Often, the info shown in data sheets can leave a few things unsaid, so I have to ask.
ABS Max appears to allow control inputs to be as high as 5.75v, and this is good because it's not referenced to an internal or external rail. Also, Figure 7-17 shows only a zener as input protection. Nonetheless, a protection diode to the internal DVDD rail could be present. If that is true, then when VM is removed, those input protection diodes would clamp the SPI buss to a diode drop above GND and that would be bad if SPI is shared among other devices not powered down.
Does the SPI buss operate normally if one DRV8434S device in a parallel SPI buss is powered down?
