Data Sheet Rev. G, January 2020 | Subject to change without notice

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ACT8945A

Advanced PMU for Atmel SAMA5Dx Series & SAM9 Series Processors

TABLE OF CONTENTS

General Information.....................................................................................................................................................p. 01

Functional Block Diagram ............................................................................................................. p. 04

Ordering Information ...................................................................................................................................................p. 05

Pin Configuration .........................................................................................................................................................p. 05

Pin Descriptions ..........................................................................................................................................................p. 06

Absolute Maximum Ratings.........................................................................................................................................p. 08

I

2C Interface Electrical Characteristics ........................................................................................................................p. 09

Global Register Map....................................................................................................................................................p. 10

Register and Bit Descriptions ......................................................................................................................................p. 11

System Control Electrical Characteristics....................................................................................................................p. 16

Step-Down DC/DC Electrical Characteristics ..............................................................................................................p. 17

Low-Noise LDO Electrical Characteristics...................................................................................................................p. 18

ActivePath

TM Charger Electrical Characteristics .........................................................................................................p. 19

Typical Performance Characteristics...........................................................................................................................p. 21

System Control Information .........................................................................................................................................p. 27

Interfacing with the Atmel SAMA5D3 Series & SAM9 Series Processors...................................................................p. 27

Control Signals ..............................................................................................................................................p. 28

Push-Button Control ......................................................................................................................................p. 29

Control Sequences ........................................................................................................................................p. 29

Functional Description .................................................................................................................................................p. 30

I

2C Interface...................................................................................................................................................p. 30

Voltage Monitor and Interrupt........................................................................................................................p. 30

Thermal Shutdown ........................................................................................................................................p. 31

Step-Down DC/DC Regulators ....................................................................................................................................p. 32

General Description .......................................................................................................................................p. 32

100% Duty Cycle Operation ..........................................................................................................................p. 32

Synchronous Rectification .............................................................................................................................p. 32

Soft-Start........................................................................................................................................................p. 32

Compensation ...............................................................................................................................................p. 32

Configuration Options ....................................................................................................................................p. 32

OK[ ] and Output Fault Interrupt ....................................................................................................................p. 33

PCB Layout Considerations...........................................................................................................................p. 33

Low-Noise, Low-Dropout Linear Regulators................................................................................................................p. 35

General Description .......................................................................................................................................p. 35

Output Current Limit ......................................................................................................................................p. 35

Compensation ...............................................................................................................................................p. 35

Configuration Options ....................................................................................................................................p. 35

OK[ ] and Output Fault Interrupt ....................................................................................................................p. 35

PCB Layout Considerations...........................................................................................................................p. 35

ActivePathTM

Charger ..................................................................................................................................................p. 37

General Description .......................................................................................................................................p. 37

ActivePath

Architecture .................................................................................................................................p. 37

System Configuration Optimization ...............................................................................................................p. 37

Input Protection..............................................................................................................................................p. 37

Battery Management .....................................................................................................................................p. 37