WM8311
Pre-Production
15.13 POWER MANAGEMENT INTERRUPTS ......................................................... 92
15.14 POWER GOOD INDICATION .......................................................................... 93
15.15 DC-DC CONVERTER OPERATION ................................................................ 94
15.15.1 OVERVIEW..........................................................................................................................94
15.15.2 DC-DC SYNCHRONOUS BUCK CONVERTERS................................................................95
15.15.3 DC-DC STEP UP CONVERTER..........................................................................................98
15.16 LDO REGULATOR OPERATION..................................................................... 99
15.16.1 OVERVIEW..........................................................................................................................99
15.16.2 LDO REGULATORS ............................................................................................................99
16 CURRENT SINKS ..................................................................................... 101
16.1
16.2
GENERAL DESCRIPTION............................................................................. 101
CURRENT SINK CONTROL .......................................................................... 101
16.2.1
16.2.2
16.2.3
ENABLING THE SINK CURRENT .....................................................................................101
PROGRAMMING THE SINK CURRENT ...........................................................................102
ON/OFF RAMP TIMING.....................................................................................................103
16.3
16.4
CURRENT SINK INTERRUPTS..................................................................... 104
LED DRIVER CONNECTIONS....................................................................... 105
17 POWER SUPPLY CONTROL ................................................................... 106
17.1
17.2
17.3
17.4
17.5
17.6
17.7
GENERAL DESCRIPTION............................................................................. 106
BATTERY POWERED OPERATION ............................................................. 108
WALL ADAPTOR POWERED OPERATION.................................................. 108
USB POWERED OPERATION....................................................................... 109
POWER PATH MANAGEMENT INTERRUPTS............................................. 110
BACKUP POWER .......................................................................................... 111
BATTERY CHARGER .................................................................................... 111
17.7.1
17.7.2
GENERAL DESCRIPTION.................................................................................................111
BATTERY CHARGER ENABLE.........................................................................................113
FAST CHARGING..............................................................................................................115
CHARGER TIMEOUT AND TERMINATION......................................................................116
BATTERY CHARGE CURRENT MONITORING................................................................117
BATTERY FAULT / OVERVOLTAGE CONDITIONS.........................................................118
BATTERY TEMPERATURE MONITORING ......................................................................119
BATTERY CHARGER INTERRUPTS................................................................................120
BATTERY CHARGER STATUS.........................................................................................121
17.7.3
17.7.4
17.7.5
17.7.6
17.7.7
17.7.8
17.7.9
18 AUXILIARY ADC....................................................................................... 122
18.1
18.2
18.3
18.4
18.5
GENERAL DESCRIPTION............................................................................. 122
AUXADC CONTROL ...................................................................................... 122
AUXADC READBACK.................................................................................... 124
DIGITAL COMPARATORS............................................................................. 125
AUXADC INTERRUPTS................................................................................. 128
19 TOUCH PANEL CONTROLLER ............................................................... 129
19.1
19.2
19.3
19.4
19.5
19.6
GENERAL DESCRIPTION............................................................................. 129
TOUCH PANEL CONFIGURATION............................................................... 129
TOUCH PANEL CONTROL............................................................................ 130
TOUCH PANEL READBACK ......................................................................... 132
TOUCH PANEL INTERRUPTS ...................................................................... 133
TOUCH PANEL OPERATING PRINCIPLES.................................................. 133
19.6.1
4-WIRE TOUCH PANEL OPERATION ..............................................................................133
19.6.2
5-WIRE TOUCH PANEL OPERATION ..............................................................................135
20 REAL-TIME CLOCK (RTC)....................................................................... 137
20.1
20.2
20.3
GENERAL DESCRIPTION............................................................................. 137
RTC CONTROL.............................................................................................. 137
RTC INTERRUPTS ........................................................................................ 139
PP, May 2012, Rev 3.1
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
