WM8978 Wolfson Microelectronics Ltd., WM8978 Datasheet - Page 86

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WM8978

Manufacturer Part Number
WM8978
Description
The WM8978 is a low power, high quality stereo codec designed for portable applications such as Digital still camera or Digital Camcorde
Manufacturer
Wolfson Microelectronics Ltd.
Datasheet

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WM8978
w
9 (09h)
10 (0Ah)
11 (0Bh)
12 (0Ch)
REGISTER
ADDRESS
8:7
6
5:4
8:7
6
5:4
3
2
1
0
8
7:0
8
7:0
BIT
JD_VMID
JD_EN
JD_SEL
SOFTMUTE
DACOSR128
AMUTE
DACPOLR
DACPOLL
DACVU
DACVOLL
DACVU
DACVOLR
LABEL
00
0
00
00
0
00
0
0
0
0
N/A
11111111
N/A
11111111
DEFAULT
[7] VMID_EN_0
[8] VMID_EN_1
Jack Detection Enable
0=disabled
1=enabled
Pin selected as jack detection input
00 = GPIO1
01 = GPIO2
10 = GPIO3
11 = Reserved
Reserved
Softmute enable:
0=Disabled
1=Enabled
Reserved
DAC oversample rate select
0 = 64x (lowest power)
1 = 128x (best SNR)
Automute enable
0 = Amute disabled
1 = Amute enabled
Right DAC output polarity:
0 = non-inverted
1 = inverted (180 degrees phase shift)
Left DAC output polarity:
0 = non-inverted
1 = inverted (180 degrees phase shift)
DAC left and DAC right volume do not update
until a 1 is written to DACVU (in reg 11 or 12)
Left DAC Digital Volume Control
0000 0000 = Digital Mute
0000 0001 = -127dB
0000 0010 = -126.5dB
... 0.5dB steps up to
1111 1111 = 0dB
DAC left and DAC right volume do not update
until a 1 is written to DACVU (in reg 11 or 12)
Right DAC Digital Volume Control
0000 0000 = Digital Mute
0000 0001 = -127dB
0000 0010 = -126.5dB
... 0.5dB steps up to
1111 1111 = 0dB
DESCRIPTION
PTD Rev 2.6 November 2005
Preliminary Technical Data
Output
Switching
(Jack Detect)
Output
Switching
(Jack Detect)
Output
Switching
(Jack Detect)
Output Signal
Path
Power
Management
Output Signal
Path
Output Signal
Path
Output Signal
Path
Analogue to
Digital
Converter
(ADC)
Analogue to
Digital
Converter
(ADC)
Output Signal
Path
Output Signal
Path
REFER TO
86