WM9705
Multimedia AC'97 CODEC with
Integrated Touch Screen Controller
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Production Data, December 2003, Rev 4.0
Copyright
2003 Wolfson Microelectronics plc
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.
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-pin TQFP package or 48-pin
QFN package.
APPLICATIONS
Personal Digital Assistants and `Smartphones'
PocketPC systems
BLOCK DIAGRAM
W
WM9705
DVDD1
DGND1
DAC
L
HPGND
HPVDD
HPGND
DAC
R
SD
ATAIN
SY
N
C
BITC
L
K
R
ESET
B
SD
ATAO
U
T
DIGITAL
FILTERS
MODULATION
VARIABLE
RATE AUDIO
Y+/VID
L
X+
/
A
U
X
L
X-/AU
X
R
Y
-
/VID
R
PEN DOWN
AUXADC
TOUCH PANEL
SWITCH MATRIX
XT
L
I
N
XT
L
O
U
T
4-wire resistive
touchpanel
16 / 32Ohm
headphone
ADCSEL
CLOCK
OSC
HPOUTL
HPOUTR
VREFOUT
VR
EF
A
V
DD2
AG
N
D
2
C
AP2
DACVOL
(Reg 18h)
P
C
BEE
P
HPVOL
(Reg 04h)
LINEINVOL (Reg 10h)
MICVOL (Reg 0Eh)
RECORD
GAIN
(Reg 1Ch)
VREF
RECORD
SELECT
(Reg 1Ah)
LINEOUTL
LINEOUTR
MASTER VOL
(Reg 02h)
AUX
VID
CONTROL LOGIC
P
E
NDE
T
SP
EN
/I
2
S
CI
D
EAP
D
/
B
U
SY
SPD
I
F
M
ASK
/L
R
C
SAR
ADC
AC'97
INTERFACE
0/20
dB
MIC BOOST
(Reg 0Eh)
M
U
X
VID
AUX
MIC2
MIC1
M
U
X
M
U
X
HPOUTL
headset autodetect
CDR
CDL
LINEINR
LINEINL
CDGND
MIC SELECT
(Reg 20h)
ADC
R
ADC
L
VID
AUX
PD
R
E
S
PCBEEP
POP
(Reg 20h)
MIXVOL
(Reg 72h)
CX3D1 CX3D2
MP
M
(R
e
g
5
Ah)
M
U
X
HPND
(Reg 5Ch)
MONO VOL
(Reg 06h)
MONO_OUT
(TX)
M
U
X
M
U
X
MIX
(Reg 20h)
PSEL
(Reg 5Ch)
3D
PH
O
N
E
(RX)
PHONE
PHONE
(Reg 0Ah)
(Reg 0Ch)
MUX
ADCNDAC
(Reg 5Ch)
CDVOL (Reg 12h)
DVDD2
DGND2
BMON
24.576MHz
A
V
DD1
AG
N
D
1
WM9705
Production Data
w
PD Rev 4.0 December 2003
2
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
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
SPDIF OR I
2
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
WM9705
Production Data
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PD Rev 4.0 December 2003
3
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
WM9705
Production Data
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PD Rev 4.0 December 2003
4
ORDERING INFORMATION
DEVICE
TEMP. RANGE
PACKAGE
MOISTURE
SENSITIVITY LEVEL
XWM9705EFT/V
-25 to 85
o
C
48-pin TQFP
MSL1
WM9705SEFT/V
-25 to 85
o
C
48-pin TQFP
(lead free)
MSL1
XWM9705EFT/RV
-25 to 85
o
C
48-pin TQFP
(tape and reel)
MSL1
WM9705SEFT/RV
-25 to 85
o
C
48-pin TQFP
(lead free, tape and reel)
MSL1
DEVICE
TEMP. RANGE
PACKAGE
MOISTURE
SENSITIVITY LEVEL
XWM9705EFL/V
-25 to 85
o
C
48-pin QFN
MSL3
WM9705SEFL/V
-25 to 85
o
C
48-pin QFN
(lead free)
MSL3
XWM9705EFL/RV
-25 to 85
o
C
48-pin QFN
(tape and reel)
MSL3
WM9705SEFL/RV
-25 to 85
o
C
48-pin QFN
(lead free, tape and reel)
MSL3
Note:
Reel quantity = 2,200
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
MIN
MAX
Digital supply voltage
-0.3V
+7V
Analogue supply voltage
-0.3V
+7V
Voltage range digital inputs
DVSS
-0.3V
DVDD +0.3V
Voltage range analogue inputs
AVDD
-0.3V
AVDD +0.3V
Operating temperature range, T
A
-25
o
C
+85
o
C
Storage temperature after soldering
-65
o
C
+150
o
C
Package body temperature (soldering 10 seconds)
+240
o
C
Package body temperature (soldering 2 minutes)
+183
o
C
WM9705
Production Data
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PD Rev 4.0 December 2003
5
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Digital supply range
DVDD1, DVDD2
2.7
5.5
V
Analogue supply range
AVDD1, AVDD2
2.7
5.5
V
Digital ground
DGND1, DGND2
0
V
Analogue ground
AGND1, AGND2,
HPGND
0
V
Difference AGND to DGND Note 1
-0.3
0
+0.3
V
Difference AVDD to DVDD Note 2
-0.3
5.5
V
Note:
1.
AGND is normally the same as DGND and HPGND
2.
AVDD should be greater than or equal to DVDD
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