Production Data
WM8903
PIN DESCRIPTION
PIN
1
NAME
DGND
MCLK
TYPE
DESCRIPTION
Digital ground (return path for DCVDD and DBVDD)
Master clock for CODEC
Supply
Digital Input
2
Digital Input/Output
GPIO2 / Digital microphone data input
3
GPIO2/
DMIC_DAT
Digital Input/Output
GPIO1 / Digital microphone clock output
4
GPIO1/
DMIC_LR
Digital Output
Digital Input/Output
Digital Input
Interrupt output / GPIO4
5
INTERRUPT
BCLK
Audio interface bit clock / GPIO5
DAC digital audio data
6
7
DACDAT
LRC
Digital Input/Output
Digital Output
Supply
Audio interface left / right clock (common for ADC and DAC)
ADC digital audio data
8
9
ADCDAT
CPVDD
CFB1
Charge pump power supply
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Analogue Output
Supply
Charge pump flyback capacitor pin
Charge pump ground
CPGND
CFB2
Analogue Output
Analogue Output
Analogue Output
Analogue Output
Analogue Input
Analogue Output
Analogue Output
Analogue Input
Analogue Output
Analogue Output
Analogue Output
Supply
Charge pump flyback capacitor pin
Charge pump positive supply decoupling (powers HPOUTL/R, LINEOUTL/R)
Charge pump negative supply decoupling (powers HPOUTL/R, LINEOUTL/R)
Right headphone output (line or headphone output)
Headphone ground
VPOS
VNEG
HPOUTR
HPGND
HPOUTL
LINEOUTR
LINEGND
LINEOUTL
LOP
Left headphone output (line or headphone output)
Right line output 1 (line output)
Line-out ground
Left line output 1 (line output)
Left differential output positive side
Left differential output negative side
LON
Analogue power supply (powers analogue inputs, reference, ADC, DAC, LOP,
LON, ROP, RON)
AVDD
Analogue Output
Supply
Midrail voltage decoupling capacitor
Analogue power return
25
26
27
28
29
30
31
32
33
34
35
36
37
38
VMID
AGND
RON
Analogue Output
Analogue Output
Analogue Output
Analogue Input
Analogue Input
Analogue Input
Analogue Input
Analogue Input
Analogue Input
Digital Input/Output
Digital Input
Right differential output negative side
Right differential output positive side
Microphone bias
ROP
MICBIAS
IN3R
Right channel input 3
Right channel input 2
IN2R
Right channel input 1
IN1R
Left channel input 3
IN3L
Left channel input 2
IN2L
Left channel input 1
IN1L
Control interface data Input / 2-wire acknowledge output
Control interface clock Input
GPIO3 / control interface address selection
SDIN
SCLK
Digital Input/Output
GPIO3
/ADDR
Supply
Supply
Digital core supply
39
40
DCVDD
DBVDD
Digital buffer supply (powers audio interface and control interface)
PD, Rev 4.5, June 2012
7
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
