Texas Instruments TMP75BEVM Manuale utente

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

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

4SNIU037–September 2019

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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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Overview

SNIU037–September 2019

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.

Software Download

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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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Software

SNIU037–September 2019

TMP75BEVM User's Guide

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

Software

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TMP75BEVM User's Guide

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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Software

SNIU037–September 2019

TMP75BEVM User's Guide

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

Software

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TMP75BEVM User's Guide

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

Indice

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