WM8321 datasheet(4/253 Pages) WOLFSON

4 / 253 page

WM8321

Production Data

PD, February 2012, Rev 4.0

TABLE OF CONTENTS

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

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

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

BLOCK DIAGRAM ................................................................................................ 2

TYPICAL APPLICATIONS .................................................................................... 3

TABLE OF CONTENTS......................................................................................... 4

PIN CONFIGURATION.................................................................................. 8

ORDERING INFORMATION ......................................................................... 8

PIN DESCRIPTION ....................................................................................... 9

THERMAL CHARACTERISTICS ................................................................ 13

ABSOLUTE MAXIMUM RATINGS.............................................................. 14

RECOMMENDED OPERATING CONDITIONS .......................................... 15

ELECTRICAL CHARACTERISTICS ........................................................... 16

7.1 DC-DC SYNCHRONOUS BUCK CONVERTERS ............................................... 16

7.2 LDO REGULATORS............................................................................................ 17

7.3 RESET THRESHOLDS ....................................................................................... 22

7.4 REFERENCES .................................................................................................... 22

7.5 GENERAL PURPOSE INPUTS / OUTPUTS (GPIO)........................................... 23

7.6 DIGITAL INTERFACES ....................................................................................... 24

7.7 AUXILIARY ADC.................................................................................................. 24

7.8 SYSTEM STATUS LED DRIVERS ...................................................................... 24

TYPICAL POWER CONSUMPTION ........................................................... 25

TYPICAL PERFORMANCE DATA.............................................................. 26

9.1 DC-DC CONVERTERS ....................................................................................... 26

9.2 LDO REGULATORS............................................................................................ 26

SIGNAL TIMING REQUIREMENTS ............................................................ 27

10.1

CONTROL INTERFACE................................................................................... 27

DEVICE DESCRIPTION .............................................................................. 29

11.1

GENERAL DESCRIPTION ............................................................................... 29

11.2

POWER STATES ............................................................................................. 29

11.3

POWER STATE CONTROL ............................................................................. 31

11.4

POWER STATE INTERRUPTS........................................................................ 36

11.5

POWER STATE GPIO INDICATION................................................................ 36

11.6

ON PIN FUNCTION.......................................................................................... 37

11.7

RESET PIN FUNCTION ................................................................................... 38

CONTROL INTERFACE.............................................................................. 40

12.1

GENERAL DESCRIPTION ............................................................................... 40

12.2

2-WIRE (I2C) CONTROL MODE...................................................................... 40

12.3

4-WIRE (SPI) CONTROL MODE...................................................................... 43

12.4

12.5

SOFTWARE RESET AND CHIP ID.................................................................. 44

12.6

SOFTWARE SCRATCH REGISTER................................................................ 44

CLOCKING AND OSCILLATOR CONTROL .............................................. 45

13.1

GENERAL DESCRIPTION ............................................................................... 45

13.2

CRYSTAL OSCILLATOR INTERRUPTS ......................................................... 47

13.3

CRYSTAL OSCILLATOR CONNECTIONS...................................................... 48

INSTANTCONFIG™ (ICE) AND OTP MEMORY CONTROL...................... 49

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