SAMA5D2 datasheet(40/56 Pages) MICROCHIP

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Electrical Characteristics

8.1

Recommended Thermal Operating Conditions

Symbol

Parameter

Conditions

Min

Max

Unit

Ambient temperature

–

-40

+85

°C

Junction temperature

–

-40

+125

°C

RthJA

Junction-to-ambient thermal resistance

BGA196

–

°C/W

BGA289

–

BGA361

–

Allowable power dissipation

BGA196

BGA289

BGA361

TA=70°C

–

1.3

TA=85°C

–

1.0

8.2

Decoupling

100 nF (min) decoupling capacitors must be added on each power supply pin, as close as possible to the device.

8.3

Power Sequences

8.3.1

SAMA5D2 DDR2 SIP

DDRM_VDD, DDRM_VDDL and DDRM_VDDQ power rails must be connected to VDDIODDR (1.8V) on the PCB.

Refer to the sections “Power-up Considerations” and “Power-down Considerations” in the SAMA5D2 Series data

sheet, ref. no. DS60001476, available on www.microchip.com.

8.3.2

SAMA5D2 LPDDR2 SIP

The DDRM_VDD12 power rail must be connected to VDDIODDR (1.2V). The DDRM_VDD18 power rail must be

connected to a 1.8V power supply. For Backup with Self-refresh mode, these power supplies must be maintained.

Important: The sections below supersede “Recommended Power-up Sequence”, “Recommended

Power-up Sequence”, “Power Supply Sequencing at Backup Mode Entry and Exit” in the SAMA5D2 Series

data sheet.

8.3.2.1

Power-up Considerations

At power-up, from a supply sequencing perspective, the SAMA5D2 LPDDR2 SIP power supply inputs are

categorized into two groups:

• Group 1 (core group) contains VDDCORE, VDDUTMIC, VDDHSIC and VDDPLLA.

• Group 2 (periphery group) contains all other power supply inputs except VDDFUSE.

The figure below shows the recommended power-up sequence. Note that:

• 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 unpowered during operation. This is possible if and

only if the application does not access the Customer Fuse Matrix in Write mode. It is good practice to turn

SAMA5D2 SIP

Electrical Characteristics

Datasheet

DS60001484D-page 40

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