National Computer Hardware LM95235 User Manual

Revision A  
April 14, 2006  
LM95235 Evaluation Board User’s Guide  
© Copyright 2006 National Semiconductor Corporation  
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LM95235 Evaluation Board User’s Guide  
References  
1. “LM95235 Precision Remote Diode Temperature Sensor With SMBus Interface and  
TruTherm™ Technology” datasheet.  
The latest copy of the LM95235 datasheet can be obtained by going to the National  
Semiconductor website www.national.com, by searching on “LM95235”, and then downloading  
the LM95235.pdf file.  
2. SensorEval Version 1.1.0a or later, Evaluation Board CD containing:  
a. The SensorEval.exe executable program used to run the LM95235 Evaluation  
Board.  
b. A softcopy of this User’s Guide  
c. A readme.txt file with useful information about the program.  
d. A softcopy of the SensorEval Software manual.  
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1.0 Introduction  
The LM95235 Evaluation Board is used together  
with the National Semiconductor SensorEval  
software (provided in the kit), and with a USB cable  
(not provided in the kit), and with an external  
personal computer (PC). Power to the LM95235  
Evaluation Board is provided by the +5 VDC line of  
the USB connection. No external power supply or  
signal sources are required for operation of the  
LM95235 evaluation board.  
The block diagram below describes the LM95235  
Evaluation Board itself. The USB input provides the  
+5.0 VDC power to the board, which is regulated  
down to 3.3 VDC to power the IC’s. The EEPROM  
is programmed at the factory with a unique ID code  
for this particular board. When the USB cable is  
plugged in, the PC interrogates the USB devices and  
can identify this device as the LM95235 Evaluation  
Board.  
Before connecting the PC to the LM95235  
The microcontroller on the board provides the serial  
SMBus clock (SMBCLK), provides the SMBus data  
(SMBDAT) signal, and relays the information from  
the LM95235 to the PC via the USB lines.  
evaluation board through the USB cable, the PC is  
first turned on and allowed to go through its boot-up  
procedure. The user installs and initiates the  
SensorEval software. See Section 4.0 for details.  
The block in the lower right of the Block Diagram  
shows the signals that are available to probe by the  
user for the LM95235 device on the board.  
After the SensorEval software is running, the user  
can connect the USB cable first to the computer and  
then to the LM95235 Evaluation Board.  
The PC should be able to recognize the board and  
the user simply selects the LM95235 Eval Board  
radio button.  
1.1Block Diagram  
USB D+  
USB  
USB D-  
Input  
SMBCLK  
EEPROM  
Microcontroller  
Circuit  
SMBDAT  
GND  
+5.0 VDC  
Circuitry  
GND  
+3.3 VDC  
Voltage  
Regulator  
Circuit  
VDD  
SMBCLK  
SMBDAT  
T_Crit  
U2  
LM95235  
OS/A0  
GND  
GND  
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2.0 Quick Start  
1. Install the CD into the CD drive of the computer  
and install the SensorEval software (see Section  
4.0).  
2. Hookup the USB cable between the PC or  
notebook computer and the LM95235EVAL  
board as shown in Quick Start Diagram (See  
Section 2.1).  
3. Run the SensorEval software clicking the icon  
on the desktop. The first screen after the  
installation will look like this:  
Select the LM95235 Evaluation Board.  
Click OK.  
5. The next screen will look like this:  
If not, select “Another Device”. The next screen  
should look like this:  
Make sure that “4C” is selected in the upper left  
box labeled “I2C Addr”. Select “All Regs” in the  
“Read Cont” box to read all of the registers,  
including the temperature registers continuously.  
Select LM95235 and click on Open button.  
4. The next screen (first screen after the first run of  
the program) will look like this:  
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6.  
The Screen should look like this:  
.
The user can also select the 3904 diode or the  
processor thermal diode called “90 nm”.  
Local (on-chip) and remote temperatures should read  
continuously. The user can experiment with the  
different settings of Address BF.  
7. If the user clicks the 06-FF tab the next screen  
will look like this:  
The user can experiment with the Mask settings. Also the  
user can change the conversion rate. The next screen  
shows the possibilities for the Conversion Rate.  
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8. If the user clicks on the Start Plot button a graph  
box will appear and will graph the temperature. An  
example is shown below  
9. If the user selects the Start Log button the following  
screen will appear. The user then enters the filename that  
he chooses to log the data into.  
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2.1 Quick Start Diagram  
Important! NO EXTERNAL POWER SUPPLY OR SIGNAL INPUTS ARE REQUIRED!  
N/C  
TCRIT#  
N/C  
USB Cable to  
Computer  
OS/A0  
SCL  
SDA  
+3.3  
JP2  
LM95235  
Computer  
with  
SensorEval  
software  
loaded  
National Semiconductor  
LM95235 Evaluation Board Rev. 1  
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Power to the LM95235 Evaluation Board is taken  
from the USB 5-Volt line. This +5 VDC is the input  
to the on-board LM2950 low dropout voltage  
regulator, which regulates the output voltage to +3.3  
VDC. This output voltage powers the LM95235, the  
on-board microcontroller, and the EEPROM chip  
where the board ID information is stored.  
3.0 Functional Description  
The LM95235 Evaluation Board, along with the  
SensorEval Software, provides the system designer  
with a convenient way to learn about the operation of  
the LM95235 Temperature Sensor chip. The user  
simply has to install the SensorEval software on his  
PC, run it, connect the USB cable from the PC to the  
Evaluation Board, and the user can read the  
temperatures. It’s that simple! The user doesn’t have  
to provide any power or external signals to the  
evaluation board.  
The microcontroller provides the SMBus Clock  
(SMBCLK) signal and the SMBus Data (SMBDAT)  
signal to the LM95235 chip. This communication  
between the LM95235 and the PC USB data lines is  
controlled by the microcontroller. For all of the  
details of this communication protocol see the latest  
3.1 LM95235 Evaluation Board Connection Table  
Connector Label  
Pin  
Description  
Number  
USB Cable Input. Connect the USB cable to this jack after  
the SensorEval software has been loaded on the PC.  
J1  
N/A  
1
VDD. The +3.3 VDC voltage supplied by the on-board  
voltage regulator to the LM95235 VDD input pin. Do not  
connect an external power supply to this pin!  
2
3
SMBDAT. Data signal for the SMBus.  
JP2  
Output header provides  
user with signals for test  
purposes only.  
SMBCLK. Clock signal for SMBus.  
OS#/A0. When this pin is pulled low it enables the  
Overtemperature Shutdown (OS) feature. When this pin is  
pulled high it is the Address pin function.  
Do not apply any  
4
external power or  
signals to any of the  
pins on these headers!  
5
6
7
No Connection.  
T_Crit#. This is the signal that goes low when the Set  
Temperature is exceeded.  
No Connection.  
J4  
Connection to  
3, 4  
1, 2  
Connect for D+ connection  
temperature diodes  
Do not apply any  
external power or  
signals to any of the  
pins on these headers!  
Connect for D- connection  
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4.0 Software Installation and Operation  
4.1 Installation  
4.2 Operation  
The CD provided in the LM95235 Evaluation Board Kit  
contains the SensorEval software used to make the LM95235  
Evaluation Board operate with the user’s PC. It is assumed  
that the user will be using a PC with a Pentium® III or higher  
processor and Microsoft Windows® XP/2000/98/ME  
operating system.  
Follow the following procedure for operation the LM95235  
Evaluation Board using the SensorEval software:  
1. Run the SensorEval program by either double-  
clicking on the icon on the desktop or by selecting  
Start, Program Files, National Semiconductor,  
SensorEval.  
2. Plug in the USB cable on both the PC and the  
LM95235 Evaluation Board.  
The software is installed as follows:  
1. Insert the SensorEval CD into the CD drive of the  
PC. See details in the readme.txt file.  
2. The software manual, provided on the CD, may be  
useful to the user during this process.  
Follow the register setup steps given in section 2.0 Quick Start  
of this User’s Guide. Make sure that you are following the  
given procedure for the specific evaluation board you are  
working with.  
3. Follow all of the Installation instructions in the  
windows as the SensorEval software is installing.  
4. The installation process will put an icon on the PC  
desktop so that the SensorEval program will run  
when the icon is double-clicked.  
Refer to the electrical schematic, layout and connector  
diagrams for proper connections to external remote thermal  
diodes.  
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5.0 Electrical and Mechanical Specifications  
5.1 Electrical Specifications  
Power Requirements  
The Board uses the +5.0 VDC and GND lines from the USB connection.  
This +5.0 VDC voltage is regulated down to +3.3 VDC for board power.  
* NO EXTERNAL POWER SUPPLY INPUTS ARE REQUIRED *  
+5.0 ± 0.1 V,  
100 mA max.  
5.2 Electrical Schematic  
+ 3.3 VDC  
TP1  
GND  
Use a 0.1 uF capacitor for each  
Vcc pin of U2 and Reserved_6 pin.  
+ 3.3 VDC  
C1  
0.1uF  
C2  
0.1uF  
C3  
0.1uF  
C4  
0.1uF  
C5  
0.1uF  
C6  
0.1uF  
R1  
0
+ 3.3 VDC  
TP2  
GND  
U1  
Y1  
12 MHz  
LP2950CDT-3.3/TO252  
1
3
C9  
33pF  
C10  
33pF  
IN  
OUT  
GND  
R4  
1M  
C11  
C12  
C13  
R2  
1.5K  
L1  
R3  
100k  
R15  
2.2uF  
0.1uF  
100 pF  
1.5K  
1 uH  
C14  
2.2uF  
C15  
0.1uF  
C16  
2.2uF  
C17  
0.1uF  
TP3  
GND  
JP2  
1
C18  
0.1uF  
Q1  
LM95235  
SMBCLK  
+3.3 VDC  
SCL  
U3  
MMBT3904/SOT  
J3  
USB-B  
J4  
HEADER 2x2  
1
8
7
6
5
SCL  
SDA  
VDD  
D+  
3
2
4
5
6
7
28  
24  
25  
18  
RESET#  
USBD-  
1
2
35  
4
2
3
1
C19  
100 pF  
2
3
4
SDA  
VBUS  
PB6/INT6  
PB7/T2OUT  
CTL2/AOUTFLAG  
CTL0/AINFLAG  
PC0/RxD0  
SMBDAT  
OS/A0  
GND  
R7 22  
R9 22  
R11 1.5K  
36  
37  
41  
43  
44  
OS/A0  
OS/A0  
D-  
D-  
Shunt to select the PCB  
temperature diode.  
TCRIT#  
3
D+  
USBD+  
PC1/TxD0  
TCRIT  
TCRIT  
OS/A0  
4
5
6
45  
GND  
SHELL_1  
SHELL_2  
PC2/INT0#  
PC3/INT1#  
U2  
DISCON#  
46  
HEADER 1X7  
CY7C64603-52NC  
+ 3.3 VDC  
10  
11  
12  
PA4/FWR#  
PA5/FRD#  
CLKOUT  
R12  
48  
49  
50  
51  
TP4  
GND  
PC4/T0  
PC5/T1  
PC6/WR#  
PC7/RD#  
1M  
U4  
AT24C02-10SI-2.7  
1
8
7
6
5
R13  
1.5K  
R14  
1.5K  
C20  
0.1uF  
A0  
Vcc  
WP  
2
A1  
SCL  
SDA  
3
2
3
A2  
SCL  
SDA  
SCL  
SDA  
4
Vss  
SCL  
SDA  
Schematic of the LM95235 Evaluation Board  
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5.3 Evaluation Board Layout  
Figure 5.3 Layout diagram of the LM95235 Evaluation Board  
(Note: socket and socket area not stuffed.)  
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5.4 Bill of Materials for LM95235 Evaluation Board  
Item  
Qty  
Reference  
Part  
PCB Footprint  
1
11  
C1,C2,C3,C4,C5,C6,  
Capacitor, SMD, ceramic, 0.1uF  
sm/c_0805  
C12,C15,C17,C20  
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
2
3
2
1
1
1
1
1
2
2
5
1
1
1
1
1
1
C9, C10  
C11,C14,C16  
Capacitor, SMD, ceramic, 33 pF  
Capacitor, SMD, ceramic, 2.2 uF  
Capacitor, SMD, ceramic, 100 pF  
Connector, USB-B  
sm/c_0805  
sm/ct_3216_12  
sm/c_0805  
C13,C19  
J3  
J4  
L1  
Q1  
tm/usb_typeb  
blkcon.100/vh/tm1sqs/w.100/4  
sm/l_1206  
HEADER 2x2  
Filter, 1uH, Stewart MI1206K900R-00  
Transistor, SMD, MMBT3904/SOT  
Resistor, SMD, 0 Ohms  
sm/mmbt3904a  
sm/r_0805  
R1  
R4,R12  
R7,R9  
R2,R11,R13,R14,R15  
Resistor, SMD, 1M  
Resistor, SMD, 22 Ohms  
Resistor, SMD, 1.5K  
sm/r_0805  
sm/r_0805  
sm/r_0805  
sm/r_0805  
R3  
U1  
U2  
U4  
U3  
Y1  
Resistor, SMD, 100k Ohms  
IC, National LP2950CDT-3.3/TO252  
IC, Cypress CY7C64613-52NC  
IC, EPROM, Atmel AT24C02-10SI-2.7  
LM95235CIMM  
to252ab/dpak  
sm/PQFP-52  
sog.050/8/wg.244/l.200  
sm/msop-8  
Crystal, 12 MHz, Pletronics  
2S1200G140  
tm/hc-49  
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5.4 Mechanical Specifications  
5.4.1 Operating Mechanical and Environmental Specifications  
Minimum  
Typical  
Maximum  
Temperature  
0°C  
25°C  
70°C  
5.4.2 Evaluation Board Basic Dimensions  
2.45 in/6.22 cm  
3.25 in/8.76 cm  
5.4.3 Electrostatic Discharge (ESD) Precautions  
The user shall use ESD precautions as specified in National Semiconductor ESD control document  
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BY USING THIS PRODUCT, YOU ARE AGREEING TO BE BOUND BY THE TERMS AND CONDITIONS OF  
NATIONAL SEMICONDUCTOR'S END USER LICENSE AGREEMENT. DO NOT USE THIS PRODUCT UNTIL YOU  
HAVE READ AND AGREED TO THE TERMS AND CONDITIONS OF THAT AGREEMENT. IF YOU DO NOT AGREE  
WITH THEM, CONTACT THE VENDOR WITHIN TEN (10) DAYS OF RECEIPT FOR INSTRUCTIONS ON RETURN OF  
THE UNUSED PRODUCT FOR A REFUND OF THE PURCHASE PRICE PAID, IF ANY.  
The LM95235 Evaluation Boards are intended for product evaluation purposes only and are not  
intended for resale to end consumers, are not authorized for such use and are not designed for  
compliance with European EMC Directive 89/336/EEC, or for compliance with any other  
electromagnetic compatibility requirements.  
National Semiconductor Corporation does not assume any responsibility for use of any circuitry or  
software supplied or described. No circuit patent licenses are implied.  
LIFE SUPPORT POLICY  
NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN  
LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF  
THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:  
1. Life support devices or systems are devices  
or systems which, (a) are intended for  
surgical implant into the body, or (b)  
support or sustain life, and whose failure to  
perform, when properly used in accordance  
with instructions for use provided in the  
labeling, can be reasonably expected to  
result in a significant injury to the user.  
2. A critical component is any component in a  
life support device or system whose failure to  
perform can be reasonably expected to cause  
the failure of the life support device or system,  
or to affect its safety or effectiveness.  
BANNED SUBSTANCE COMPLIANCE  
National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products  
Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-  
111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2.  
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National does not assume any responsibility for any circuitry described, no circuit patent licenses are implied and National  
reserves the right at any time without notice to change said circuitry and specifications.  
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