Forum Post: RE: Driving ERM using DRV2603 haptic driver

Hazrin,

The DRV2603 has two pins that need to be controlled by an external microcontroller or processor. 

1. EN - the enable pin requires a GPIO control so that you can enable and disable the part
2. PWM - the PWM controls the output amplitude by varying the duty-cycle from 0-100%.  A lot of microcontrollers have dedicated PWM ports which allow you to set the duty cycle.  Take a look at the MSP430G2553 microcontroller and see how the DRV2603EVM-CT uses it to control the duty-cycle. 

The overdrive and braking are automatic only for LRA actuators.  For ERM overdrive, the maximum output is 3V so if your actuator is rated at 3V than there can be no overdrive.  For ERM braking, simply make the voltage negative and the motor will brake.

I would suggest taking a look at the DRV2604 and DRV2605 which have automatic overdrive and braking for ERMs and I2C control.

Thanks,
Brian