Mechanism & thresholds:
If logic supply drops below VDDPOR_FALL for a time greater than
tPOR, then a power on reset will occur that will hard reset
the device.
Action:
nFAULT pin is de-asserted
OUT is Hi-Z
IPROPI pin is
Hi-Z.
When this supply
recovers above the VDDPOR_RISE level, the device will go
through a wake-up initialization and nFAULT pin will be asserted low
to notify the user on this reset (Refer Wake-up transients).
HW and SPI (S) variant: These thresholds translate to
VMPOR_FALL and VMPOR_RISE as the logic supply is
internally derived from the VM supply
Only for SPI (P) variant: These thresholds directly map to the VDD pin
voltage (VDDPOR_FALL and VDDPOR_RISE)
Fault reaction: Always retry,
retry time depends on the external supply condition to initiate a device
wake-up