Texas Instruments LM95172EVM User manual

User’s Guide
September 2012
LM95172EVM User’s Guide
September 2012 LM95172EVM User’s Guide 1
LIST OF FIGURES............................................................................................................. 1 
LIST OF TABLES............................................................................................................... 1 
1.  INTRODUCTION ......................................................................................................... 1 
2.  SETUP......................................................................................................................... 2 
2.1.  INPUT/OUTPUT CONNECTOR DESCRIPTION..................................................... 2 
2.2.  SETUP...................................................................................................................... 4 
2.3.  SOFTWARE INSTALLATION.................................................................................. 5 
2.4.  OPERATION............................................................................................................. 8 
3.  BOARD LAYOUT...................................................................................................... 12 
4.  SCHEMATIC.............................................................................................................. 13 
EVALUATION BOARD/KIT/MODULE (EVM) ................................................................. 20 
LIST OF FIGURES
1 VDD IO Jumper Settings ........................................................................................... 2 
2 VDDA Analog Source Jumper Settings..................................................................... 2 
3 LM95172EVM Block Diagram.................................................................................... 4 
4 LM95172EVM............................................................................................................ 8 
5 LM95172EVM Layout Diagram................................................................................ 12 
6 LM95172EVM Schematic........................................................................................ 13 
LIST OF TABLES
1 Device and Package Configurations.......................................................................... 1
2 LM95172EVM Bill of Materials................................................................................. 13
1. Introduction
The LM95172EVM is used together with TI SensorEval software. The Texas Instruments LM95172EWG
evaluation module (EVM) helps designers learn about the operation, and evaluate the performance of the
LM95172EWG Temperature Sensor chip. The LM95172EVM is powered directly from the +5V line of the
USB connection. The microcontroller on the board provides the SPI (Serial Peripheral Interface) bus, and
relays the information from the LM95172EVM to the PC via the USB bus.
The EVM contains one Temperature Sensor (See Table 1).
Table 1: Device and Package Configurations

Setup
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TEMP SENSOR IC PACKAGE
U3 LM95172EWG 10-pin Cerpack
2. Setup
This section describes the jumpers and connectors on the EVM as well as how to properly connect, set up
the software and hardware, and use the LM95172EVM. There is no external power supply or signal sources
are required for operation of the LM95172EVM; however, there is an option allowing the use of external
power supply.
2.1. Input/Output Connector Description
J5 – Input is the power input terminal for the Temperature Sensor. The terminal header provides a power
(VDD IO). This header (IDD IO) can be used to insert the ammeter to measure current into VDD IO pin.
J6 – input is the VDD IO source for the LM95172EWG. The terminal header is two way jumpers. It can be
jumpered either pin 1-2 or 2-3 to use external power or a regulated internal supply +3.3V.
1 2 3
ExternalPower
Supply
InternalPower
Supply
1 2 3
Figure 1: VDD IO Jumper Settings
J7 – Input is the input terminal for the external power supply. Pin 1 of J7 is the external VDDA source. Pin 2
of J7 is the GND. Pin 3 of J7 is the external VDD IO source.
J8 – Input is the jumper used to enable VDD analog source. The terminal header is two way jumpers. It can
be jumpered either pin 1-2 or 2-3 (Figure 1) to use external power or a regulated internal supply +3.3V.
1 2 3
ExternalPower
Supply
InternalPower
Supply
1 2 3
Figure 2: VDDA Analog Source Jumper Settings
J9 – Input is the power input terminal for the VDDA analog source. The terminal header provides a power
(VDDA analog). This header (IDDA) can be used to insert the ammeter to measure current into VDDA pin.

Setup
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J10 – Output is the testpoint terminal. It provides user with signals for test purposes only. Please do not
apply any external power or signal to any of the pins on this header.

Setup
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2.2. Setup
The LM95172EVM along with the SensorEval software provides the designer with a convenient way to learn
about the operation of the EVM. The user simply installs the SensorEval software on the PC, connects the
USB cable from the PC to the EVM, connects the hardware setting, and it is ready to read the temperature. In
figure 3 is the block diagram that describes the EVM itself.
Figure 3: LM95172EVM Block Diagram

Setup
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2.3. Software Installation
To ensure that you are using the latest version of SensorEval software, you can download from our website
at http://www.ti.com/tool/sensoreval. You must install the SensorEval software, before you connect the
LM95172EVM to your PC.
To install the SensorEval Software:
•Click this link http://www.ti.com/tool/sensoreval then click on the red “download” button and click the
“Save” button to save the file to the known directory.
•To open the ZIP file you just download click on the “Open” button.

Setup
6 LM95172EVM User’s Guide September 2012
•Uncompress the file that you downloaded into a known directory, and run the
SensorEval_1.2.0_Setup.exe file.
•When you see the Welcome screen as shown below, follow the instructions by clicking the “Next”
button on the screen to install the software.
•When you finish the installation, please click “Finish” button.

Setup
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•Before you launch the SensorEval software, connect LM95172EVM device to one free USB port of
your PC. The “New Hardware” screen appears and click the “Next” button.
•A warning sign appears. Click “Continue Anyway” button.

Setup
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2.4. Operation
For proper operation of the LM95172EVM, J5, J6, J8 and J9 should be properly configured. The
recommended setting, using shorting blocks. If U3 of the LM95172EVM is not populated, Finger board must
be connected to J10. Fingerboard has a temperature range up to 200°C. One of the best features of this
board is that it allows user to insert the board itself into the high temperature.
For this quick start, connect the following jumpers:
1. J5 to short
2. J9 to short
3. J6 pin 2-3 to short
4. J8 pin 2-3 to short
Figure 4: LM95172EVM

Setup
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•Below snapshot is the overview of the setup.
•Align the polarity mark pin 1 of J10 with the ribbon cable alignment mark.

Setup
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•Also align the polarity mark of the ribbon cable alignment with pin 1 of the Fingerboard.
•Once the SensorEval software is installed, and the hardware is setup. You can launch them by
clicking the icon on the desktop. The dialog box appears to select the definition file of LM95172.