The PCB traces to UC864-E and the Bypass capacitor must be big enough to ensure no

significant voltage drops occur when the 2A current peaks are absorbed. This is for the same

reason as previous point. Try to keep this trace as short as possible.

The PCB traces connecting the Switching output to the inductor and the switching diode must be

kept as short as possible by placing the inductor and the diode very close to the power switching

IC (only for switching power supply). This is done in order to reduce the radiated field (noise) at the

switching frequency (100÷500 usually).

•

The use of a good common ground plane is suggested.

The placement of the power supply on the board should be done in such a way to guarantee that

the high current return paths in the ground plane are not overlapped to any noise sensitive circuitry

as the microphone amplifier/buffer or earphone amplifier.

•

The power supply input cables should be kept separate from noise sensitive lines such as

microphone/earphone cables.

page 25 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

6 Antenna

The antenna connection and board layout design are the most important part in the full product design

and they strongly reflect on the product overall performances, hence read carefully and follow the

requirements and the guidelines for a proper design.

6.1 Antenna Requirements

As suggested on the Product Description the antenna for a Telit UC864-E device shall fulfill the

following requirements:

ANTENNA REQUIREMENTS

Frequency range

Bandwidth

Depending by frequency band(s) provided by the

network operator, the customer shall use the

most suitable antenna for that/those band(s)

70 MHz in GSM850, 80 MHz in GSM900, 170

MHz in DCS & 140 MHz PCS

250 MHz in WCDMA2100 band

Gain

Gain < 3dBi

Impedance

Input power

50 ohm

> 33dBm(2 W) peak power in GSM

> 24dBm Average power in WCDMA2100

VSWR absolute max <= 10:1

VSWR

<= 2:1

recommended

Furthermore if the device is developed for the US market and/or Canada market, it shall comply with

the FCC and/or IC approval requirements:

This device is to be used only for mobile and fixed applications. The antenna(s) used for this

transmitter must be installed to provide a separation distance of at least 20 cm from all persons and

must not be co-located or operating in conjunction with any other antenna or transmitter. End-Users

must be provided with transmitter operation conditions for satisfying RF exposure compliance. OEM

integrators must ensure that the end user has no manual instructions to remove or install the UC864-E

module. Antennas used for this OEM module must not exceed 3dBi gain for mobile and fixed

operating configurations.

page 26 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

6.2 Antenna - Installation Guidelines

•

Install the antenna in a place covered by the GSM/WCDMA signal.

The Antenna must be installed to provide a separation distance of at least 20 cm from all persons

and must not be co-located or operating in conjunction with any other antenna or transmitter;

Antenna shall not be installed inside metal cases

•

Antenna shall be installed also according Antenna manufacturer instructions.

page 27 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

7 Logic level specifications

Where not specifically stated, all the interface circuits work at 2.6V CMOS logic levels. The following

table shows the logic level specifications used in the Telit UC864-E interface circuits:

For 2.6V CMOS signals:

Absolute Maximum Ratings -Not Functional

UC864-E

Parameter

Min

Max

Input level on any

digital pin when on

Input voltage on

-0.3V

+3.0V

-0.3V

+3.0 V

analog pins when on

Operating Range - Interface levels

UC864-E

Level

Min

Max

Input high level

Input low level

Output high level

Output low level

2.0V

2.9 V

-0.3V

2.2V

0.6V

2.6V

0.35V

For 1.8V signals:

Operating Range - Interface levels (1.8V CMOS)

UC864-E

Level

Min

1.5V

-0.3V

1.4V

Max

2.1V

0.5V

1.8V

0.35V

Input high level

Input low level

Output high level

Output low level

page 28 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

7.1 Reset signal

Signal

Function

I/O

PIN Number

RESET

Phone reset

RESET is used to reset the UC864-E module. Whenever this signal is pulled low, UC864-E is reset.

When the device is reset it stops any operation. After the release of the reset UC864-E is

unconditionally shut down, without doing any detach operation from the network where it is registered.

This behavior is not a proper shut down because any device is requested to issue a detach request on

turn off. For this reason the Reset signal must not be used to normally shutting down the device, but

only as an emergency exit in the rare case the device remains stuck waiting for some network

response.

The RESET is internally controlled on start-up to achieve always a proper power-on reset sequence,

so there's no need to control this pin on start-up. It may only be used to reset a device already on that

is not responding to any command.

NOTE: do not use this signal to turn off the UC864-E. Use the ON/OFF signal to perform this function or

the AT#SHDN command.

Reset Signal Operating levels:

Signal

Min

2.0V*

Max

2.2V

0.2V

RESET Input high

RESET Input low

* This signal is internally pulled up so the pin can be left floating if not used.

If unused, this signal may be left unconnected. If used, then it must always be connected with an

open collector transistor, to permit to the internal circuitry the power on reset and under voltage

lockout functions.

page 29 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

8 Serial Ports

The serial port on the Telit UC864-E is the interface between the module and OEM hardware.

2 serial ports are available on the module:

•

MODEM SERIAL PORT

MODEM SERIAL PORT 2 (DEBUG)

8.1 MODEM SERIAL PORT

Several configurations can be designed for the serial port on the OEM hardware, but the most

common are:

•

RS232 PC com port

microcontroller UART @ 2.6V - 3V (Universal Asynchronous Receive Transmit)

microcontroller UART @ 5V or other voltages different from 2.8V

Depending from the type of serial port on the OEM hardware a level translator circuit may be needed

to make the system work. The only configuration that doesn't need a level translation is the 2.6V

UART.

The serial port on UC864-E is a +2.6V UART with all the 7 RS232 signals. It differs from the PC-

RS232 in the signal polarity (RS232 is reversed) and levels. The levels for UC864-E UART are the

CMOS levels:

Absolute Maximum Ratings - Not Functional

UC864-E

Parameter

Min

Max

Input level on any

digital pin when on

Input voltage on

-0.3V

+3.0V

-0.3V

+3.0 V

analog pins when on

Operating Range - Interface levels

UC864-E

Level

Min

Max

Input high level

Input low level

Output high level

Output low level

2.0V

2.9 V

-0.3V

2.2V

0.6V

2.6V

0.35V

page 30 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

The signals of the UC864-E serial port are:

RS232

UC864-E

Pad

Signal

Name

Usage

Number

DCD

dcd_uart

RXD

tx_uart

TXD

rx_uart

DTR

dtr_uart

Data Carrier Detect

Transmit line *see Note

Receive line *see Note

Data Terminal Ready

Output from the UC864-E that indicates the

carrier presence

Output transmit line of UC864-E UART

Input receive of the UC864-E UART

Input to the UC864-E that controls the DTE

READY condition

GND

DSR

dsr_uart

5,6,7

Ground

Data Set Ready

Ground

Output from the UC864-E that indicates the

module is ready

RTS

rts_uart

CTS

cts_uart

ri_uart

Request to Send

Clear to Send

Ring Indicator

Input to the UC864-E that controls the

Hardware flow control

Output from the UC864-E that controls the

Hardware flow control

Output from the UC864-E that indicates the

incoming call condition

NOTE: According to V.24, RX/TX signal names are referred to the application side, therefore on

the UC864-E side these signal are on the opposite direction: TXD on the application side will be

connected to the receive line (here named TXD/ rx_uart ) of the UC864-E serial port and vice

versa for RX.

TIP: For a minimum implementation, only the TXD and RXD lines can be connected, the other

lines can be left open provided a software flow control is implemented.

page 31 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

8.2 RS232 level translation

In order to interface the Telit UC864-E with a PC com port or a RS232 (EIA/TIA-232) application a

level translator is required. This level translator must

Invert the electrical signal in both directions

Translate the level from 0/2.6V to +15/-15V

Actually, the RS232 UART 16450, 16550, 16650 & 16750 chipsets accept signals with lower levels on

the RS232 side (EIA/TIA-562), allowing for a lower voltage-multiplying ratio on the level translator.

Note that the negative signal voltage must be less than 0V and hence some sort of level translation is

always required.

The simplest way to translate the levels and invert the signal is by using a single chip level translator.

There are a multitude of them, differing in the number of driver and receiver and in the levels (be sure

to get a true RS232 level translator not a RS485 or other standards).

By convention the driver is the level translator from the 0-2.6V UART level to the RS232 level, while

the receiver is the translator from RS232 level to 0-2.6V UART.

In order to translate the whole set of control lines of the UART you will need:

•

5 drivers

3 receivers

NOTE: The digital input lines working at 2.6V CMOS have an absolute maximum input voltage

of 3.0V; therefore the level translator IC shall not be powered by the +3.8V supply of the

module. Instead it shall be powered from a +2.6V / +2.9 (dedicated) power supply.

This is because in this way the level translator IC outputs on the module side (i.e. UC864-E

inputs) will work at +3.8V interface levels, stressing the module inputs at its maximum input

voltage.

NOTE: In order to be able to do in circuit reprogramming of the UC864-E firmware, the serial

port on the Telit UC864-E shall be available for translation into RS232 and either it's

controlling device shall be placed into tristate, disconnected or as a gateway for the serial data

when module reprogramming occurs.

Only RXD, TXD, GND and the On/off module turn on pad are required to the reprogramming of

the module, the other lines are unused.

All applicator shall include in their design such a way of reprogramming UC864-E.

page 32 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

An example of level translation circuitry of this kind is:

The example is done with a SIPEX SP3282EB RS232 Transceiver that could accept supply voltages

lower than 3V DC.

NOTE: In this case Vin has to be set with a value compatible with the logic levels of the module

(Max 2.9V DC). In this configuration the SP3282EB will adhere to EIA/TIA-562 voltage levels

instead of RS232 (-5 +5V)

page 33 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

Second solution could be done using a MAXIM transceiver (MAX218)

In this case the compliance with RS232 (+-5V) is possible.

Another level adapting method could be done using a standard RS232 Transceiver (MAX3237EAI)

adding some resistors to adapt the levels on the UC864 Input lines.

NOTE: In this case has to be taken in account the length of the lines on the application to avoid

problems in case of High-speed rates on RS232.

The RS232 serial port lines are usually connected to a DB9 connector with the following layout:

page 34 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

5V UART level translation

If the OEM application uses a microcontroller with a serial port (UART) that works at a voltage different

from 2.6 – 2.9V, then a circuitry has to be provided to adapt the different levels of the two sets of

signals. As for the RS232 translation there are a multitude of single chip translators. For example a

possible translator circuit for a 5V TRANSMITTER/RECEIVER can be:

TO TELIT

MODULE

TIP: This logic IC for the level translator and 2.6V pull-ups (not the 5V one) can be powered directly from PWRMON

line of UC864-E. Note that the TC7SZ07AE has open drain output; therefore the resistor R2 is mandatory.

page 35 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

NOTE: The UART input line TXD (rx_uart) of UC864-E is NOT internally pulled up with a resistor, so there may be the

need to place an external 47KΩ pull-up resistor, either the DTR (dtr_uart) and RTS (rts_uart) input lines are not

pulled up internally, so an external pull-up resistor of 47KΩ may be required.

A power source of the internal interface voltage corresponding to the 2.6V CMOS high level is

available at the PWRMON pin on the connector, whose absolute maximum output current is 1mA.

A maximum of 9 resistors of 47 KΩ pull-up can be connected to the PWRMON pin, provided no other

devices are connected to it and the pulled-up lines are UC864-E input lines connected to open

collector outputs in order to avoid latch-up problems on UC864-E.

Care must be taken to avoid latch-up on UC864-E and the use of this output line to power electronic

devices shall be avoided, especially for devices that generate spikes and noise such as switching level

translators, micro controllers, failure in any of these condition can severely compromise the UC864-E

functionality.

NOTE: The input lines working at 2.6VCMOS can be pulled-up with 47KΩ resistors that can be connected directly to

the PWRMON line provided they are connected as in this example.

NO OTHER devices than those suggested should be powered with the PWRMON line; otherwise the module

functionality may be compromised.

It is important to consider that the added circuit must have consumption lower than 1mA.

In case of reprogramming of the module has to be considered the use of the RESET line to start correctly the

activity.

The preferable configuration is having an external supply for the buffer.

page 36 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

9 USB Port

UC864-E includes an integrated universal serial bus (USB) transceiver, compliant with USB 2.0

specification, for interfacing UC864-E to a computer as a USB peripheral or connecting the UC864-E

to other peripherals. It supports the USB low-speed (1.5 Mbits/s) and full-speed (12 Mb/s) modes. In

HSDPA (High Speed download Packet Access) mode, the downlink data speed rates up to 7.2Mbps.

Hence you need to interface UC864-E to your applications in full-speed (12Mbits/s) mode.

You can use USB for the following purposes: communication with external peripheral devices, debug

monitor

USB

Pin No.

Signal

UC864-E

Pad No.

Usage

USB_VBUS

Power supply for the internal USB transceiver. This pin is

configured as an analog input or an analog output depending

upon the type of peripheral device connected.

USB_D-

USB D+

USB_ID

Minus (-) line of the differential, bi-directional USB signal to/from

the peripheral device

Plus (+) line of the differential, bi-directional USB signal to/from

the peripheral device

Analog input used to sense whether a peripheral device is

connected, and determine the peripheral type, a host or a slave

NOTE: the UC864-E is turned fully on also by connecting the module’s USB port as slave (considering

also the presence of VBATT supply).

9.1 Communication ports combinations

The following port combinations are available on the UC864-E module:

•

UART (AT command) +USB (DATA/TRACE)

USB (AT command) + USB (DATA/TRACE)

page 37 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

10 Audio Section Overview

10.1 Generality

The UC864-E Audio Section provides two audio paths both in transmit and in receive sections, active

only one at time. Two buffering amplifiers could be used in Differential or Single Ended configuration.

To select the well-suited section, refer to paragraph 10.3 Selection mode.

For applications and suggestion refer to the Telit modules Audio Application Note (80000NT10007a)

10.2 Definitions

The Baseband chip was developed for the cellular phones, which needed a couple of amplifiers to be

used with internal audio transducers and another couple to be used with external ones , both in

transmit and in receive sections . Two different definitions were introduced to distinguish the

schematic signals and the Software identifiers, with the following meaning:

•

HS or MT Æ internal audio transducers (from HandSet or MicroTelephone )

HF Æ external audio transducers (from HandsFree )

We have not changed the HS and HF acronyms with UC864-E, keeping them both in the Software

and on the schematics. But we want you to remember that if you don’t have any load driving constraint

(like a speaker with an impedance coil lower than 16Ω) this distinction is not relevant, because the two

sections:

•

have fully equivalent electrical performances (like the two microphone amplifiers)

activate the same functionalities (like the Echo Canceller module)

offer slightly different performances (like the two speaker buffering stages)

Being the performances of the two blocks like the same in this case, the choice could be done as

example in order to overcome the PCB design difficulties, respecting the electrical characteristics.

10.3 Selection

The activation of the requested audio section is made Hardware by AXE line or Software by AT#CAP

command, turning on:

•

an output stage to drive a low resistive load earpiece and an input stage to drive the local

microphone when AUDIO-1 mode (HS/MT) ;

•

an output stage to drive a high resistive load headset and an input stage to drive the headset

microphone when AUDIO-2 mode (HF) .

page 38 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

10.4 Electrical Characteristics

10.4.1 Input lines (microphone)

The two transmit blocks are fully equivalent, connected in Differential mode

Line coupling

Line type

Coupling capacitor

AC (*)

Balanced

≥ 100nF

Differential input resistance 20kΩ

Differential input voltage

≤ 1,03V_pp@ HSMicG=0dB

Table 1. “Mic_MT” 1st differential microphone path

Line coupling

Line type

Coupling capacitor

AC (*)

Balanced

≥ 100nF

Differential input resistance 20kΩ

Differential input voltage

≤ 1,03V_pp@ HFMicG=0dB

Table 2. “Mic_HF” 2nd differential microphone path

Due to the fact that particular OEM applications need a single line connection, a Single Ended

configuration could be implemented, but halving the useful microphone signal.

In both cases the OEM circuitries shall be carefully designed to reduce the common mode noise

typically generated on the ground plane.

WARNING

In the previous tables, the line coupling definition AC (*) means that:

the signals from microphone must be connected to the input lines

of the UC864-E through CAPACITORS, not less than 100nF

Not respecting this constraint, the input stage will be damaged!

page 39 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

10.4.2 Output lines (speaker)

During designing, remember that while no difference could be if the amplifiers drive an external

amplifier, there are slightly different electrical performances when the load is driven directly from the

internal audio amplifiers, due to differential output voltage.

Line coupling

Line type

Differential

Output load resistance

Max. Load capacitance

Differential output impedance

Signal bandwidth

Differential output voltage @ 0dBm0

Number of volume steps

Volume level step

32 Ω

500pF(max)

1 Ω (max) @ 1.02KHz

150 - 4000 Hz @ -3 dB

1.06 V_rms(typical)

-2dB

Table 3. “Ear_MT” Buffers

Line coupling

Line type

Differential

Output load resistance

Max. load capacitance

Differential output resistance

Signal bandwidth

Differential output voltage @ 0dBm0

Number of volume steps

Volume level step

32 Ω

500pF(max)

1 Ω (max) @ 1.02KHz

150 - 4000 Hz @ -3 dB

833mV_rms(typical)

10 (SW)

-2dB

Table 4. “Ear_HF” Buffers

We suggest to drive the load differentially from both receive drivers, thus the output swing is doubled

and the need for the output coupling capacitor is eliminated. However for particular OEM application

needs also a Single Ended circuitry can be implemented, but reducing by four the output power.

The OEM circuitry shall be designed to reduce the common mode noise typically generated on the

ground plane and to get the maximum power output from the device (low traces resistance).

Audio amplifiers could be design in two configurations: balanced (or differential) and unbalanced (or

single-ended).

The differential output power amplifier configuration is also called BTL (bridge-tied load).

In the following a discussion about the use of the two input and output amplifier configurations will be

dealt with.

Also calculation and circuit examples will be exhaustively performed.

page 40 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

11 General Purpose I/O

The general-purpose I/O pads can be configured to act in three different ways:

•

Input

Output

Alternate function (internally controlled)

Input pads can only be read and report the digital value (high or low) present on the pad at the read

time; output pads can only be written or queried and set the value of the pad output; an alternate

function pad is internally controlled by the UC864-E firmware and acts depending on the function

implemented.

The following GPIO are available on the UC864-E module:

Input /

Signal

I/O

Function

Type

output

current

ON_OFF

state

Note

TGPIO_01

TGPIO_02

TGPIO_03

TGPIO_04

I/O GPIO01 Configurable GPIO

I/O GPIO02 Configurable GPIO

I/O GPIO03 Configurable GPIO

I/O GPIO04 Configurable GPIO

CMOS 2.6V 1uA / 1mA

pull up

pull down

Alternate

function

(RFTXMON)

Alternate

function

(ALARM)

Alternate

function

TGPIO_05

TGPIO_06

TGPIO_07

I/O GPIO05 Configurable GPIO

I/O GPIO06 Configurable GPIO

I/O GPIO07 Configurable GPIO

CMOS 2.6V 1uA / 1mA

pull down

pull up

pull down

(BUZZER)

TGPIO_08

TGPIO_09

TGPIO_10

TGPIO_11

TGPIO_12

TGPIO_13

TGPIO_14

TGPIO_15

TGPIO_16

TGPIO_17

TGPIO_18

TGPIO_19

TGPIO_20

TGPIO_21

I/O GPIO08 Configurable GPIO

I/O GPIO09 Configurable GPIO

I/O GPIO10 Configurable GPIO

I/O GPIO11 Configurable GPIO

I/O GPIO12 Configurable GPIO

I/O GPIO13 Configurable GPIO

I/O GPIO14 Configurable GPIO

I/O GPIO15 Configurable GPIO

I/O GPIO16 Configurable GPIO

I/O GPIO17 Configurable GPIO

I/O GPIO18 Configurable GPIO

I/O GPIO19 Configurable GPIO

I/O GPIO20 Configurable GPIO

I/O GPIO21 Configurable GPIO

CMOS 2.6V 1uA / 1mA

pull down

pull up

pull down

pull up

pull down

pull up

pull down

pull up

CMOS 1.8V

1uA / 1mA

TGPIO_22

I/O GPIO22 Configurable GPIO

(not 2.6V !!)

page 41 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

Not all GPIO pads support all these three modes:

•

GPIO5 supports all three modes and can be input, output, RFTX monitor output (Alternate

function)

•

GPIO6 supports all three modes and can be input, output, alarm output (Alternate function)

GPIO7 supports all three modes and can be input, output, buzzer output (Alternate function)

11.1 Logic level specifications

Where not specifically stated, all the interface circuits work at 2.6V CMOS logic levels.

The following table shows the logic level specifications used in the UC864-E interface circuits:

Absolute Maximum Ratings -Not Functional

UC864-E

Parameter

Min

Max

Input level on any

digital pin when on

Input voltage on

-0.3V

+3.0V

-0.3V

+3.0 V

analog pins when on

For 2.6V CMOS signals;

Operating Range - Interface levels

UC864-E

Level

Min

Max

Input high level

Input low level

Output high level

Output low level

2.0V

2.9 V

-0.3V

2.2V

0.6V

2.6V

0.35V

For 1.8V signals:

Operating Range - Interface levels (1.8V CMOS)

UC864-E

Level

Min

1.5V

-0.3V

1.4V

Max

2.1V

0.5V

1.8V

0.35V

Input high level

Input low level

Output high level

Output low level

page 42 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

11.2 Using a GPIO Pad as INPUT

The GPIO pads, when used as inputs, can be connected to a digital output of another device and

report its status, provided this device has interface levels compatible with the 2.6V CMOS levels of the

GPIO.

NOTE: If the digital output of the device to be connected with the GPIO input pad has interface levels

different from the 2.6V CMOS, it can be buffered with an open collector transistor, provided a 47KΩ

pull-up resistor is connected as seen in the paragraph 0

11.3 Using a GPIO Pad as OUTPUT

The GPIO pads, when used as outputs, can drive 2.6V CMOS digital devices or compatible hardware.

When set as outputs, the pads have a push-pull output and therefore the pull-up resistor may be

omitted.

11.4 Using the Alarm Output GPIO6

The GPIO6 pad, when configured as Alarm Output, is controlled by the UC864-E module and will rise

when the alarm starts and fall after the issue of a dedicated AT command.

This output can be used to power up the UC864-E controlling microcontroller or application at the

alarm time, giving you the possibility to program a timely system wake-up to achieve some periodic

actions and completely turn off either the application and the UC864-E during sleep periods,

dramatically reducing the sleep consumption to few μA.

In battery-powered devices this feature will greatly improve the autonomy of the device.

NOTE: During RESET the line is set to HIGH logic level.

page 43 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

11.5 Using the Buzzer Output GPIO7

The GPIO7 pad, when configured as Buzzer Output, is controlled by the UC864-E module and will

drive with appropriate square waves a Buzzer driver.

This permits to your application to easily implement Buzzer feature with ringing tones or melody

played at the call incoming, tone playing on SMS incoming or simply playing a tone or melody when

needed by your application.

A sample interface scheme is included below to give you an idea of how to interface a Buzzer to the

GPIO7:

NOTE: To correctly drive a buzzer a driver must be provided, its characteristics depend on the Buzzer and for them

refer to your buzzer vendor.

page 44 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

11.6 Indication of network service availability

The STAT_LED pin status shows information on the network service availability and Call status.

In the UC864-E modules, the STAT_LED usually needs an external transistor to drive an external

LED.

Therefore, the status indicated in the following table is reversed with respect to the pin status.

LED status

Device Status

Permanently off

Device off

Fast blinking

(Period 1s, Ton 0,5s)

Slow blinking

Net search / Not registered /

turning off

Registered full service

(Period 3s, Ton 0,3s)

Permanently on

a call is active

page 45 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

11.7 RTC Bypass out

The VRTC pin brings out the Real Time Clock supply, which is separate from the rest of the digital

part, allowing having only RTC going on when all the other parts of the device are off.

To this power output a backup capacitor can be added in order to increase the RTC autonomy during

power off of the battery.

Parameter

Symbol

Limit Values

typ.

Unit

min.

max.

Input Voltage

Input current, Xtal ON

VRTC

IRTC

1.50

3.0

3.25

1.1

NOTE: NO Devices must be powered from this pin.

11.8 VAUX1 power output

A regulated power supply output is provided in order to supply small devices from the module.

This output is active when the module is ON and goes OFF when the module is shut down.

The operating range characteristics of the supply are:

Operating Range – VAUX1 power supply

Min

Typical

Max

2.95V

100mA

2.2μF

Output voltage

2.75V

2.85V

Output current

Output bypass capacitor

NOTE: During RESET and POWER ON the VAUX line is OFF

page 46 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

11.9 Mounting UC864-E on your board

The position of the Molex board-to-board connector and the pin 1 are shown in the following picture.

NOTE: metal tabs present on UC864-E should be connected to GND

page 47 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

11.9.1 Debug of the UC864-E in production

To test and debug the mounting of the UC864-E, we strongly recommend to foreseen test pads on the

host PCB, in order to check the connection between the UC864-E itself and the application and to test

the performance of the module connecting it with an external computer.

Depending by the customer application, these pads include, but are not limited to the following signals:

•

TXD

RXD

ON/OFF

RESET

GND

VBATT

TX_TRACE

RX_TRACE

PWRMON

USB D+

USB D-

USB V_BUS

USB_ID

page 48 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

12 Conformity Assessment Issues

The UC864-E module is assessed to be conforming to the R&TTE Directive as stand-alone products,

so if the module is installed in conformance with Dai Telecom installation instructions require no

further evaluation under Article 3.2 of the R&TTE Directive and do not require further involvement of a

R&TTE Directive Notified Body for the final product.

In all other cases, or if the manufacturer of the final product is in doubt then the equipment integrating

the radio module must be assessed against Article 3.2 of the R&TTE Directive.

In all cases assessment of the final product must be made against the Essential requirements of the

R&TTE Directive Articles 3.1(a) and (b), safety and EMC respectively, and any relevant Article 3.3

requirements.

The UC864-E module is conforming to the following European Union Directives:

•

R&TTE Directive 1999/5/EC (Radio Equipment & Telecommunications Terminal Equipments)

Low Voltage Directive 73/23/EEC and product safety

Directive 89/336/EEC for conformity for EMC

In order to satisfy the essential requisite of the R&TTE 99/5/EC directive, the UC864-E module is

compliant with the following standards:

•

Radio Spectrum, Standard: EN 301 511 and 3GPP 51.010-1

EMC (Electromagnetic Compatibility). Standards: EN 301 489-1 and EN 301 489-7

LVD (Low Voltage Directive) Standards: EN 60 950

In this document and the Hardware User Guide, Software User Guide all the information you may

need for developing a product meeting the R&TTE Directive is included.

The UC864-E module is conforming to the following US Directives:

•

Use of RF Spectrum. Standards: FCC 47 Part 24 (GSM 1900)

EMC (Electromagnetic Compatibility). Standards: FCC47 Part 15

To meet the FCC's RF exposure rules and regulations:

The system antenna(s) used for this transmitter must be installed to provide a separation

distance of at least 20 cm from all the persons and must not be co-located or operating in

conjunction with any other antenna or transmitter.

The system antenna(s) used for this module must not exceed 3 dBi for mobile and fixed or mobile

operating configurations.

Users and installers must be provided with antenna installation instructions and transmitter

operating conditions for satisfying RF exposure compliance.

Manufacturers of mobile, fixed or portable devices incorporating this module are advised to clarify

any regulatory questions and to have their complete product tested and approved for FCC

compliance.

page 49 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

13 SAFETY RECOMMANDATIONS

READ CAREFULLY

Be sure the use of this product is allowed in the country and in the environment required. The use of

this product may be dangerous and has to be avoided in the following areas:

‰ Where it can interfere with other electronic devices in environments such as hospitals, airports,

aircrafts, etc.

‰ Where there is risk of explosion such as gasoline stations, oil refineries, etc.

It is responsibility of the user to enforce the country regulation and the specific environment regulation.

Do not disassemble the product; any mark of tampering will compromise the warranty validity.

We recommend following the instructions of the hardware user guides for a correct wiring of the

product. The product has to be supplied with a stabilized voltage source and the wiring has to be

conforming to the security and fire prevention regulations.

The product has to be handled with care, avoiding any contact with the pins because electrostatic

discharges may damage the product itself. Same cautions have to be taken for the SIM, checking

carefully the instruction for its use. Do not insert or remove the SIM when the product is in power

saving mode.

The system integrator is responsible of the functioning of the final product; therefore, care has to be

taken to the external components of the module, as well as of any project or installation issue,

because the risk of disturbing the GSM network or external devices or having impact on the security.

Should there be any doubt, please refer to the technical documentation and the regulations in force.

Every module has to be equipped with a proper antenna with specific characteristics. The antenna has

to be installed with care in order to avoid any interference with other electronic devices and has to

guarantee a minimum distance from the body (20 cm). In case of this requirement cannot be satisfied,

the system integrator has to assess the final product against the SAR regulation.

The European Community provides some Directives for the electronic equipments introduced on the

market. All the relevant information’s are available on the European Community website:

http://europa.eu.int/comm/enterprise/rtte/dir99-5.htm

The text of the Directive 99/05 regarding telecommunication equipments is available, while the

applicable Directives (Low Voltage and EMC) are available at:

http://europa.eu.int/comm/enterprise/electr_equipment/index_en.htm

page 50 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

UC864-E Hardware User Guide

1vv0300766a Rev.1 - 31/01/08

14 Document Change Log

Revision

Rev.0

Date

Changes

23/10/2007 Initial release

Rev.1

31/01/2008 3.1 – Pin 33 and 34 now Reserved

11.8 – VAUX is OFF during RESET and Power On period

Added table with power consumptions and Supply voltage range

page 51 of 51

Download from Www.Somanuals.com. All Manuals Search And Download.

Technicolor Thomson CRT Television 2 1 D U 2 1 C User Manual
Technicolor Thomson DVD Player D M51DVS User Manual
Thermador Dishwasher DWHD94BF User Manual
Toyota Weather Radio P0325 User Manual
TRENDnet Network Card TU S9 User Manual
TRENDnet Welding System 1000 Base SX LX User Manual
Triax Stereo Receiver DVB C1 User Manual
Uncle Milton Industries Indoor Furnishings 15077 User Manual
Uniden Cordless Telephone EXI916 User Manual
VistaQuest Digital Camera VQ3015 User Manual