Texas Instruments TMP108EVM, User Manual, Page: 5 / 22

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Overview
5 SNIU036 – September 2019
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Copyright © 2019, Texas Instruments Incorporated
TMP108EVM User's Guide
1 Trademarks
All trademarks are the property of their respective owners.
2 Overview
The TMP108EVM allows users to evaluate the performance of the TMP108 digital temperature sensor.
The EVM comes in a USB stick form factor with an onboard MSP430F5528 microcontroller that interfaces
with both the host computer and the TMP108 device using an I2C interface. The module is designed with
perforations between the sensor and host controller on the EVM board. The perforation allows the user
flexibility in their evaluation:
• The user can connect the TMP108 to the user's system/host.
• The user can connect the EVM host and software to the user's system with TMP108 devices.
• Small individual boards allow the user to place sensors in the user's system.
• Hole spacing is compatible with common 0.1" prototyping breadboards.
2.1 EVM Kit Contents
Table 1 details the contents of the EVM kit. Contact the Texas Instruments Product Information Center
nearest you if any components are missing. TI highly recommends that users check the TI website at
http://www.ti.com to verify that they have the latest versions of the related software.
Table 1. EVM Kit Contents
Item Quantity
TMP108EVM 1
3 EVM Hardware
3.1 Perforations
The perforation between the USB controller and TMP108 sensor is labeled on both sides for pin
connections. image
3.2 Subregulator
The switch S1 enables and disables the on-board 1.8-V regulator U1. When the subregulator is enabled,
the green LED D3 illuminates. The subregulator must be enabled for normal operation of TMP108EVM.
3.3 Logic Level Translator
The translator U3 separates the MSP430 I2C host from the TMP108 device. This is not required for end
applications, but the translator is provided on the EVM as a courtesy. When the subregulator is disabled, a
voltage between 1.4 V and 3.6 V can be applied at the 1P8V net, which is the 1.8-V pin on the perforation.
This external voltage will illuminate the green LED D3 and power the TMP108 device.
3.4 Programming Header
The TMP108EVM comes pre-loaded with firmware that is necessary for the correct operation of the USB
interface and PC GUI software. The unpopulated header, J2, is provided for Spy-Bi-Wire access to the
MSP430F5528. TI does not recommend that users access this header or reprogram the device.
3.5 BSL Button
The TMP108EVM features push-button SW1 for entering USB BSL mode. This can be used for firmware
updates.