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DRV8323R: nFault pin is low despite of no fault or error condition

Prodigy 40 points

Replies: 5

Views: 58

Part Number: DRV8323R

I am controlling PMDC motor using DRV8323RS, sometimes while changing direction of motor my Fault LED lite up permanently (nFault pin goes low). A ISR is configured to read the status register of DRV. following are my observations.

1) toggling Enable pin doesn't change status of fault pin.

2) Reading the Status register on SPI doesn't show any fault.

3)DRV works properly i.e. all modulation works.

4) The Fault pin is clearing only after power cycle.

MotorDriver.pdf

I have connected the PMDC on WH1A and WH2A in the schematic attached. 

please let me know how to reset the fault pin.