Texas Instruments DRV8328 EVM Series, User Manual, Page: 18 / 29

• Potentiometer Enable – Enables potentiometer R90 to control the duty cycle of the motor. Duty cycle is
updated in the Duty Cycle slider in real time. Turn all the way clockwise for 0% duty cycle, all the way
counterclockwise for 100% duty cycle.
• Direction – Sets direction of the motor. When enabled, motor spins counterclockwise. When disabled, motor
spins clockwise. When the direction is changed, the motor will coast to a stop, wait 1 second, then accelerate
to the duty cycle in the opposite direction.
• nSLEEP – Places the DRV8328 in a low-power sleep mode. nSLEEP toggle switch only works when resistor
R26 is populated and resistor R75 is DNP.
• DRVOFF (DRV8328C/D only) – Disables all gate drivers in Hi-Z state.
• PWM Frequency – Sets the PWM switching frequency of the motor in Hz.
• MCU Dead Time – Sets the MCU dead time to the PWM inputs in ns. Recommended to set DT to the
minimum on the DRV8328A/B by setting placing 0-ohm resistor for R91.
• Duty Cycle – Sets the duty cycle of the motor when potentiometer is disabled.
• Acceleration Delay – Sets the acceleration and deceleration ramp rate in ms per 1% duty cycle.
MOTOR BRAKING SETTINGS
Stop Motor – Stops the motor when toggled according to the braking method in the drop-down menu. The two
methods are brake (turn on all low-side MOSFETs) and coast (float all MOSFETs).
EXTERNAL CSA SETTINGS
• Over-current Limit – Sets the overcurrent limit in amps. If ISEN is measured to be over the overcurrent limit,
Over-Current fault is triggered.
• Current Sense Resistor – Sets the resistor value in ohms for the shunt resistor onboard the EVM. Default
resistor populated is 0.001 ohm.
• CSA Gain – Gain of the external CSA on the EVM. Fixed at 20 V/V.
FAULT STATUS BITS
• Fault Status – Logical “or” of all faults. When a fault occurs, output enable is set to 0 and duty cycle is set to
0 and Fault Status bit is set.
• PVDD Overvoltage Fault – PVDD is over 60 V.
• PVDD Undervoltage Fault – PVDD is under 4.5 V.
• Over-Current – Measured LSS current is over the Over-Current threshold.
• DRV8328 Fault – Fault indicated by the DRV8328. See DRV8328 datasheet.
Firmware and GUI Application www.ti.com
18 DRV8328xEVM User's Guide SLVUCD3A – NOVEMBER 2021 – REVISED AUGUST 2022
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