WM8321
Production Data
17.1
17.2
17.3
GENERAL DESCRIPTION............................................................................... 96
POWER PATH MANAGEMENT INTERRUPTS............................................... 96
BACKUP POWER ............................................................................................ 96
18 AUXILIARY ADC......................................................................................... 97
18.1
18.2
18.3
18.4
18.5
GENERAL DESCRIPTION............................................................................... 97
AUXADC CONTROL ........................................................................................ 97
AUXADC READBACK...................................................................................... 99
DIGITAL COMPARATORS............................................................................. 100
AUXADC INTERRUPTS................................................................................. 102
19 RESERVED............................................................................................... 103
20 REAL-TIME CLOCK (RTC)....................................................................... 104
20.1
20.2
20.3
20.4
20.5
GENERAL DESCRIPTION............................................................................. 104
RTC CONTROL.............................................................................................. 104
RTC INTERRUPTS ........................................................................................ 106
DIGITAL RIGHTS MANAGEMENT ................................................................ 107
BACKUP MODE CLOCKING OPTIONS ........................................................ 107
21 GENERAL PURPOSE INPUTS / OUTPUTS (GPIO) ................................ 108
21.1
21.2
21.3
21.4
GENERAL DESCRIPTION............................................................................. 108
GPIO FUNCTIONS......................................................................................... 108
CONFIGURING GPIO PINS........................................................................... 110
GPIO INTERRUPTS....................................................................................... 114
22 SYSTEM STATUS LED DRIVERS............................................................ 115
22.1
22.2
GENERAL DESCRIPTION............................................................................. 115
LED DRIVER CONTROL................................................................................ 115
22.2.1
22.2.2
22.2.3
OTP PROGAM STATUS....................................................................................................115
POWER STATE STATUS..................................................................................................116
MANUAL MODE.................................................................................................................116
22.3
LED DRIVER CONNECTIONS....................................................................... 118
23 INTERRUPT CONTROLLER .................................................................... 119
23.1
23.2
PRIMARY INTERRUPTS ............................................................................... 120
SECONDARY INTERRUPTS......................................................................... 122
23.2.1
23.2.2
POWER STATE INTERRUPT............................................................................................122
THERMAL INTERRUPTS ..................................................................................................123
GPIO INTERRUPTS ..........................................................................................................123
ON PIN INTERRUPTS.......................................................................................................123
WATCHDOG INTERRUPTS..............................................................................................124
AUXADC INTERRUPTS ....................................................................................................124
POWER PATH MANAGEMENT INTERRUPTS.................................................................124
REAL TIME CLOCK AND CRYSTAL OSCILLATOR INTERRUPTS .................................125
OTP MEMORY INTERRUPTS...........................................................................................126
23.2.3
23.2.4
23.2.5
23.2.6
23.2.7
23.2.8
23.2.9
23.2.10 HIGH CURRENT INTERRUPTS........................................................................................126
23.2.11 UNDERVOLTAGE INTERRUPTS......................................................................................127
24 RESETS AND SUPPLY VOLTAGE MONITORING.................................. 128
24.1
24.2
24.3
24.4
RESETS ......................................................................................................... 128
HARDWARE RESET...................................................................................... 130
SOFTWARE RESET ...................................................................................... 130
SUPPLY VOLTAGE MONITORING ............................................................... 132
25 WATCHDOG TIMER ................................................................................. 134
26 TEMPERATURE SENSING ...................................................................... 136
27 VOLTAGE AND CURRENT REFERENCES............................................. 137
27.1
27.2
VOLTAGE REFERENCE (VREF)................................................................... 137
CURRENT REFERENCE (IREF) ................................................................... 137
PD, February 2012, Rev 4.0
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
