WM8321 datasheet(6/253 Pages) WOLFSON

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WM8321

Production Data

PD, February 2012, Rev 4.0

17.1

GENERAL DESCRIPTION ............................................................................... 96

17.2

POWER PATH MANAGEMENT INTERRUPTS ............................................... 96

17.3

BACKUP POWER ............................................................................................ 96

AUXILIARY ADC......................................................................................... 97

18.1

GENERAL DESCRIPTION ............................................................................... 97

18.2

AUXADC CONTROL ........................................................................................ 97

18.3

AUXADC READBACK ...................................................................................... 99

18.4

DIGITAL COMPARATORS............................................................................. 100

18.5

AUXADC INTERRUPTS................................................................................. 102

RESERVED ............................................................................................... 103

REAL-TIME CLOCK (RTC)....................................................................... 104

20.1

GENERAL DESCRIPTION ............................................................................. 104

20.2

RTC CONTROL.............................................................................................. 104

20.3

RTC INTERRUPTS ........................................................................................ 106

20.4

DIGITAL RIGHTS MANAGEMENT ................................................................ 107

20.5

BACKUP MODE CLOCKING OPTIONS ........................................................ 107

GENERAL PURPOSE INPUTS / OUTPUTS (GPIO) ................................ 108

21.1

GENERAL DESCRIPTION ............................................................................. 108

21.2

GPIO FUNCTIONS......................................................................................... 108

21.3

CONFIGURING GPIO PINS........................................................................... 110

21.4

GPIO INTERRUPTS....................................................................................... 114

SYSTEM STATUS LED DRIVERS............................................................ 115

22.1

GENERAL DESCRIPTION ............................................................................. 115

22.2

LED DRIVER CONTROL................................................................................ 115

22.2.1

OTP PROGAM STATUS....................................................................................................115

22.2.2

POWER STATE STATUS ..................................................................................................116

22.2.3

MANUAL MODE.................................................................................................................116

22.3

LED DRIVER CONNECTIONS....................................................................... 118

INTERRUPT CONTROLLER .................................................................... 119

23.1

PRIMARY INTERRUPTS ............................................................................... 120

23.2

SECONDARY INTERRUPTS ......................................................................... 122

23.2.1

POWER STATE INTERRUPT............................................................................................122

23.2.2

THERMAL INTERRUPTS ..................................................................................................123

23.2.3

GPIO INTERRUPTS ..........................................................................................................123

23.2.4

ON PIN INTERRUPTS .......................................................................................................123

23.2.5

WATCHDOG INTERRUPTS ..............................................................................................124

23.2.6

AUXADC INTERRUPTS ....................................................................................................124

23.2.7

POWER PATH MANAGEMENT INTERRUPTS.................................................................124

23.2.8

REAL TIME CLOCK AND CRYSTAL OSCILLATOR INTERRUPTS .................................125

23.2.9

OTP MEMORY INTERRUPTS...........................................................................................126

23.2.10

HIGH CURRENT INTERRUPTS........................................................................................126

23.2.11

UNDERVOLTAGE INTERRUPTS......................................................................................127

RESETS AND SUPPLY VOLTAGE MONITORING .................................. 128

24.1

RESETS ......................................................................................................... 128

24.2

HARDWARE RESET...................................................................................... 130

24.3

SOFTWARE RESET ...................................................................................... 130

24.4

SUPPLY VOLTAGE MONITORING ............................................................... 132

WATCHDOG TIMER ................................................................................. 134

TEMPERATURE SENSING ...................................................................... 136

VOLTAGE AND CURRENT REFERENCES ............................................. 137

27.1

VOLTAGE REFERENCE (VREF)................................................................... 137

27.2

CURRENT REFERENCE (IREF) ................................................................... 137

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