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DRV8884EVM: nFault pin of DRV8884 always be low.

Part Number: DRV8884EVM

Hi

I have a problem with the DRV8884EVM。when I turn on the power (power of mcu and  motor driver),mcu is good running; and then I just set nSleep pin to high, nFault pin changes to low, and keeps low until set nSleep pin to low.

Picture below is gui settings.

VM voltage is 9.6V

VCP is 7.8V

I did not  connect a motor.

what problem would lead to vcp is lower than (vm +2)V, how to solve the problem?

Thanks in advance!