Texas Instruments DAC161S997 User manual

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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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+
-
+
-
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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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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:

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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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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.

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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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4 Board Layout
Figure 10. Top Assembly Layer
Figure 11. Top Layer Routing

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Figure 12. Bottom Layer Routing