WM8352
Production Data
13.12.2 MICROPHONE DETECTION.............................................................................................100
13.12.3 MID-RAIL REFERENCE (VMID)........................................................................................101
13.12.4 ANTI-POP CONTROL........................................................................................................102
13.12.5 UNUSED ANALOGUE INPUTS/OUTPUTS .......................................................................103
13.12.6 ZERO CROSS TIMEOUT ..................................................................................................105
13.12.7 INTERRUPTS AND FAULT PROTECTION .......................................................................105
14 POWER MANAGEMENT SUBSYSTEM....................................................106
14.1
14.2
GENERAL DESCRIPTION ........................................................................... 106
POWER MANAGEMENT OPERATING STATES......................................... 106
14.2.1
HIBERNATE STATE SELECTION.....................................................................................107
14.3
POWER SEQUENCING AND CONTROL .................................................... 108
14.3.1
14.3.2
14.3.3
14.3.4
14.3.5
14.3.6
STARTUP ..........................................................................................................................108
POWER-UP SEQUENCING ..............................................................................................109
SHUTDOWN......................................................................................................................109
POWER CYCLING ............................................................................................................110
REGISTER RESET............................................................................................................110
RESET SIGNALS...............................................................................................................111
14.4
DEVELOPMENT MODE............................................................................... 112
14.4.1
14.4.2
14.4.3
CONTROL INTERFACE REDIRECTION...........................................................................112
STARTING UP IN DEVELOPMENT MODE.......................................................................113
CONFIGURING THE WM8352 IN DEVELOPMENT MODE..............................................115
14.5
CUSTOM MODES........................................................................................ 117
14.5.1
14.5.2
14.5.3
CONFIGURATION MODE 01 ............................................................................................117
CONFIGURATION MODE 10 ............................................................................................120
CONFIGURATION MODE 11 ............................................................................................123
14.6
CONFIGURING THE DC-DC CONVERTERS .............................................. 126
14.6.1
14.6.2
14.6.3
14.6.4
14.6.5
DC-DC CONVERTER ENABLE.........................................................................................126
CLOCKING ........................................................................................................................127
DC-DC BUCK (STEP-DOWN) CONVERTER CONTROL..................................................127
DC-DC BOOST (STEP-UP) CONVERTER CONTROL......................................................130
INTERRUPTS AND FAULT PROTECTION .......................................................................132
14.7
CONFIGURING THE LDO REGULATORS .................................................. 135
14.7.1
14.7.2
14.7.3
14.7.4
LDO REGULATOR ENABLE .............................................................................................135
LDO REGULATOR CONTROL..........................................................................................136
INTERRUPTS AND FAULT PROTECTION .......................................................................138
ADDITIONAL CONTROL FOR LDO1 ................................................................................139
14.8
DC-DC CONVERTER OPERATION............................................................. 140
14.8.1
14.8.2
14.8.3
OVERVIEW........................................................................................................................140
DC-DC STEP DOWN CONVERTERS...............................................................................141
DC-DC STEP UP CONVERTERS......................................................................................142
14.9
LDO REGULATOR OPERATION ................................................................. 143
15 CURRENT LIMIT SWITCH ........................................................................144
15.1
15.2
GENERAL DESCRIPTION ........................................................................... 144
CONFIGURING THE CURRENT LIMIT SWITCH......................................... 144
15.2.1
15.2.2
15.2.3
CURRENT LIMIT SWITCH ENABLE .................................................................................144
CURRENT LIMIT SWITCH BULK DETECTION CONTROL..............................................145
INTERRUPTS AND FAULT PROTECTION .......................................................................145
16 CURRENT SINKS (LED DRIVERS) ..........................................................147
16.1
16.2
GENERAL DESCRIPTION ........................................................................... 147
CONSTANT-CURRENT SINKS.................................................................... 147
16.2.1
16.2.2
16.2.3
16.2.4
16.2.5
ENABLING THE SINK CURRENT.....................................................................................147
PROGRAMMING THE SINK CURRENT............................................................................148
FLASH MODE....................................................................................................................148
ON/OFF RAMP TIMING.....................................................................................................150
INTERRUPTS AND FAULT PROTECTION .......................................................................150
PD, February 2011, Rev 4.4
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
