Power supply ---> power on reset (POR)--> then the chip run in the normal mode
Power off ---> Brown Out Detect (BOD)--> then the chip off
Could you clarify which precautions you want to know?
CY8C4247LTI-L475 has VCCD, VDDD, VDDA, VREF(P1,7), VDDIO and VBUS.
I'd like to know the order and timing to apply to these power pins and
the order and timing of turning off these power pins.
VDDD: Power supply for both analog and digital sections (where there is no VDDA pin)
VDDA: Analog VDD pin where package pins allow; should be present before or concurrently with VDDD and the value of VDDA should be equal to or higher than VDDD and VDDIO
VDDIO: I/O pin power domain. It should not be present without VDDD.
VSSA: Analog ground pin where package pins allow; shorted to
VSS: Ground pin
VCCD: Regulated digital supply (1.8 V ±5%), it is an output, not supply.
VBUS: USB voltage. There is no constraint on VBUS with respect to VDDD. However, since it comes from USB, it is typically assumed to and ideally be 5 V (4.35 to 5.5 V is the range).
More about the Power sequence, you can refer to the PSoC 4200L datasheet.https://www.cypress.com/file/222206/download