Texas Instruments BOOST-DAC8730-HART User manual

1
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BOOST-DAC8730-HART Evaluation Module
User's Guide
SLAU699–May 2017
BOOST-DAC8730-HART Evaluation Module
This user's guide describes the characteristics, operation, and use of the BOOST-DAC8730-HART
evaluation board. This user’s guide also discusses the proper setup and configuration of both software
and hardware, and reviews various aspects of program operation. A complete circuit description,
schematic diagram, and bill of materials (BOM) are also included in this document.
spacer
Contents
1 Overview...................................................................................................................... 2
1.1 BOOST-DAC8730-HART Kit Contents .......................................................................... 2
1.2 Related Documentation From Texas Instruments.............................................................. 2
2 BOOST-DAC8730-HART Hardware Setup............................................................................... 3
2.1 Theory of Operation for BOOST-DAC8730-HART Hardware................................................. 3
2.2 MSP430FR5969 LaunchPad™ Connections ................................................................... 4
3 BOOST-DAC8730-HART Software Setup................................................................................ 5
3.1 Operating Systems for BOOST-DAC8730-HART Software................................................... 5
3.2 BOOST-DAC8730-HART Software Installation................................................................. 5
3.3 Installing Drivers and MSP430FR5969 LaunchPad™ Firmware............................................. 6
4 BOOST-DAC8730-HART Hardware Overview .......................................................................... 7
4.1 Electrostatic Discharge Warning.................................................................................. 7
4.2 Connecting the BOOST-DAC8730-HART....................................................................... 7
4.3 BOOST-DAC8730-HART Power Configurations ............................................................... 8
4.4 SPI Communication Signals and Digital Inputs/Outputs....................................................... 8
5 BOOST-DAC8730-HART Software Overview ........................................................................... 9
5.1 Starting the BOOST-DAC8730-HART Software................................................................ 9
5.2 BOOST-DAC8730-HART Software Features ................................................................... 9
6 BOOST-DAC8730-HART Documentation............................................................................... 13
6.1 BOOST-DAC8730-HART Board Schematic................................................................... 13
6.2 BOOST-DAC8730-HART PCB Components Layout ......................................................... 14
6.3 BOOST-DAC8730-HART Test Board Bill of Materials ....................................................... 15
List of Figures
1 BOOST-DAC8730-HART Hardware Setup............................................................................... 3
2 BOOST-DAC8730-HART Test Board Block Diagram .................................................................. 3
3 MSP430FR5969 LaunchPad™ Header .................................................................................. 4
4 BOOST-DAC8730-HART Installer Directory............................................................................. 5
5 BOOST-DAC8730-HART Install Path..................................................................................... 5
6 Install MSP430 Drivers Button............................................................................................. 6
7 Typical Hardware Connections on the BOOST-DAC8730-HART..................................................... 7
8 BOOST-DAC8730-HART GUI Location .................................................................................. 9
9 BOOST-DAC8730-HART GUI – Power On ............................................................................. 9
10 Low Level Configuration Page............................................................................................ 10
11 Low Level Configuration Page Available Options...................................................................... 10
12 High Level Configuration Page........................................................................................... 11
13 BOOST-DAC8730-HART Board Schematic............................................................................ 13

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14 BOOST-DAC8730-HART PCB Components Layout .................................................................. 14
List of Tables
1 Contents of BOOST-DAC8730-HART Kit ................................................................................ 2
2 Related Documentation..................................................................................................... 2
3 MSP430FR5969 LaunchPad™ Header .................................................................................. 4
4 Default Jumper Settings .................................................................................................... 7
5 BOOST-DAC8730-HART Power Supply Configuration................................................................. 8
6 Digital Block Signal Definition.............................................................................................. 8
7 UART Command Byte..................................................................................................... 12
8 BOOST-DAC8730-HART Test Board Bill of Materials ................................................................ 15
Trademarks
LaunchPad is a trademark of Texas Instruments.
Microsoft, Windows are registered trademarks of Microsoft Corporation.
All other trademarks are the property of their respective owners.
1 Overview
The DAC8730 integrates several components in creating a smart-loop-powered sensor transmitter with
included Highway Addressable Remote Transducer (HART), FOUNDATION Fieldbus (FF), and Profibus
PA (PA) modems. The key components of the device include a 16-bit PWM DAC, loop-control operation
amplifier, HART or FF/PA modem, internal reference and power tree.
1.1 BOOST-DAC8730-HART Kit Contents
Table 1 details the contents of the kit. Contact the TI Product Information Center or visit the Texas
Instruments E2E Community (http://E2E.ti.com) if any component is missing.
Table 1. Contents of BOOST-DAC8730-HART Kit
Item Quantity
BOOST-DAC8730-HART PCB evaluation board 1
1.2 Related Documentation From Texas Instruments
The following document provides information regarding Texas Instruments integrated circuits used in the
assembly of the BOOST-DAC8730-HART. This user's guide is available from the TI web site under
literature number SLAU699. Any letter appended to the literature number corresponds to the document
revision that is current at the time of the writing of this document. Newer revisions may be available from
the TI web site at http://www.ti.com/, or call the Texas Instruments Literature Response Center at (800)
477-8924 or the Product Information Center at [phone]. When ordering, identify the document by
both title and literature number.
Table 2. Related Documentation
Document Literature Number
BOOST-DAC8730-HART Product Data Sheet SLASEH8

DAC8730
Ext Power
External Passive/
Active
Conditioning
Block
MSP430 LaunchPadŒConnector
+
±
250 
J5
Terminal
Block
LOOP+
LOOP-
J1 Digital Header
MSP430FR5969
LP
Power
COM
Copyright © 2017, Texas Instruments Incorporated
BOOST-
DAC8730-HART
USB Bus
from
Computer
External Power
Source
LaunchPad
Connector
MSP430FR5969
LP
Personal
Computer
(PC)
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2 BOOST-DAC8730-HART Hardware Setup
This section provides the overall system setup for the BOOST-DAC8730-HART Booster Pack. The
Booster Pack can be evaluated standalone – with any SPI- or UART-capable microcontroller – or with the
MSP430FR5969 LaunchPad™. The software provides installation steps to install the necessary
LaunchPad drivers, and MSP430FR5969 firmware. Additionally, the Graphical User Interface (GUI)
provides an interactive interface that syncs communication between the MSP430FR5969 LaunchPad and
DAC8730 device. The hardware (BOOST-DAC8730-HART and MSP430FR5969LP) is powered externally
via the loop connections of the BOOST-DAC8730-HART J2 terminal block. Figure 1 displays the system
setup for the BOOST-DAC8730-HART.
Figure 1. BOOST-DAC8730-HART Hardware Setup
2.1 Theory of Operation for BOOST-DAC8730-HART Hardware
A block diagram of the BOOST-DAC8730-HART board is displayed in Figure 2. The board provides an
external terminal block (J2) for the supplies, and a digital header connection (J1) that enables connection
to the DAC8730 digital pins. Once powered, the DAC8730 outputs a voltage that powers the
MSP430FR5969 LaunchPad. The BOOST-DAC8730-HART includes a diode bridge and protection circuit
that is tied to the J2 terminal block. This protection allows any polarity of power into the J2 terminal block.
Figure 2. BOOST-DAC8730-HART Test Board Block Diagram

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2.2 MSP430FR5969 LaunchPad™ Connections
Before connecting the LaunchPad to the BOOST-DAC8730-HART board, the following MSP430FR5969
LaunchPad (J13) jumpers must be set to the configuration shown in Table 3.
WARNING
If the jumper connections are not configured as in Table 3, the
BOOST-DAC8730-HART and MSP430FR5969 will receive damage
from the USB supply connection.
Table 3. MSP430FR5969 LaunchPad™ Header
PIN on J13 Signal Shunt position
20 GND Connected
18 5 V Open
16 V+ Open
14 RTS Open
12 CTS Open
10 RXD Connected
8 TXD Connected
6 RST Connected
4 TST Connected
Figure 3. MSP430FR5969 LaunchPad™ Header

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3 BOOST-DAC8730-HART Software Setup
This section provides the procedures for software installation.
3.1 Operating Systems for BOOST-DAC8730-HART Software
The software has been tested on the Microsoft®Windows®XP and Windows 7 operating systems with the
United States and European regional settings. The software should also be compatible with other
Windows operating systems.
3.2 BOOST-DAC8730-HART Software Installation
The software is available through the product folder on the TI website. Once the software is downloaded
onto the PC, navigate to the BOOST-DAC8730-HART folder, and run the Setup.exe file, as shown in
Figure 4. When the software is launched, an installation dialog will open, and prompt the user to select an
installation directory. If left unchanged, the software location defaults to C:\Program Files (x86)\Texas
Instruments\BOOST-DAC8730-HART, as shown in Figure 5.
Figure 4. BOOST-DAC8730-HART Installer Directory
Figure 5. BOOST-DAC8730-HART Install Path

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3.3 Installing Drivers and MSP430FR5969 LaunchPad™ Firmware
Before connecting the BOOST-DAC8730-HART board to the MSP430FR5969 LaunchPad, the user must
ensure that the MSP430 device drivers are installed on the PC, and that the firmware is flashed on the
MSP430FR5969 LaunchPad.
Driver installation is accomplished by invoking the GUI before any hardware is connected to the PC. In
this step, ensure that no hardware is connected to the PC. To invoke the GUI, click the “BOOST-
DAC8730-HART” icon found in the programs or apps section of the start menu. The GUI will display a
splash screen and a pop-up displaying “No MSP LaunchPad Found”. Press the OK button, and the GUI
will start in DEMO mode. Navigate to the DAC8730 page by pressing the “DAC8730” tab under the Pages
field and press the Install MSP430 Drivers button, as shown in Figure 6.
Figure 6. Install MSP430 Drivers Button
Once pressed, a batch file will execute from the software and install the necessary files. Several prompts
may appear that query the user to accept software changes made by the application. Press the Continue
button to proceed with the installation. The next step is to connect the MSP430FR5969 LaunchPad to the
PC (without BOOST-DAC8730-HART) via the micro USB cable. Now press the Install MSP430 Firmware
button of the GUI to flash custom firmware to the MSP430FR5969 LaunchPad. The LEDs of the
LaunchPad will begin to flash, and a black window may appear during the firmware installation.
Additionally, the text field next to the Install MSP430 Firmware should read as “UPLOADING”. When
flashing is complete, the cmd prompt will exit, and the text field will update to display “COMPLETE”. The
MSP430FR5969 LaunchPad has now been successfully flashed.
Now close the GUI by pressing the exit Xbutton located on the top right of the GUI page, and disconnect
the LaunchPad USB cable from the PC.

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4 BOOST-DAC8730-HART Hardware Overview
The subsequent sections provide detailed information on the hardware, and jumper configuration settings.
Table 4 displays the default configurations of all jumper connections on the BOOST-DAC8730-HART.
Table 4. Default Jumper Settings
Jumper Default Position Description
JP1 Shunt on 1-2 Configures the VCCIO output voltage 00 = 1.8 V, 01 = 2.5 V, 10 = 3.0
V, 11 = 3.15 V (Default setting: 3.15 V)
JP2 Shunt on 1-2
JP3 Shunt on 2-3 Connect to GND for operation with crystal, connect to VINL for
operation with resonator (Default setting: GND)
4.1 Electrostatic Discharge Warning
Many of the components on the BOOST-DAC8730-HART are susceptible to damage by electrostatic
discharge (ESD). Customers are advised to observe proper ESD handling precautions when unpacking
and handling the board, including the use of a grounded wrist strap at an approved ESD workstation.
4.2 Connecting the BOOST-DAC8730-HART
To connect the BOOST-DAC8730-HART to the MSP430FR5969 LaunchPad, align and firmly connect the
LaunchPad connectors to the BOOST-DAC8730-HART J3 and J4 female headers. The booster pack
connects to the pins on the outermost column of the MSP430FR5969 LaunchPad connectors, and care
must be taken to align J3 and J4 of the DAC8730 board to the MSP430FR5969 LaunchPad. The
alignment of the connection is shown in Figure 7, with green boxes surrounding the electrical points of
contact.
Figure 7. Typical Hardware Connections on the BOOST-DAC8730-HART

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4.3 BOOST-DAC8730-HART Power Configurations
The BOOST-DAC8730-HART provides a terminal block (J2) to connect to the external loop-supply. A
typical two-wire connection has a sense resistor tied to either the negative or positive node of the external
supply. A minimum loop resistance value of 250 ohms is commonly required for HART communication.
The minimum voltage for DAC8730 device operation and other parameter requirements are listed in the
DAC8730 data sheet (SLASEH8). For correct loop operation, please be aware that the loop-supply
voltage must exceed the sum of both the minimum voltage requirement of the DAC8730 device, and the
IR drop across the sense resistor.
Table 5. BOOST-DAC8730-HART Power Supply Configuration
Connector Connection Type Description
J2 Terminal block External loop-supply connection
A loop-supply voltage of 24 V is the nominal supply voltage for most 4- to 20-mA two-wire transmitters.
4.4 SPI Communication Signals and Digital Inputs/Outputs
The SPI signals are located on the J2 header and are described in Table 6, along with the digital input
signals of the BOOST-DAC8730-HART device.
Table 6. Digital Block Signal Definition
Name Connector Description
GND J2-1 Local GND
DS1 J2-2 Power transformer driver (driven from the REG_IN pins)
DS2 J2-3
VCCIO J2-4 External supply output
CLKOUT J2-5 Clock output
RESET J2-6 Hardware reset
CS J2-7 SPI chip select
MOSI J2-8 SPI data input
MISO J2-9 SPI data output
SCLK J2-10 SPI clock input
RX J2-11 UART RX input
TX J2-12 UART TX output
IRQ J2-13 Interrupt request output (active low)
GND J2-14 Local GND
VSHUNT J2-15 Internal DC/DC voltage FB_SUPPLY
VINL J2-16 Synchronous DAC load control input

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5 BOOST-DAC8730-HART Software Overview
This section discusses how to use the BOOST-DAC8730-HART software.
5.1 Starting the BOOST-DAC8730-HART Software
Once the hardware connections are established and jumper settings configured, power on the BOOST-
DAC8730-HART with the loop-supply voltage. Next, launch the software located in the Texas Instruments
folder of the Start All Programs menu, and select the BOOST-DAC8730-HART icon.
Figure 8. BOOST-DAC8730-HART GUI Location
If the LaunchPad is properly connected to the BOOST-DAC8730-HART, the GUI should automatically
display "HARDWARE CONNECTED" on the lower left of the GUI, as seen in Figure 9.
Figure 9. BOOST-DAC8730-HART GUI – Power On
If the LaunchPad has a faulty connection, or is not connected at all, the GUI will launch in DEMO mode. If
this text appears while the LaunchPad device is connected, then power off the loop-supply voltage, unplug
the LaunchPad, and close the GUI. Reconnect the LaunchPad and ensure that the connectors are
correctly aligned. After this, verify the USB extender cable is properly connected to both the LaunchPad
and PC. Reapply the loop-supply voltage and re-launch the GUI. This issue can also occur if the MSP430
driver is installed incorrectly, and so the BOOST-DAC8730-HART software may need to be reinstalled.
5.2 BOOST-DAC8730-HART Software Features
The following subsections describe the functionality of each page of the BOOST-DAC8730-HART GUI.
5.2.1 BOOST-DAC8730-HART Low Level Configuration Page
The BOOST-DAC8730-HART features a Register Map page that allows access to low-level
communication by directly writing to and reading from the registers of the BOOST-DAC8730-HART.
Selecting a register on the Register Map list will present a description of the values in that register, and
also display register information such as the address, default value, size, and current value. The register
values can be modified by either writing directly to the value column or selecting the bit individually. This is
shown in Figure 10.

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Figure 10. Low Level Configuration Page
The values of the register map can also be saved by pressing the Save Configuration button under the
File menu option. Additionally, the configuration files can be accessed through the Load Configuration
button.
Other options selectable by the user are the Update Mode,Write Selected (red box), Read Selected
(orange box), Write Modified (gray box) and Read All (yellow box) icons. All icons are displayed in
Figure 11.
Figure 11. Low Level Configuration Page Available Options
If Update Mode is selected to “Immediate”, all changes to register values will update immediately, while
“Deferred” allows the user to modify the value of a register without taking effect until the Write Selected, or
Write Modified icon is pressed.
The Read Selected icon allows individual register reads, while the Read All icon reads the status of all
registers located in the register map.