WM8351 datasheet(6/330 Pages) WOLFSON

6 / 330 page

WM8351

Production Data

PD, April 2012, Rev 4.5

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

GENERAL DESCRIPTION ............................................................................. 106

14.2

POWER MANAGEMENT OPERATING STATES .......................................... 106

14.2.1

HIBERNATE STATE SELECTION.....................................................................................107

14.3

POWER SEQUENCING AND CONTROL...................................................... 108

14.3.1

STARTUP ..........................................................................................................................108

14.3.2

POWER-UP SEQUENCING...............................................................................................109

14.3.3

SHUTDOWN ......................................................................................................................109

14.3.4

POWER CYCLING.............................................................................................................110

14.3.5

REGISTER RESET ............................................................................................................110

14.3.6

RESET SIGNALS...............................................................................................................111

14.4

DEVELOPMENT MODE................................................................................. 112

14.4.1

CONTROL INTERFACE REDIRECTION...........................................................................112

14.4.2

STARTING UP IN DEVELOPMENT MODE.......................................................................113

14.4.3

CONFIGURING THE WM8351 IN DEVELOPMENT MODE ..............................................114

14.5

CUSTOM MODES .......................................................................................... 117

14.5.1

CONFIGURATION MODE 01 ............................................................................................118

14.5.2

CONFIGURATION MODE 10 ............................................................................................121

14.5.3

CONFIGURATION MODE 11 ............................................................................................124

14.6

CONFIGURING THE DC-DC CONVERTERS................................................ 127

14.6.1

DC-DC CONVERTER ENABLE .........................................................................................127

14.6.2

CLOCKING.........................................................................................................................127

14.6.3

DC-DC BUCK (STEP-DOWN) CONVERTER CONTROL..................................................128

14.6.4

DC-DC BOOST (STEP-UP) CONVERTER CONTROL .....................................................131

14.6.5

INTERRUPTS AND FAULT PROTECTION .......................................................................133

14.7

CONFIGURING THE LDO REGULATORS .................................................... 135

14.7.1

LDO REGULATOR ENABLE..............................................................................................135

14.7.2

LDO REGULATOR CONTROL ..........................................................................................136

14.7.3

INTERRUPTS AND FAULT PROTECTION .......................................................................138

14.7.4

ADDITIONAL CONTROL FOR LDO1 ................................................................................139

14.8

DC-DC CONVERTER OPERATION .............................................................. 140

14.8.1

OVERVIEW........................................................................................................................140

14.8.2

DC-DC STEP DOWN CONVERTERS ...............................................................................141

14.8.3

DC-DC STEP UP CONVERTER ........................................................................................142

14.9

LDO REGULATOR OPERATION................................................................... 143

15 CURRENT LIMIT SWITCH........................................................................ 144

15.1

GENERAL DESCRIPTION ............................................................................. 144

15.2

CONFIGURING THE CURRENT LIMIT SWITCH .......................................... 144

15.2.1

CURRENT LIMIT SWITCH ENABLE .................................................................................144

15.2.2

CURRENT LIMIT SWITCH BULK DETECTION CONTROL ..............................................145

15.2.3

INTERRUPTS AND FAULT PROTECTION .......................................................................145

16 CURRENT SINKS (LED DRIVERS) .......................................................... 147

16.1

GENERAL DESCRIPTION ............................................................................. 147

16.2

CONSTANT-CURRENT SINK........................................................................ 147

16.2.1

ENABLING THE SINK CURRENT .....................................................................................147

16.2.2

PROGRAMMING THE SINK CURRENT ...........................................................................147

16.2.3

FLASH MODE ....................................................................................................................148

16.2.4

ON/OFF RAMP TIMING.....................................................................................................150

16.2.5

INTERRUPTS AND FAULT PROTECTION .......................................................................150

WM8351 Datasheet(PDF) 6 Page - Wolfson Microelectronics plc

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