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PDF WM9712L Data sheet ( Hoja de datos )
| Número de pieza | WM9712L | |
| Descripción | AC97 Audio and Touchpanel CODEC | |
| Fabricantes | Wolfson Microelectronics plc | |
| Logotipo |  |
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WM9712L
AC’97 Audio and Touchpanel CODEC
DESCRIPTION
The WM9712L 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 WM9712L also offers up to four auxiliary ADC inputs
for analogue measurements such as temperature or light,
and five GPIO pins for interfacing to buttons or other digital
devices. To monitor the battery voltage in portable systems,
the WM9712L has two uncommitted comparator inputs.
All device functions are accessed and controlled through a
single AC-Link interface compliant with the AC’97 standard.
Additionally, the WM9712L can generate interrupts to
indicate pen down, pen up, availability of touchpanel data,
low battery, dead battery, and GPIO conditions.
The WM9712L 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, or in the industry standard 48-pin
TQFP package.
BLOCK DIAGRAM
FEATURES
• AC’97 Rev 2.2 compatible stereo codec
- DAC SNR 94dB, THD –87dB
- ADC SNR 92dB, THD –87dB
- 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 ±2 LSBs (<0.5 pixels)
- X, Y and touch-pressure (Z) measurement
- Pen-down detection supported in Sleep Mode
• Up to 5 GPIO pins
• 2 comparator inputs for battery monitoring
• Up to 4 auxiliary ADC inputs
• 1.8V to 3.6V supplies
• 7x7mm QFN or 48-pin TQFP package options
APPLICATIONS
• Personal Digital Assistants (PDA)
• Smartphones
• Handheld and Tablet Computers
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Production Data, December 2003, Rev 4.0
Copyright 2003 Wolfson Microelectronics plc.
1 page  
Production Data
PIN DESCRIPTION
PIN NAME
1 DBVDD
2 XTLIN
3 XTLOUT
4 DGND1
5 SDATAOUT
6 BITCLK
7 DGND2
8 SDATAIN
9 DCVDD
10 SYNC
11 RESETB
12 WIPER / AUX4
13 TPVDD
14 X+/BR
15 Y+/TR
16 X-/TL
17 Y-/BL
18 TPGND
19 PCBEEP
20 PHONE
21 MIC1
22 MIC2
23 LINEINL
24 LINEINR
25 AVDD
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
26 AGND
Supply
27
VREF
Analogue Output
28
MICBIAS
Analogue Output
29
COMP1 / AUX1
Analogue Input
30
COMP2 / AUX2
Analogue Input
31
BMON / AUX3
Analogue Input
32
CAP2
Analogue In / Out
33
MONOOUT
Analogue Output
34 SPKGND
Supply
35
LOUT2
Analogue Output
36
ROUT2
Analogue Output
37
OUT3
Analogue Output
38 SPKVDD
Supply
39
HPOUTL
Analogue Output
40 HPGND
Supply
41
HPOUTR
Analogue Output
42 AGND2
Supply
43 HPVDD
Supply
44
GPIO1
Digital In / Out
45
GPIO2 / IRQ
Digital In / Out
46 GPIO3 / PENDOWN Digital In / Out
47 GPIO4 / ADA / MASK Digital In / Out
48 GPIO5 / SPDIF_OUT Digital In / Out
WM9712L
DESCRIPTION
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 WM9712L
Serial Interface Clock Output to Controller
Digital Ground (return path for both DCVDD and DBVDD)
Serial Data Input to Controller / Output from WM9712L
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 Left Output
Analogue Ground, Chip Substrate
Headphone Supply (feeds output buffers on pins 37, 39, 41)
GPIO Pin 1
GPIO Pin 2 or IRQ (Interrupt Request) Output
GPIO Pin 3 or Pen Down Output
GPIO Pin 4 or ADA (ADC Data Available) Output or Mask input
GPIO Pin 5 or SPDIF Digital Audio Output
w
PD Rev 4.0 December 2003
5
5 Page 
Production Data
HEADPHONE / SPEAKER OUTPUT THD VERSUS POWER
-20
Headphone Power vs THD+N (32Ohm load)
-40
-60
-80
-100
0
5 10 15 20 25 30
Power (mW)
-20
Headphone Power vs THD+N (16Ohm load)
-40
-60
-80
-100
0
10 20 30 40 50 60
Power (mW)
WM9712L
w
PD Rev 4.0 December 2003
11
11 Page | ||
| Páginas | Total 70 Páginas | |
| PDF Descargar | [ Datasheet WM9712L.PDF ] | |
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