Hardware and Software Overview
5
SLVUB68A – October 2017 – Revised August 2018
Copyright © 2017–2018, Texas Instruments Incorporated
DRV8873xEVM User’s Guide
2.5
Additional circuitry placed on the Hardware version
The hardware variation of the EVM has a dual channel operational amplifier (opamp) placed on the board.
This opamp is used to convert the 0-V, a mid voltage, and 3.3-V output of the MSP430G2553 to 0V, twice
the mid voltage, and DVDD using the DVDD voltage.
Figure 3. Mode and Slew Rate Selection Circuitry of Hardware variation
The SR pin of the Hardware variant can be manually configured to test any of the six slew rate settings.
To manually set the slew rate, perform the following steps:
•
Remove R25 to isolate the output of the opamp from the MODE pin
•
Populate R20 to connect to DVDD or
•
R26 to connect to ground
NOTE:
If manually configuring the slew rate, the GUI pulldown is not applicable.
3
GUI Application
The GUI is used to control the DRV8873xEVM through USB commands. The commands are sent from the
computer to the FTDI FT233RL device, which converts USB commands to UART commands. The UART
commands are received by the MSP430G2553 MCU.
3.1
Installation
Follow these steps to install the GUI application:
Step 1.
Double click on the
Setup_DRV8873x-y.y.y_EVM.exe
file. The y.y.y values shown may
change as the GUI is updated.
Step 2.
Click the
Yes
button in the
User Account Control Window
to continue (see
).