WM8940
Pre-Production
REGISTER
ADDRESS
BIT
5:0
LABEL
DEFAULT
DESCRIPTION
REFER TO
INPPGAVOL
010000
Input PGA volume
000000 = -12dB
000001 = -11.25db
.
Input Signal Path
010000 = 0dB
.
111111 = 35.25dB
Reserved
46 (2Eh)
47 (2Fh)
15:0
15:9
8
0000h
00h
0
Reserved
PGABOOST
Input Boost
Input Signal Path
Input Signal Path
0 = PGA output has +0dB gain through input BOOST
stage.
1 = PGA output has +20dB gain through input BOOST
stage.
7
0
Reserved
6:4
MICP2BOOSTVOL 000
Controls the MICP pin to the input boost stage (NB,
when using this path set MICP2INPPGA=0):
000=Path disabled (disconnected)
001=-12dB gain through boost stage
010=-9dB gain through boost stage
…
111=+6dB gain through boost stage
Reserved
3
0
2:0
AUX2BOOSTVOL 000
Controls the auxiliary amplifier to the input boost
stage:
Input Signal Path
000=Path disabled (disconnected)
001=-12dB gain through boost stage
010=-9dB gain through boost stage
…
111=+6dB gain through boost stage
Reserved
48 (30h)
49 (31h)
15:0
15:2
1
0000h
0000h
1
Reserved
TSDEN
VROI
Thermal Shutdown Enable
0 : thermal shutdown disabled
1 : thermal shutdown enabled
Output Switch
0
0
VREF (AVDD/2 or 1.5xAVDD/2) to analogue output
resistance
Analogue Outputs
0: approx 1kΩ
1: approx 30 kΩ uthorize
50 (32h)
15:6
5
000h
0
Reserved
AUX2SPK
Output of auxiliary amplifier to speaker mixer input
Analogue Outputs
0 = not selected
1 = selected
Reserved
4:2
1
000
0
BYP2SPK
DAC2SPK
Bypass path (output of input boost stage) to speaker
mixer input
Analogue Outputs
Analogue Outputs
0 = not selected
1 = selected
0
0
Output of DAC to speaker mixer input
0 = not selected
1 = selected
51 (33h)
52 (34h)
53 (35h)
15:0
15:0
15:0
0000h
0000h
0000h
Reserved
Reserved
Reserved
Pre-Production, Rev 3.0, February 2007
76
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
