I've developed an automotive H-Bridge circuit using the DRV8702-Q1. It's pretty close to the reference schematic in the datasheet but it doesn't work. I've been racking my brain for ideas as to what has gone wrong, but I can't find anything obvious. The host controller is a Raspberry Pi CM3, using 3.3V logic levels to the DRV8702-Q1, with VIN at 12V. The mode pin is pulled to ground to configure it as a full H-Bridge.
The nFault pin indicates that the H-Bridge driver is not in a fault state (constant at 3.3V), the SO pin hovers between 5.4V and 5.48V. VCP is the 9.87V, which matches the high voltage I see on the MOSFET gates.
The MOSFETs I'm using are FDD8447L-F085.
I think the layout appears similar to the datasheet as well, though not identical
This is a scope of the low side gates (GL1, GL2) when EN is on. Changing the phase simply alternates which gate exhibits the waveform shown below. Looks nothing like what I'd expect. The high side gates seem to be stuck at the 9.87V (matching VCP) regardless of what signals are sent on PH/EN. The behavior seems wacky to me, maybe the DRV8702 was failed by ESD.