Hardware and Software Overview
4
SLVUB68A – October 2017 – Revised August 2018
Copyright © 2017–2018, Texas Instruments Incorporated
DRV8873xEVM User’s Guide
Figure 2. EVM Connections (Actual Board May Differ)
2.3
LED Lights and Switch Functions
Two LED switches and one push-button switch are available on the DRV8873xEVM to notify the user of
different motor statuses and to control the operation of the motor. The STATUS LED will blink at a regular
interval to provide an indication the MSP430G2553 MCU is powered and code is running. The nFAULT
LED will light when the DRV8873 device detects an abnormal condition, such as overcurrent,
overtemperature, or open load.
The S1 switch is configured to reset the MSP430G2553 MCU. By moving the J2 jumper to the alternate
position, the switch can be used as a general-purpose input if user-supplied code is installed.
2.4
Optional EVM heatsink and circuitry
The DRV8873xEVM was designed to accept an optional heatsink to the bottom of the board. This allows
evaluation of the device at higher currents. The Advanced Thermal Solutions heatsink, part number
ATS-
1109-C1-R0
is available at distributors. TI also recommends use of a thermally conductive insulator
between the board and heatsink, such as
Berquist SPK10-0.006-AC-11.512
.
The H variant of the DRV8873xEVM includes an dual channel operation amplifier that is not required for
normal operation of the device. The operational amplifier is used to translate 3 voltage levels from the
3.3V domain to 3 voltage levels in the 5V DRV8873 DVDD domain. These voltages are used to control the
operational mode and output slew rates. In normal operation of the device, resistors should be used to
select the desired operational mode and output slew rates.