I've set up a circuit using the DRV8876N Motor Driver, but upon testing have found that the chip is not operating and the fault indicator is showing a fault condition.
According to the data sheet, the fault indicator will show a fault condition when VCP pin is less than 2.25 V with respect to VM. Upon investigation I've found the VCP pin is exhibiting a sawtooth waveform from 0.8V less than VM to 0.8V more than VM. Can you please provide assistance in correcting this issue?
VM is 11.6V
VM to GND bypass capacitor - Parallel 0.1uF 100V C0G and 10uF 25V X5R ceramic capacitors
VCP to VM charge pump storage capacitor - 0.1uF 100V C0G ceramic capacitor
Charge pump flying capacitor (connecting CPH to CPL) - 0.022uF C0G ceramic capacitor