ADP5520 datasheet(2/40 Pages) AD

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ADP5520

Rev. 0 | Page 2 of 40

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

Typical Operating Circuit................................................................ 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

I2C Timing Specifications............................................................ 4

Absolute Maximum Ratings............................................................ 5

Thermal Resistance ...................................................................... 5

ESD Caution.................................................................................. 5

Pin Configuration and Function Descriptions............................. 6

Typical Performance Characteristics ............................................. 7

Theory of Operation ........................................................................ 9

Backlight Drive and Control....................................................... 9

Backlight Operating Levels ....................................................... 10

Backlight Maximum and Dim Settings ................................... 10

Backlight Turn On/Off/Dim..................................................... 11

Automatic Dim and Turn Off Timers ..................................... 11

Linear Backlight Fade In and Fade Out................................... 12

Fade Override ............................................................................. 13

Advanced Fading (Square)........................................................ 13

Advanced Fading (Cubic 1 and Cubic 2) ................................ 14

Ambient Light Sensing .............................................................. 14

Automatic Backlight Adjustment............................................. 15

I/O Expansion Pins (GPIOs) .................................................... 15

I/O Expansion Pins (Keypad Matrix)...................................... 15

I/O Expansion Pins and ILED Pin (Auxiliary LED Current

Sinks)............................................................................................ 17

Interrupt Output (nINT)........................................................... 19

Reset Input (nRST) .................................................................... 19

Communication Interface ............................................................. 20

Detailed Register Descriptions ..................................................... 22

Applications Information .............................................................. 34

Converter Topology ................................................................... 34

PCB Layout ................................................................................. 35

Example Circuits ............................................................................ 36

Outline Dimensions ....................................................................... 38

Ordering Guide .......................................................................... 38

REVISION HISTORY

7/08—Revision 0: Initial Version

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