TDA4VM: Does the PMIC chip need to communicate with the TDA4VM chip before the PMIC works properly?

Hello,

    The PMIC chips do not need to communicate with the TDA4VM chip.  The PMICs will execute the power up sequence when the ENABLE pin goes high, the VCCA voltage is valid, and there are no residual voltages (>150mV) on any of the regulators.

    Please verify what is broken.  When the PMICs power up, if there are any faults (shorts, residual voltages on rails, no voltage on FB_B3 monitor, etc), then the PMICs will shutdown automatically and attempt a recovery.  After 15 recovery attempts the device will remain in the safe recovery state and require a power cycle.

(1) Can you verify any rails or GPIO turning on and off the expected 15 times due to an error.  GPIO9 of PMICA and GPIO11 of PMICB are the first two items to be turned on in the sequence.

(2) While the I2C communication is not needed to start the PMIC this is very valuable to diagnose what is the source of the failure.  The interrupt registers will indicate which regulator the fault occured upon and if the issue was related to OV/UV/SC/ILIM.

Regards,

Chris