WM8255 datasheet(2/49 Pages) CIRRUS

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Production Data

WM8255

PD, Rev 4.7, August 2013

TABLE OF CONTENTS

DESCRIPTION....................................................................................................... 1

FEATURES............................................................................................................ 1

APPLICATIONS..................................................................................................... 1

BLOCK DIAGRAM ................................................................................................ 1

TABLE OF CONTENTS......................................................................................... 2

PIN CONFIGURATION .......................................................................................... 4

ORDERING INFORMATION.................................................................................. 4

PIN DESCRIPTION................................................................................................ 5

ABSOLUTE MAXIMUM RATINGS ........................................................................ 6

RECOMMENDED OPERATING CONDITIONS..................................................... 6

THERMAL PERFORMANCE................................................................................. 6

ELECTRICAL CHARACTERISTICS ..................................................................... 7

INPUT VIDEO SAMPLING ............................................................................................. 10

OUTPUT DATA TIMING................................................................................................. 10

SERIAL INTERFACE ..................................................................................................... 11

PWM TIMING ................................................................................................................. 12

DEVICE DESCRIPTION ...................................................................................... 13

INTRODUCTION............................................................................................................ 13

INPUT SAMPLING ......................................................................................................... 13

RESET LEVEL CLAMPING (RLC) ................................................................................. 13

CDS/NON-CDS PROCESSING ..................................................................................... 14

OFFSET ADJUST AND PROGRAMMABLE GAIN ........................................................ 15

ADC INPUT BLACK LEVEL ADJUST ............................................................................ 16

OVERALL SIGNAL FLOW SUMMARY .......................................................................... 16

CALCULATING OUTPUT FOR ANY GIVEN INPUT...................................................... 16

OUTPUT FORMATS ...................................................................................................... 18

LED CURRENT DRIVE CONTROL ............................................................................... 19

LED CURRENT DRIVE SEQUENCE SYNCHRONISATION AND PROGRESSION..... 20

LED CURRENT DRIVE INTENSITY CONTROL............................................................ 21

LED CURRENT DRIVE CURRENT PWM CONTROL .................................................. 25

LED CURRENT DRIVE CURRENT BLANKING PERIOD ............................................. 26

CURRENT ACCURACY AND ABSOLUTE MAXIMUM CURRENT LIMIT ..................... 30

LED CONTROL WORKED EXAMPLE........................................................................... 32

CONTROL INTERFACE................................................................................................. 34

TIMING REQUIREMENTS ............................................................................................. 34

PROGRAMMABLE VSMP DETECT CIRCUIT............................................................... 35

REFERENCES............................................................................................................... 36

POWER SUPPLY........................................................................................................... 36

POWER MANAGEMENT ............................................................................................... 36

POWER ON SEQUENCE .............................................................................................. 37

OPERATING MODES .................................................................................................... 37

OPERATING MODE TIMING DIAGRAMS..................................................................... 38

DEVICE REVISION CODES .......................................................................................... 39

DEVICE CONFIGURATION................................................................................. 40

EXTENDED PAGE REGISTERS ................................................................................... 41

EXTENDED PAGE REGISTER MAP DESCRIPTION ................................................... 45

RECOMMENDED EXTERNAL COMPONENTS.................................................. 46

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