5.3 Power-Up/Down Sequence

The following figure illustrates the power-up/down sequence for the ATWILC1000-MR110xB.

The following table provides power-up/down sequence timing parameters.

Table 5-2. Power-Up/Down Sequence Timing
Parameter	Min.	Max.	Units	Description	Notes
t_A	0	—	ms	VBAT rise to VDDIO rise	VBAT and VDDIO can rise simultaneously or connected together. VDDIO must not rise before VBAT.
t_B	0	—	ms	VDDIO rise to CHIP_EN rise	CHIP_EN must not rise before VDDIO. CHIP_EN must be driven high or low and must not be left floating.
t_C	5	—	ms	CHIP_EN rise to RESETN rise	This delay is required to stabilize the XO clock before RESETN removal. RESETN must be driven high or low and must not be left floating.
t_A’	0	—	ms	VDDIO fall to VBAT fall	VBAT and VDDIO must fall simultaneously or be connected together. VBAT must not fall before VDDIO.
t_B’	0	—	ms	CHIP_EN fall to VDDIO fall	VDDIO must not fall before CHIP_EN. CHIP_EN and RESETN must fall simultaneously.
t_C’	0	—	ms	RESETN fall to VDDIO fall	VDDIO must not fall before RESETN. RESETN and CHIP_EN fall simultaneously.