I have a customer asking about the timing requirements for the AM6526.
The datasheet mentions the timing for the 1.8V rail, but like with the TMDX654GPEVM, there are two devices used for powering different parts of the AM6526.
The below image shows the two devices.
The problem is in their power sequencing. The DS shows these pins (VDDS, MCU, VDDSHVx @ 1.8V pins) all needing to ramp at the same time. But using two devices (1LDO and 1DCDC), even if the EN pin is pulled at the same time, there will be differences in their rise times.
What is the standard procedure that should be adhered to, in regards to timing?
This next image shows how the PG output from the VCC3V3_IO is used for the 1.8V output devices' EN pins. Again, even if the EN is changed at the same time for both devices, there will be differences in ramping. What are the timing constraints between the two? If one of the 1.8V supplies ramps too far before/after the other, will there be current flowing somewhere in the device that could cause overheating/damage etc?
