BOOST-DAC8730-HART Software Overview
11
SLAU699 – May 2017
Copyright © 2017, Texas Instruments Incorporated
BOOST-DAC8730-HART Evaluation Module
5.2.2
BOOST-DAC8730-HART High Level Configuration Page
The
High Level Configuration
page provides an interface to observe and control the different data
registers, modes, and configurations available for the BOOST-DAC8730-HART device. This page is
displayed in
Figure 12. High Level Configuration Page
The main page primarily has 3 functions – the
PWM Exerciser
, the
HART Exerciser
(transmit and read),
and the
Device Status
button.
The 16-bit PWM DAC can be exercised by writing to the MSL and LSB fields and pressing the
OK
button
for
Set PWM
– the appropriate code range is 0x1000 - 0xEFFF.
The HART interface is controlled via UART, which is controlled in the firmware of the MSP430FR5969
device. To create a transmit packet type the data, in hexadecimal format, to the
HART DATA
array and
press the
OK
button located under
Start HART Transmission
. The resulting HART waveform can be
captured by monitoring the differential voltage across the loop-supply pins or the shunt resistor. To clear
this array, press the
OK
button located under
Clear HART DATA Buffer
.
NOTE:
The DAC8730 device creates a local ground from the loop-supply voltage. In the case that a
desktop machine is used, the USB connection will share an earth ground connection with the
local ground that is generated from the DAC8730 device. Therefore, to avoid any potential
shorting between earth ground and probed nets, the user will require a differential probe
when inspecting the HART waveform.