Production Data
WM9712L
VARIABLE RATE AUDIO / SAMPLE RATE CONVERSION ...............................37
TOUCHPANEL INTERFACE................................................................................38
PRINCIPLE OF OPERATION - FOUR-WIRE TOUCHPANEL ..................................... 38
PRINCIPLE OF OPERATION - FIVE-WIRE TOUCHPANEL........................................ 40
CONTROLLING THE TOUCHPANEL DIGITISER ....................................................... 42
AUXILIARY ADC INPUTS ....................................................................................47
BATTERY MEASUREMENT USING THE BMON/AUX3 PIN ....................................... 47
BATTERY ALARM AND ANALOGUE COMPARATORS ....................................48
GPIO AND INTERRUPT CONTROL ....................................................................51
AC97 DATA AND CONTROL INTERFACE .........................................................58
INTERFACE PROTOCOL............................................................................................ 58
INTERFACE TIMING ................................................................................................... 59
REGISTER MAP...................................................................................................62
REGISTER BITS BY ADDRESS .................................................................................. 63
APPLICATIONS INFORMATION .........................................................................71
RECOMMENDED EXTERNAL COMPONENTS........................................................... 71
LINE OUTPUT ............................................................................................................. 72
AC-COUPLED HEADPHONE OUTPUT....................................................................... 73
DC COUPLED (CAPLESS) HEADPHONE OUTPUT ................................................... 73
BTL LOUDSPEAKER OUTPUT ................................................................................... 74
COMBINED HEADSET / BTL EAR SPEAKER............................................................. 74
COMBINED HEADSET / SINGLE-ENDED EAR SPEAKER......................................... 74
JACK INSERT DETECTION ........................................................................................ 75
HOOKSWITCH DETECTION....................................................................................... 75
PACKAGE DRAWING - QFN ...............................................................................76
PACKAGE DRAWING – TQFP ............................................................................77
IMPORTANT NOTICE ..........................................................................................78
ADDRESS:................................................................................................................... 78
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PD Rev 4.0 December 2003
3
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
