WM9705 w Multimedia AC97 CODEC with Integrated Touch Screen Controller DESCRIPTION FEATURES AC97 rev2.2 compliant CODEC with pen digitiser The WM9705 is a high-quality stereo audio CODEC with an integrated touch screen controller. 18-bit stereo audio CODECs On-chip sample rate conversion The audio section is compliant with the Intel AC97 Rev 2.2 Multiple channel input mixer specification. It performs full-duplex 18-bit CODEC functions and supports variable sample rates from 8 to 48k samples/s with S/PDIF digital audio output high signal to noise ratio. Optional AC97 features include 3D Headphone drivers on AUX and MONO outputs sound enhancement, line-level outputs, stereo buffered 4-wire touch screen interface with co-ordinate and pressure headphone outputs, hardware sample rate conversion, measurement, and pen-down detection primary/secondary mode operation and S/PDIF output. 2 Wake-up from sleep mode on pen down Headphone auto-detect, I S output and headphone buffer on the 3V to 5V operation mono output are included. Extensive power management features including hardware Additionally, the WM9705 integrates a complete 4-wire touch power down option screen controller, including on-chip screen drivers, pen-down Standard AC97 pinout in 48-lead TQFP package or detection feature, and pressure measurement capability. 48-lead QFN package. A 5-pin digital bi-directional AC-Link serial interface allows APPLICATIONS transfer of control data and DAC and ADC words to and from the AC97 controller. The WM9705 is fully operable on 3V or 5V or Personal Digital Assistants and Smartphones mixed 3/5V supplies, and is packaged in the industry standard Pocket PC systems 48-pin TQFP package with 7mm body size, or in a smaller 7 7 0.9mm QFN. BLOCK DIAGRAM DGND1 DVDD1 DGND2 DVDD2 CX3D1 CX3D2 HPGND HPVDD ADCNDAC MUX (Reg 5Ch) 16 / 32Ohm LINEINVOL (Reg 10h) HPVOL headphone (Reg 04h) CDVOL (Reg 12h) M HPOUTL U MICVOL (Reg 0Eh) X HPOUTR 3D HPGND HPND MIXVOL VID (Reg 5Ch) (Reg 72h) RECORD DIGITAL AUX ADC DAC LINEINL GAIN FILTERS L L (Reg 1Ch) LINEINR M PHONE CDL U LINEOUTL MODULATION X CDGND LINEOUTR DACVOL MIC BOOST VID ADC DAC MIC SELECT VARIABLE MASTER VOL CDR (Reg 18h) (Reg 0Eh) RECORD AUX R R POP (Reg 20h) RATE AUDIO (Reg 02h) M MIC2 SELECT 0/20 (Reg 20h) U (Reg 1Ah) dB MIX X M MIC1 (Reg 20h) U X headset autodetect M (Reg 0Ah) (Reg 0Ch) W MONO OUT U (TX) HPOUTL PCBEEP WM9705 X PHONE SAR M MONO VOL AUXADC ADC U ADCSEL (Reg 06h) X PSEL BMON PEN DOWN (Reg 5Ch) TOUCH PANEL SWITCH MATRIX VREF VREFOUT AC 97 CONTROL LOGIC CLOCK INTERFACE OSC VID AUX 24.576MHz 4-wire resistive touchpanel WOLFSON MICROELECTRONICS plc Production Data, November 2011, Rev 4.6 To receive regular email updates, sign up at WM9705 Production Data TABLE OF CONTENTS DESCRIPTION ............................................................................................................ 1 FEATURES ................................................................................................................. 1 APPLICATIONS .......................................................................................................... 1 BLOCK DIAGRAM ..................................................................................................... 1 TABLE OF CONTENTS .............................................................................................. 2 ORDERING INFORMATION ....................................................................................... 4 ABSOLUTE MAXIMUM RATINGS ............................................................................. 4 RECOMMENDED OPERATING CONDITIONS .......................................................... 5 PIN CONFIGURATION ............................................................................................... 6 PIN DESCRIPTION ..................................................................................................... 7 ELECTRICAL CHARACTERISTICS .......................................................................... 8 POWER CONSUMPTION ......................................................................................... 12 DETAILED TIMING DIAGRAMS .............................................................................. 13 AC-LINK LOW POWER MODE ........................................................................................... 13 COLD RESET ...................................................................................................................... 13 WARM RESET .................................................................................................................... 14 CLOCK SPECIFICATIONS ................................................................................................. 14 DATA SETUP AND HOLD (50PF EXTERNAL LOAD) ........................................................ 15 SIGNAL RISE AND FALL TIMES ........................................................................................ 15 DEVICE DESCRIPTION ........................................................................................... 16 INTRODUCTION ................................................................................................................. 16 AC97 FEATURES ............................................................................................................... 16 NON - AC97 FEATURES .................................................................................................... 17 PEN DIGITIZER AND AUXILIARY ADC .............................................................................. 19 3-D STEREO ENHANCEMENT .......................................................................................... 19 VARIABLE SAMPLE RATE SUPPORT ............................................................................... 20 2 SPDIF OR I S DIGITAL AUDIO DATA OUTPUT ................................................................ 20 PRIMARY/SECONDARY ID SUPPORT .............................................................................. 21 HEADPHONE DRIVE AND HEADSET AUTODETECT ...................................................... 21 DATA SLOT MAPPING ....................................................................................................... 23 AC-LINK DIGITAL SERIAL INTERFACE PROTOCOL ....................................................... 23 AC-LINK AUDIO OUTPUT FRAME (SDATAOUT) .............................................................. 25 AC-LINK AUDIO INPUT FRAME (SDATAIN) ...................................................................... 27 AC-LINK LOW POWER MODE ........................................................................................... 29 WAKING UP THE AC-LINK ................................................................................................. 29 SERIAL INTERFACE REGISTER MAP DESCRIPTION ..................................................... 30 REGISTER 28H EXTENDED AUDIO ID .......................................................................... 34 REGISTER 2AH EXTENDED AUDIO STATUS AND CONTROL REGISTER ................. 35 REGISTER 2CH AND 32H AUDIO SAMPLE RATE CONTROL REGISTERS ................ 36 REGISTERS 3AH SPDIF CONTROL REGISTER ............................................................ 36 VENDOR SPECIFIC REGISTERS (INDEX 5AH - 7AH) ...................................................... 36 SERIAL INTERFACE REGISTER MAP ................................................................... 39 PEN DIGITISER OPERATION .................................................................................. 40 TIMING OF PEN DIGITISER OPERATIONS ...................................................................... 41 CONTROL OF PEN DIGITISER FUNCTIONS .................................................................... 41 READBACK OF PEN DIGITISER RESULTS ...................................................................... 42 CONVERSION CONTROL .................................................................................................. 43 PRESSURE MEASUREMENT ............................................................................................ 48 PD, Rev 4.6, November 2011 w 2