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DESCRIPTION
The WM9715L is a highly integrated input / output device
designed for mobile computing and communications. The
device can connect directly to a 4-wire or 5-wire touchpanel,
mono or stereo microphones, stereo headphones and a
mono speaker, reducing total component count in the
system. Additionally, phone input and output pins are
provided for seamless integration with wireless
communication devices.
The WM9715L also offers up to four auxiliary ADC inputs
for analogue measurements such as temperature or light.
To monitor the battery voltage in portable systems, the
WM9715L has two uncommitted comparator inputs.
All device functions are accessed and controlled through a
single AC-Link interface compatible with the AC’97 standard
(rev 2.2). Additionally, the WM9715L can generate
interrupts to indicate pen down, pen up, availability of
touchpanel data, low battery, and dead battery.
The WM9715L operates at supply voltages from 1.8 to 3.6
Volts. Each section of the chip can be powered down under
software control to save power. The device is available in a
small leadless 7x7mm QFN package, ideal for use in hand-
held portable systems.
WM9715L
AC’97 Audio and Touchpanel CODEC
FEATURES
•
AC’97 Rev 2.2 compatible stereo codec
- DAC SNR 90dB, THD –86dB
- ADC SNR 88dB, THD –88dB
- Variable Rate Audio, supports all WinCE sample rates
- Tone Control, Bass Boost and 3D Enhancement
•
On-chip 45mW headphone driver
•
On-chip 400mW mono speaker driver
•
Stereo, mono or differential microphone input
- Automatic Level Control (ALC)
•
Auxiliary mono DAC (ring tone or DC level generation)
•
Seamless interface to wireless chipset
•
Resistive touchpanel interface
- Supports 4-wire and 5-wire panels
- 12-bit resolution, INL
±3
LSBs (<0.5 pixels)
- X, Y and touch-pressure (Z) measurement
- Pen-down detection supported in Sleep Mode
•
2 comparator inputs for battery monitoring
•
Up to 4 auxiliary ADC inputs
•
1.8V to 3.6V supplies
•
7x7mm QFN
APPLICATIONS
•
Personal Digital Assistants (PDA)
•
Smartphones
•
Handheld and Tablet Computers
BLOCK DIAGRAM
Y-/BL
XTLOUT
X-/TL
PENDOWN
X+/BR
Y+/TR
TPGND
TPVDD
BITCLK
SYNC
SDATAIN
SDATAOUT
RESETB
WIPER/
AUX4
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SPDIF_OUT
ADCIRQ
GENIRQ
XTLIN
Production Data, December 2007, Rev 4.0
Copyright
©2007
Wolfson Microelectronics plc.
WM9715L
TABLE OF CONTENTS
Production Data
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
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Production Data
WM9715L
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
INTERRUPT CONTROL.......................................................................................51
THE ADCIRQ PIN ........................................................................................................ 51
THE PENDOWN PIN ................................................................................................... 51
THE GENIRQ PIN........................................................................................................ 51
POWER MANAGEMENT .....................................................................................54
UNUSED ANALOGUE INPUTS AND OUTPUTS ......................................................... 57
AC97 DATA AND CONTROL INTERFACE .........................................................58
INTERFACE PROTOCOL............................................................................................ 58
INTERFACE TIMING ................................................................................................... 59
REGISTER MAP...................................................................................................62
REGISTER BITS BY ADDRESS .................................................................................. 63
APPLICATIONS INFORMATION .........................................................................72
RECOMMENDED EXTERNAL COMPONENTS........................................................... 72
RECOMMENDED COMPONENTS VALUES ............................................................... 73
LINE OUTPUT ............................................................................................................. 73
AC-COUPLED HEADPHONE OUTPUT....................................................................... 74
DC COUPLED (CAPLESS) HEADPHONE OUTPUT ................................................... 74
BTL LOUDSPEAKER OUTPUT ................................................................................... 75
COMBINED STEREO HEADSET / BTL EAR SPEAKER ............................................. 75
COMBINED HEADSET / SINGLE-ENDED EAR SPEAKER......................................... 75
PACKAGE DIMENSIONS ....................................................................................76
IMPORTANT NOTICE ..........................................................................................77
ADDRESS:................................................................................................................... 77
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PD Rev 4.0 December 2007
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WM9715L
PIN CONFIGURATION
Production Data
ORDERING INFORMATION
DEVICE
WM9715LGEFL/V
WM9715LGEFL/RV
Note:
Reel quantity = 2,200
TEMP. RANGE
-25 to +85
o
C
-25 to +85
o
C
PACKAGE
48-lead QFN
(Pb-free)
48-lead QFN
(Pb-free, tape and reel)
MOISTURE LEVEL
SENSITIVITY
MSL3
MSL3
PEAK SOLDERING
TEMP
260
o
C
260
o
C
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PD Rev 4.0 December 2007
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Production Data
WM9715L
NAME
DBVDD
XTLIN
XTLOUT
DGND1
SDATAOUT
BITCLK
DGND2
SDATAIN
DCVDD
SYNC
RESETB
WIPER / AUX4
TPVDD
X+/BR
Y+/TR
X-/TL
Y-/BL
TPGND
PCBEEP
PHONE
MIC1
MIC2
LINEINL
LINEINR
AVDD
AGND
VREF
MICBIAS
COMP1 / AUX1
COMP2 / AUX2
BMON / AUX3
CAP2
MONOOUT
SPKGND
LOUT2
ROUT2
OUT3
SPKVDD
HPOUTL
HPGND
HPOUTR
AGND2
HPVDD
DNC
GENIRQ
PENDOWN
ADCIRQ
SPDIF_OUT
TYPE
Supply
Digital Input
Digital Output
Supply
Digital Input
Digital Output
Supply
Digital Output
Supply
Digital Input
Digital Input
Analogue Input
Supply
Analogue Input
Analogue Input
Analogue Input
Analogue Input
Supply
Analogue Input
Analogue Input
Analogue Input
Analogue Input
Analogue Input
Analogue Input
Supply
Supply
Analogue Output
Analogue Output
Analogue Input
Analogue Input
Analogue Input
Analogue In / Out
Analogue Output
Supply
Analogue Output
Analogue Output
Analogue Output
Supply
Analogue Output
Supply
Analogue Output
Supply
Supply
Do not connect
Digital In / Out
Digital Output
Digital In / Out
Digital In / Out
Digital I/O Buffer Supply
Clock Crystal Connection 1 / External Clock Input
Clock Crystal Connection 2
Digital Ground (return path for both DCVDD and DBVDD)
Serial Data Output from Controller / Input to WM9715L
Serial Interface Clock Output to Controller
Digital Ground (return path for both DCVDD and DBVDD)
Serial Data Input to Controller / Output from WM9715L
Digital Core Supply
Serial Interface Synchronisation Pulse from Controller
Reset (asynchronous, active Low, resets all registers to their default)
Top Sheet Connection for 5-wire Touchpanels / Auxiliary ADC Input
Touchpanel Driver Supply
Touchpanel Connection: X+ (Right) for 4-wire / bottom right for 5-wire
Touchpanel Connection: Y+ (Top) for 4-wire / top right for 5-wire
Touchpanel Connection: X- (Left) for 4-wire / top left for 5-wire
Touchpanel Connection: Y- (Bottom) for 4-wire / bottom left for 5-wire
Touchpanel Driver Ground
Line Input to analogue audio mixers, typically used for beeps
Phone Input (RX)
Left Microphone or Microphone 1 Input
Right Microphone or Microphone 2 Input
Left Line Input
Right Line Input
Analogue Supply (feeds audio DACs, ADCs, PGAs, mic boost,
mixers)
Analogue Ground
Internal Reference Voltage (buffered CAP2)
Bias Voltage for Microphones (buffered CAP2
×
1.8)
Comparator 1 (dead battery alarm) / Auxiliary ADC Input 1
Comparator 2 (low battery alarm) / Auxiliary ADC Input 2
Battery Monitor Input / Auxiliary ADC Input 3
Internal Reference Voltage (normally AVDD/2, if not overdriven)
Mono Output, intended for Phone TX signal
Speaker Ground (feeds output buffers on pins 35 and 36)
Left Output 2 (Speaker, Line or Headphone)
Right Output 2 (Speaker, Line or Headphone)
Analogue Output 3 (from AUXDAC or headphone pseudo-ground)
Speaker Supply (feeds output buffers on pins 35 and 36)
Headphone Left Output
Headphone Ground (feeds output buffers on pins 37, 39, 41)
Headphone Right Output
Analogue Ground, Chip Substrate
Headphone Supply (feeds output buffers on pins 37, 39, 41)
Leave this pin unconnected
General IRQ (Interrupt Request) Output
Indicates that screen is being touched
AUXADC “data ready” interrupt; also determines power up status.
(See “Power Management” and “Applications” sections)
SPDIF Digital Audio Output
DESCRIPTION
PIN DESCRIPTION
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
Note:
It is recommended that the QFN ground paddle should be connected to analogue ground on the application PCB.
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Embedded System
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