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 GENERAL DESCRIPTION ............................................................................. 101
16.2 CURRENT SINK CONTROL .......................................................................... 101
16.2.1
ENABLING THE SINK CURRENT ..................................................................................... 101
16.2.2
PROGRAMMING THE SINK CURRENT ........................................................................... 102
16.2.3
ON/OFF RAMP TIMING ..................................................................................................... 103
16.3 CURRENT SINK INTERRUPTS ..................................................................... 104
16.4 LED DRIVER CONNECTIONS ....................................................................... 105
17
POWER SUPPLY CONTROL ................................................................... 106
17.1 GENERAL DESCRIPTION ............................................................................. 106
17.2 BATTERY POWERED OPERATION ............................................................. 108
17.3 WALL ADAPTOR POWERED OPERATION .................................................. 108
17.4 USB POWERED OPERATION ....................................................................... 109
17.5 POWER PATH MANAGEMENT INTERRUPTS ............................................. 110
17.6 BACKUP POWER .......................................................................................... 111
17.7 BATTERY CHARGER .................................................................................... 111
17.7.1
GENERAL DESCRIPTION ................................................................................................. 111
17.7.2
BATTERY CHARGER ENABLE ......................................................................................... 113
17.7.3
FAST CHARGING .............................................................................................................. 115
17.7.4
CHARGER TIMEOUT AND TERMINATION ...................................................................... 116
17.7.5
BATTERY CHARGE CURRENT MONITORING ................................................................ 117
17.7.6
BATTERY FAULT / OVERVOLTAGE CONDITIONS ......................................................... 118
17.7.7
BATTERY TEMPERATURE MONITORING ...................................................................... 119
17.7.8
BATTERY CHARGER INTERRUPTS ................................................................................ 120
17.7.9
BATTERY CHARGER STATUS ......................................................................................... 121
18
AUXILIARY ADC ....................................................................................... 122
18.1 GENERAL DESCRIPTION ............................................................................. 122
18.2 AUXADC CONTROL ...................................................................................... 122
18.3 AUXADC READBACK .................................................................................... 124
18.4 DIGITAL COMPARATORS............................................................................. 125
18.5 AUXADC INTERRUPTS ................................................................................. 128
19
TOUCH PANEL CONTROLLER ............................................................... 129
19.1 GENERAL DESCRIPTION ............................................................................. 129
19.2 TOUCH PANEL CONFIGURATION ............................................................... 129
19.3 TOUCH PANEL CONTROL............................................................................ 130
19.4 TOUCH PANEL READBACK ......................................................................... 132
19.5 TOUCH PANEL INTERRUPTS ...................................................................... 133
19.6 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 GENERAL DESCRIPTION ............................................................................. 137
20.2 RTC CONTROL .............................................................................................. 137
20.3 RTC INTERRUPTS ........................................................................................ 139
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PP, May 2012, Rev 3.1
6
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
