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The DRV8601 is a very simple part. It has 2 analog inputs – it is a simple differential input/output analog amplifier with an enable pin. The inputs can be driven with a PWM signal. This part is deigned to drive DC motors, ERMs or LRAs for haptic purposes.
We have no idea what kind of motor you are driving. If you would like to provide some specs and requirements, maybe we can help you setup the PWM input.
A PWM signal is a square wave, which is an analog signal. There are multiple ways you can configure the 2 analog inputs depending on how you want to control the motor. Refer to the application section of the datasheet.
For more information, like how to set the PWM frequency, refer to the EVM users guide. Note from section 2.2:
“(a) For LRAs, drive a PWM signal at the resonant frequency of the LRA. ensure that the low-pass corner frequency is beyond the resonant frequency of the LRA.
(b) For ERMs, drive a PWM signal below 30 kHz”
For an ERM (or motor), you want to drive a DC voltage. You adjust the PWM duty cycle to change this DC voltage. ERMs (motors in general) will not react to high frequency signals, so if you drive one with a 20-25kHz square wave, they will react as if this is a DC voltage.
