ATSAMA5D31A-CFU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATSAMA5D31A-CFU

SMART ARM-based MPU

Atmel Corporation 

4.2 Power Sequence Requirements

4.2.1

Power-up Considerations

From a power-up supply sequencing perspective, Atmel SAMA5D3x power supply inputs are categorized into two

groups:

 Group 1, the core group, containing VDDCORE, VDDUTMIC and VDDPLLA

 Group 2, the periphery group, containing all other power supply inputs.

Figure 4-1 gives the recommended power-up sequence with the following precisions:

 VDDBU, when supplied from a battery is an always-on supply input and is therefore not part of the power

supply sequencing. When no backup battery is present in the application, VDDBU is part of Group 2.

 VDDFUSE is the only power supply that may be left un-powered during operation. This is possible if and

only if the application does not access the fuse box in write mode. VDDFUSE must be applied when

programming the fuse box.

 VDDIODDR may be nominally supplied at 1.2V when the SAMA5D3x is equipped with an LPDDR2 memory.

In this case, VDDIODDR can be considered as part of Group 1.

Figure 4-1. Recommended Power-up Sequence

VDDBU

VDDANA

VDDOSC

VDDIOM

VDDFUSE

VDDIOP0

VDDIOP1

VDDUTMII

VDDIODDR

Group 2

No specific order and no

specific timing required

among these channels

VDDCORE

t1

VDDPLLA

VDDUTMIC

NRST

Group 1

t2

tRSTPU

time

28 SAMA5D3 Series [DATASHEET]

Atmel-11121F-ATARM-SAMA5D3-Series-Datasheet_02-Feb-16

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