Texas Instruments DAC161S997 Manuel utilisateur

DAC161S997EVM

User's Guide

Literature Number: SNLU146A

June 2013–Revised February 2016

2SNLU146A–June 2013–Revised February 2016

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DAC161S997EVM

User's Guide

SNLU146A–June 2013–Revised February 2016

DAC161S997EVM

Topic ........................................................................................................................... Page

1 Introduction ........................................................................................................ 3

2 EVM Setup .......................................................................................................... 4

3 Software Installation............................................................................................. 4

4 Board Layout....................................................................................................... 9

5 Schematics........................................................................................................ 11

6 Bill of Materials.................................................................................................. 13

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Introduction

SNLU146A–June 2013–Revised February 2016

DAC161S997EVM

1 Introduction

The Texas Instruments DAC161S997EVM evaluation module (EVM) helps designers evaluate the

operation and performance of the DAC161S997 4-20mA Loop Drive with SPI control. The EVM contains a

low cost MSP430G2553 microcontroller which comes pre-loaded with firmware to communicate with the

Labview based PC Software. A JTAG header is provided which can be used to program custom firmware.

A general purpose header with SPI and microcontroller GPIOs is provided to ease development of sensor

transmitters and other applications.

The EVM contains one DAC161S997 and is configured as Loop-Powered 2-Wire Transmitter see Table 1.

Table 1. Device and Package Configurations

Converter IC Package

U2 DAC161S997 LLP-16

Figure 1.

PC DAC161S997EVM

Power

Supply

Ammeter

USB Loop-

Loop+

EVM Setup

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2 EVM Setup

This section describes the jumpers and connectors on the EVM as well and how to properly connect, set

up, and use the DAC161S997EVM.

2.1 Input/Output Connector Description

1. J1 : Loop Connector. Loop+ and Loop- Pins.

2. J2 : JTAG Connector. Used to debug/flash on-board MSP430G2553

3. J3 : General Purpose I/O. Can be used to connect to a SPI-based Analog front end such as the

LMP90100 from TI’s SensorAFE family.

4. DAC_CUR: Power supply for DAC161S997. Short Pin1 and Pin2 to power-up DAC.

5. ERRLVL_SEL1: Pin2 connected to MSP430 (GPIO P2.4) for software control of Error level signal.

6. ERRLVL_SEL2: Pin2 connected to ERRLV pin of DAC161S997. Pin1 connected to COM and Pin3

Connected to VDD.

7. HART_TX1: HART transmit input connector. Can be connected to an external HART modem output.

8. HART_RX1: HART receive output connector. Can be connected to an external HART modem input.

2.2 EVM Connections

For proper operation of the DAC161S997EVM, first short the DAC_CUR pins and connect jumper

between Pin1 and Pin2 of ERRLVL_SEL2 jumpers (the EVM is shipped in this configuration).

The EVM is powered through the Loop supply. Connect Loop+ pin of J1 to Positive of the supply and

negative of the supply to positive terminal of ammeter and negative terminal of ammeter to Loop- pins.

This configuration will supply power to EVM and can measure the Loop current.

Figure 2. EVM Connection Diagram

3 Software Installation

It is recommended to use the latest version of DAC161S997 software; this can be downloaded from:

http://www.ti.com/product/dac161s997. You must install the software before you connect the

DAC161S997EVM to your PC.

To install the DAC161S997EVM software:

• Direct a browser to http://www.ti.com/products/dac161s997, then scroll down to the Tools & Software

section to download the latest DAC161S997 software.

• Unzip the downloaded file from a known directory, and run the “setup.exe” in

/TI_DAC161S997_Installer/Volume/

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Software Installation

SNLU146A–June 2013–Revised February 2016

DAC161S997EVM

Figure 3.

• Click Next, read the license agreement and complete the first portion of the installation.

• Next, the FTDI drivers are installed automatically.

Figure 4.

• Click Extract and the following window will appear:

Software Installation

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DAC161S997EVM

Figure 5.

• Click Next. Once the drivers are installed a Completing the Device Driver Installation Wizard window.

Then, Click Finish to complete the installation.

Figure 6.

• Before you launch the DAC161S997 Software, Connect connect the DAC161S997EVM to a USB port

of your computer and connect the Loop supply voltage.

• Open the computer's "Device Manager" and verify that a new COM port named "USB Serial Port" has

been added in the Ports(COM&LPT) section.

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Software Installation

SNLU146A–June 2013–Revised February 2016

DAC161S997EVM

Figure 7.

• Make a note of the assigned COM port number; this number is needed to connect the PC to the

DAC161S997EVM.

• Run the DAC161S997 Software and select the COM port that was assigned and click on connect.

Figure 8.

• On start-up, the software retrieves all the DAC161S997 registers and updates the software

accordingly.

Software Installation

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DAC161S997EVM

Figure 9.

• The DAC output current can be set in the Current Output field, and the Error current levels can also be

set in the appropriate fields.

• Any error conditions are indicated and can be cleared when desired.

• Individual registers can be set directly if desired.

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Board Layout

SNLU146A–June 2013–Revised February 2016

DAC161S997EVM

4 Board Layout

Figure 10. Top Assembly Layer

Figure 11. Top Layer Routing

Board Layout

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DAC161S997EVM

Figure 12. Bottom Layer Routing

Table des matières

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