WM8978 Datasheet, PDF (4/78 Pages) Wolfson Microelectronics plc – STEREO CODEC WITH SPEAKER DRIVER

WM8978
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PIN DESCRIPTION
PIN
NAME
1
LIP
2
LIN
3
L2/GPIO2
4
RIP
5
RIN
6
R2/GPIO3
7
LRC
8
BCLK
9
ADCDAT
10
DACDAT
11
MCLK
12
DGND
13
DCVDD
14
DBVDD
15
CSB/GPIO1
16
SCLK
17
SDIN
18
MODE
19
AUXL
20
AUXR
21
OUT4
22
OUT3
23
ROUT2
24
SPKGND
25
LOUT2
26
SPKVDD
27
VMID
28
AGND
29
ROUT1
30
LOUT1
31
AVDD
32
MICBIAS
TYPE
Analogue input
Analogue input
Analogue input
Analogue input
Analogue input
Analogue input
Digital Input / Output
Digital Input / Output
Digital Input
Digital Input
Digital Input
Supply
Supply
Supply
Digital Input / Output
Digital Input / Output
Digital Input / Output
Digital Input
Analogue input
Analogue input
Analogue Output
Analogue Output
Analogue Output
Supply
Analogue Output
Supply
Reference
Supply
Analogue Output
Analogue Output
Supply
Analogue Output
DESCRIPTION
Left Mic Pre-amp positive input
Left Mic Pre-amp negative input
Left channel line input/secondary mic pre-amp positive input/GPIO pin
Right Mic Pre-amp positive input
Right Mic Pre-amp negative input
Right channel line input/secondary mic pre-amp positive input/GPIO pin
DAC and ADC Sample Rate Clock
Digital Audio Port Clock
ADC Digital Audio Data Output
DAC Digital Audio Data Input
Master Clock Input
Digital ground
Digital core logic supply
Digital buffer (I/O) supply
3-Wire MPU Chip Select / General purpose input/output 1
3-Wire MPU Clock Input / 2-Wire MPU Clock Input
3-Wire MPU Data Input / 2-Wire MPU Data Input
Control Interface Selection
Left Auxillary input
Right Auxillary input
Buffered midrail Headphone pseudo-ground, or Right line output or MONO
mix output
Buffered midrail Headphone pseudo-ground, or Left line output
Second right output, or BTL speaker driver positive output
Speaker ground (feeds speaker amp and OUT3/OUT4)
Second left output, or BTL speaker driver negative output
Speaker supply (feed speaker amp only)
Decoupling for ADC and DAC reference voltage
Analogue ground (feeds ADC and DAC)
Headphone Output Right
Headphone Output Left
Analogue supply (feeds ADC and DAC)
Microphone Bias
Note:
It is recommended that the QFN ground paddle should be connected to analogue ground on the application PCB.
w
PP Rev 1.7 January 2005
4