Operation of the EVM
9
SLVUBG7C – August 2018 – Revised December 2019
Copyright © 2018–2019, Texas Instruments Incorporated
DRV8876/74 Evaluation Module
6
Operation of the EVM
6.1
Dual Motor Operation
This mode allows for up to two motors to be controlled independently. Connect a DC motor across OUT1
and GND. If desired, connect an additional DC motor across OUT2 and GND. To reverse motor direction
of one of the motors, replace the connection from that motor to GND with a connection from that motor to
VM. This can be done with both motors if desired.
Use the following steps to operate the EVM with up to two motors with single direction speed control:
1. Connect a DC motor across OUT1 and GND. If desired, connect an additional DC motor across OUT2
and GND.
2. Adjust the potentiometer, IN1 PWM, to minimum voltage by turning the wheel counter-clockwise all the
way. This minimizes the motor speed of the motor connected across OUT1. If using a second motor,
perform this process with potentiometer IN2 PWM as well.
3. Remove the jumper from the PMODE header so the PMODE pin is Hi-Z.
4. Apply power to J1 header
5. Turn potentiometer, IN1 PWM, clockwise and the motor connected across OUT1 starts to turn.
Continue adjusting, as desired, until the maximum speed is reached. If using a second motor perform
this process with potentiometer IN2 PWM as well.
6. The direction of the motor turning can be reversed, if desired, by removing the connection from GND to
the motor and connecting the motor to VM. If this is done, the potentiometer associated with controlling
the motor will operate in reverse and thus should be turned all the way clockwise before powering on
the board and then slowly turned counter-clockwise to speed up the motor.
6.2
Single Motor Operation
This mode allows for bidirectional control of one motor. Connect a DC motor across OUT1 and OUT2.
Reversing direction os now controlled by the potentiometer. This is described in detail in
Use the following steps to operate the EVM with a signal motor and bidirectional speed control:
1. Connect a motor across OUT1 and OUT2.
2. Use a jumper to connect the PMODE header to 3.3 V or GND to set the input mode to PWM control
mode or PH/EN mode respectively.
3. Adjust both potentiometers, IN1 PWM and IN2 PWM, according to the table of the corresponding
PMODE setting in
.
4. Apply power to J1 header.
5. Control the motor direction and speed by adjusting the potentiometers according to the tables in