WM9715L w AC97 Audio and Touchpanel CODEC DESCRIPTION FEATURES AC97 Rev 2.2 compatible stereo CODEC The WM9715L is a highly integrated input / output device - DAC SNR 90dB, THD 86dB designed for mobile computing and communications. The - ADC SNR 88dB, THD 88dB device can connect directly to a 4-wire or 5-wire touchpanel, - Variable Rate Audio, supports all WinCE sample rates mono or stereo microphones, stereo headphones and a - Tone Control, Bass Boost and 3D Enhancement mono speaker, reducing total component count in the On-chip 45mW headphone driver system. Additionally, phone input and output pins are On-chip 400mW mono speaker driver provided for seamless integration with wireless Stereo, mono or differential microphone input communication devices. - Automatic Level Control (ALC) The WM9715L also offers up to four auxiliary ADC inputs for Auxiliary mono DAC (ring tone or DC level generation) analogue measurements such as temperature or light. To Seamless interface to wireless chipset monitor the battery voltage in portable systems, the Resistive touchpanel interface WM9715L has two uncommitted comparator inputs. - Supports 4-wire and 5-wire panels - 12-bit resolution, INL 3 LSBs (<0.5 pixels) All device functions are accessed and controlled through a - X, Y and touch-pressure (Z) measurement single AC-Link interface compatible with the AC97 standard - Pen-down detection supported in Sleep Mode (rev 2.2). Additionally, the WM9715L can generate interrupts 2 comparator inputs for battery monitoring to indicate pen down, pen up, availability of touchpanel data, Up to 4 auxiliary ADC inputs low battery, and dead battery. 1.8V to 3.6V supplies The WM9715L operates at supply voltages from 1.8 to 3.6 7x7mm QFN Volts. Each section of the chip can be powered down under APPLICATIONS software control to save power. The device is available in a small leadless 7x7mm QFN package, ideal for use in hand- Personal Digital Assistants (PDA) held portable systems. Smartphones Handheld and Tablet Computers BLOCK DIAGRAM WOLFSON MICROELECTRONICS plc Production Data, November 2011, Rev 4.1 To receive regular email updates, sign up at WM9715L Production Data TABLE OF CONTENTS DESCRIPTION ....................................................................................................... 1 FEATURES ............................................................................................................ 1 APPLICATIONS ..................................................................................................... 1 BLOCK DIAGRAM ................................................................................................ 1 TABLE OF CONTENTS ......................................................................................... 2 PIN CONFIGURATION .......................................................................................... 4 ORDERING INFORMATION .................................................................................. 4 PIN DESCRIPTION ................................................................................................ 5 ABSOLUTE MAXIMUM RATINGS ........................................................................ 6 RECOMMENDED OPERATING CONDITIONS ..................................................... 6 ELECTRICAL CHARACTERISTICS ..................................................................... 7 AUDIO OUTPUTS ............................................................................................................ 7 AUDIO INPUTS ................................................................................................................ 8 AUXILIARY MONO DAC (AUXDAC) ................................................................................ 8 TOUCHPANEL AND AUXILIARY ADC ............................................................................ 9 COMPARATORS ............................................................................................................. 9 REFERENCE VOLTAGES ............................................................................................. 10 DIGITAL INTERFACE CHARACTERISTICS ................................................................. 10 HEADPHONE / SPEAKER OUTPUT THD VERSUS POWER ...................................... 11 POWER CONSUMPTION .............................................................................................. 12 DEVICE DESCRIPTION ...................................................................................... 13 INTRODUCTION ............................................................................................................ 13 AUDIO PATHS OVERVIEW ........................................................................................... 14 AUDIO INPUTS.................................................................................................... 15 LINE INPUT .................................................................................................................... 15 MICROPHONE INPUT ................................................................................................... 15 PHONE INPUT ............................................................................................................... 17 PCBEEP INPUT ............................................................................................................. 18 AUDIO ADC ......................................................................................................... 19 RECORD SELECTOR.................................................................................................... 20 RECORD GAIN .............................................................................................................. 21 AUTOMATIC LEVEL CONTROL .................................................................................... 22 AUDIO DACS ...................................................................................................... 25 STEREO DAC ................................................................................................................ 25 AUXILIARY DAC ............................................................................................................ 28 ANALOGUE AUDIO OUTPUTS .......................................................................... 30 HEADPHONE OUTPUTS HPOUTL AND HPOUTR ................................................... 30 EAR SPEAKER OUTPUT OUT3 ................................................................................. 31 LOUDSPEAKER OUTPUTS LOUT2 AND ROUT2 ..................................................... 32 PHONE OUTPUT (MONOOUT) ..................................................................................... 33 THERMAL SENSOR ...................................................................................................... 33 DIGITAL AUDIO (SPDIF) OUTPUT ............................................................................... 34 AUDIO MIXERS ............................................................................................................. 35 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 PD, Rev 4.1, November 2011 w 2