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Multimedia AC’97 CODEC with
Integrated Touch Screen Controller
DESCRIPTION
The WM9705 is a high-quality stereo audio codec with an
integrated touch screen controller.
The audio section is compliant with the Intel AC’97 Rev 2.2
specification. It performs full-duplex 18-bit codec functions and
supports variable sample rates from 8 to 48k samples/s with
high signal to noise ratio. Optional AC’97 features include 3D
sound enhancement, line-level outputs, stereo buffered
headphone outputs, hardware sample rate conversion,
primary/secondary mode operation and S/PDIF output.
Headphone auto-detect, I
2
S output and headphone buffer on the
mono output are included.
Additionally, the WM9705 integrates a complete 4-wire touch
screen controller, including on-chip screen drivers, pen-down
detection feature, and pressure measurement capability.
A 5-pin digital bi-directional AC-Link serial interface allows
transfer of control data and DAC and ADC words to and from
the AC’97 controller. The WM9705 is fully operable on 3V or 5V
or mixed 3/5V supplies, and is packaged in the industry
standard 48-pin TQFP package with 7mm body size, or in a
smaller 7
×
7
×
0.9mm QFN.
WM9705
FEATURES
•
•
•
•
•
•
•
•
•
•
•
AC’97 rev2.2 compliant codec with pen digitiser
18-bit stereo audio codecs
On-chip sample rate conversion
Multiple channel input mixer
S/PDIF digital audio output
Headphone drivers on AUX and MONO outputs
4-wire touch screen interface with co-ordinate and
pressure measurement, and pen-down detection
Wake-up from sleep mode on pen down
3V to 5V operation
Extensive power management features including hardware
power down option
Standard AC’97 pinout in 48-lead TQFP package or
48-lead QFN package.
APPLICATIONS
•
•
Personal Digital Assistants and ‘Smartphones’
PocketPC systems
BLOCK DIAGRAM
DGND1
DVDD1
DGND2
DVDD2
CX3D1 CX3D2
HPGND
HPVDD
LINEINVOL (Reg 10h)
CDVOL (Reg 12h)
MICVOL (Reg 0Eh)
VID
MUX
ADCNDAC
(Reg 5Ch)
HPVOL
(Reg 04h)
M
U
X
16 / 32Ohm
headphone
HPOUTL
HPOUTR
HPGND
3D
MPM
(Reg 5Ah)
MIXVOL
(Reg 72h)
AUX
HPND
(Reg 5Ch)
LINEINL
LINEINR
CDL
CDGND
CDR
MIC2
MIC1
PHONE
MIC BOOST
MIC SELECT
(Reg 0Eh)
(Reg 20h) M
0/20
U
dB
X
M
U
X headset autodetect
HPOUTL
PHONE
VID
AUX
M
U
X
RECORD
GAIN
(Reg 1Ch)
ADC
L
DIGITAL
FILTERS
Σ∆
MODULATION
DAC
L
RECORD
SELECT
(Reg 1Ah)
ADC
R
VARIABLE
RATE AUDIO
DAC
R
DACVOL
(Reg 18h)
LINEOUTL
LINEOUTR
POP
(Reg 20h)
MASTER VOL
(Reg 02h)
MIX
(Reg 20h)
W
PCBEEP
ADCSEL
(Reg 0Ah)
(Reg 0Ch)
M
U
X
AUXADC
BMON
SAR
ADC
WM9705
M
U
X
MONO VOL
(Reg 06h)
PSEL
(Reg 5Ch)
MONO_OUT
(TX)
PEN DOWN
TOUCH PANEL
SWITCH MATRIX
CONTROL LOGIC
VID
AUX
AC'97
INTERFACE
VREF
VREFOUT
CLOCK
OSC
X+/AUXL
X-/AUXR
XTLOUT
Y+/VIDL
Y-/VIDR
XTLIN
PDRES
AVDD1
AGND1
PENDET
EAPD/BUSY
MASK/LRC
SPEN/I2S
SPDIF
CID
BITCLK
SYNC
SDATAIN
SDATAOUT
RESETB
PCBEEP
PHONE
(RX)
24.576MHz
4-wire resistive
touchpanel
WOLFSON MICROELECTRONICS plc
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Production Data, July 2008, Rev 4.5
Copyright
©2008
Wolfson Microelectronics plc
AGND2
VREF
AVDD2
CAP2
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
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
AC’97 FEATURES.............................................................................................................16
NON - AC’97 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................35
REGISTERS 3AH – SPDIF CONTROL REGISTER ..........................................................36
VENDOR SPECIFIC REGISTERS (INDEX 5AH - 7AH) ....................................................36
SERIAL INTERFACE REGISTER MAP ....................................................................39
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PD Rev 4.5 July 2008
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WM9705
Production Data
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
MASK FUNCTION .............................................................................................................49
STANDBY OPERATION AND WAKE-UP..........................................................................50
AUXILIARY CONVERSIONS.............................................................................................51
PACKAGE DIMENSIONS - TQFP.............................................................................53
PACKAGE DIMENSIONS - QFN...............................................................................54
IMPORTANT NOTICE ...............................................................................................55
ADDRESS: ........................................................................................................................55
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PD Rev 4.5 July 2008
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WM9705
Production Data
ORDERING INFORMATION
DEVICE
WM9705SEFT/V
WM9705SEFT/RV
TEMPERATURE
RANGE
-25 to 85
o
C
-25 to 85
o
C
TEMPERATURE
RANGE
-25 to 85 C
-25 to 85
o
C
o
PACKAGE
48-lead TQFP
(Pb-free)
48-lead TQFP
(Pb-free, tape and reel)
PACKAGE
48-lead QFN
(Pb-free)
48-lead QFN
(Pb-free, tape and reel)
MOISTURE
SENSITIVITY LEVEL
MSL3
MSL3
PEAK SOLDERING
TEMPERATURE
260
o
C
260
o
C
DEVICE
WM9705SEFL/V
WM9705SEFL/RV
Note:
Reel quantity = 2,200
MOISTURE
SENSITIVITY LEVEL
MSL3
MSL3
PEAK SOLDERING
TEMPERATURE
260
o
C
260
o
C
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at
or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical
Characteristics at the test conditions specified.
ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible
to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage
of this device.
Wolfson tests its package types according to IPC/JEDEC J-STD-020B for Moisture Sensitivity to determine acceptable storage
conditions prior to surface mount assembly. These levels are:
MSL1 = unlimited floor life at <30°C / 85% Relative Humidity. Not normally stored in moisture barrier bag.
MSL2 = out of bag storage for 1 year at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
MSL3 = out of bag storage for 168 hours at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
The Moisture Sensitivity Level for each package type is specified in Ordering Information.
Note:
The TQFP version is classified as MSL1 and does not require to be drybagged but will be supplied as such, labelled as MSL1.
CONDITION
Digital supply voltage
Analogue supply voltage
Voltage range digital inputs
Voltage range analogue inputs
Operating temperature range, T
A
Storage temperature after soldering
MIN
-0.3V
-0.3V
DVSS -0.3V
AVDD -0.3V
-25 C
-65
o
C
o
MAX
+7V
+7V
DVDD +0.3V
AVDD +0.3V
+85 C
+150
o
C
o
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PD Rev 4.5 July 2008
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WM9705
Production Data
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Digital supply range
Analogue supply range
Digital ground
Analogue ground
Difference AGND to DGND – Note 1
Difference AVDD to DVDD – Note 2
Note:
1. AGND is normally the same as DGND and HPGND
2. AVDD should be greater than or equal to DVDD
SYMBOL
DVDD1, DVDD2
AVDD1, AVDD2
DGND1, DGND2
AGND1, AGND2,
HPGND
-0.3
-0.3
TEST CONDITIONS
MIN
2.7
2.7
0
0
0
+0.3
5.5
TYP
MAX
5.5
5.5
UNIT
V
V
V
V
V
V
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PD Rev 4.5 July 2008
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