Texas Instruments TMP75BEVM User manual

TMP75BEVM
User's Guide
Literature Number: SNIU037
September 2019

2SNIU037–September 2019
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Table of Contents
Contents
1 Trademarks......................................................................................................................... 5
2 Overview ............................................................................................................................ 5
2.1 EVM Kit Contents ....................................................................................................... 5
3 EVM Hardware .................................................................................................................... 5
3.1 Perforations .............................................................................................................. 5
3.2 Subregulator ............................................................................................................. 5
3.3 Logic Level Translator .................................................................................................. 5
3.4 Programming Header ................................................................................................... 5
3.5 BSL Button ............................................................................................................... 5
4 Software Download ............................................................................................................. 6
4.1 Live Software on dev.ti.com ............................................................................................ 6
4.2 Offline Software .......................................................................................................... 6
5 Software ............................................................................................................................. 7
5.1 Home Tab ................................................................................................................ 7
5.2 Data Capture Tab ....................................................................................................... 8
5.3 Settings Tab .............................................................................................................. 9
5.4 Registers Tab ........................................................................................................... 10
5.5 Collateral Tab ........................................................................................................... 11
6 Schematic, Board Layout and Bill of Materials ...................................................................... 12
6.1 Schematic ............................................................................................................... 12
6.2 Printed-Circuit Board .................................................................................................. 13
6.3 Bill of Materials ......................................................................................................... 13

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List of Figures
List of Figures
1 Download Pop-Up ........................................................................................................... 6
2 Home.......................................................................................................................... 7
3 Data Capture ................................................................................................................. 8
4 Settings........................................................................................................................ 9
5 Registers .................................................................................................................... 10
6 Collateral .................................................................................................................... 11
7 Schematic ................................................................................................................... 12
8 Top View .................................................................................................................... 13
9 Bottom View ................................................................................................................ 13
List of Tables
1 EVM Kit Contents............................................................................................................ 5

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TMP75BEVM User's Guide
User's Guide
SNIU037–September 2019
TMP75BEVM User's Guide
This user's guide describes the characteristics, operation, and use of the TMP75BEVM evaluation board.
This user's guide discusses how to set up and configure the software, discusses the hardware, and
reviews various aspects of the software operation. Throughout this document, the terms evaluation board,
evaluation module, and EVM are synonymous with the TMP75BEVM. This user's guide also provides
information on the operating procedure, input and output connections, an electrical schematic, printed-
circuit board (PCB) layout drawings, and a parts list for the EVM.

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TMP75BEVM User's Guide
1 Trademarks
All trademarks are the property of their respective owners.
2 Overview
The TMP75BEVM allows users to evaluate the performance of the TMP75B 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 TMP75B 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 TMP75B to the user's system/host.
• The user can connect the EVM host and software to the user's system with TMP75B 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
TMP75BEVM 1
3 EVM Hardware
3.1 Perforations
The perforation between the USB controller and TMP75B sensor is labeled on both sides for pin
connections.
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 TMP75BEVM.
3.3 Logic Level Translator
The translator U3 separates the MSP430 I2C host from the TMP75B 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 TMP75B device.
3.4 Programming Header
The TMP75BEVM 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 TMP75BEVM features push-button SW1 for entering USB BSL mode. This can be used for firmware
updates.

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TMP75BEVM User's Guide
4 Software Download
The PC GUI Software for TMP75BEVM runs on TI's GUI Composer framework. The software is available
as a live version which runs in your browser, and it is available as a download for offline use. The software
is compatible with Windows, Mac, and Linux operating systems.
4.1 Live Software on dev.ti.com
The live software currently works on Chrome, Firefox, and Safari browsers. Internet Explorer is not
supported. Users can access the live version through one of the following actions:
• Go to the EVM tool page and click on the View button
• Go to dev.ti.com/gallery and search for TMP75BEVM
Click on the application icon within the gallery to launch the software. Click on the prompt to install the TI
Cloud Agent Bridge browser plugin.
4.2 Offline Software
4.2.1 Download from dev.ti.com
Users can access the latest version of the offline software by navigating to the live version as noted
above. Look for the download icon and download both the application and runtime for the operating
system as shown in the Gallery Download.
Figure 1. Download Pop-Up

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5 Software
5.1 Home Tab
The Home Tab is shown at software launch. The Learn More link displays Features and Functional
Diagram for the TMP75B device. The icons are shortcuts to the tabs shown on te left side of the screen.
Figure 2. Home

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5.2 Data Capture Tab
The Data Capture tab reports the temperature from the TMP75B device included on the TMP75BEVM. To
enable Data Capture, select an Auto Read setting at the top of the Registers tab.
Figure 3. Data Capture

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5.3 Settings Tab
The Settings tab provides the hardware configuration for the USB to I2C bridge and device features for the
TMP75B device.
Selecting the wrong Device I2C Address will cause the GUI to disconnect from the USB device. The
hardware must be modified at the TMP75B device to change the TMP75B's address. The link icon in the
bottom left corner indicates the current connection status, and the user can click on the area to change
the connection status.
If the user makes changes to the High Limit and Low Limit fields, this will trigger an immediate write to the
TMP75B's limit register if Immediate mode is enabled on the Registers tab.
The Send One Shot button will force a I2C write to the TMP75B's Configuration register with the OS bit
set to 1.
Figure 4. Settings

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5.4 Registers Tab
The Registers tab interacts with the registers and bits within the TMP75B device.
The Auto Read drop-down box configures polling of register contents. When Auto Read is Off, it is
necessary to click Read Register to fetch the contents of the current register. Read All Registers can be
used to fetch the contents of all registers at once. The Write Register button is greyed and disabled when
the drop-down next to the button is set to Immediate. Immediate mode triggers a Write operation each
time a register is modified. When Deferred mode is selected, the Write Register button is enabled, and
write operations will not be performed unless the Write Register button is clicked. These settings give the
user total control over I2C Bus activity, and enable individual transactions to be easily observed with an
oscilloscope, logic analyzer, or bus-sniffing device.
Figure 5. Registers