WM8746
Production Data
MODES OF OPERATION
Control of the various modes of operation for the WM8746 is either by software control over the serial
interface ,or by hard-wired pin control. Selection of software or hardware mode is via the MODE pin.
The following functions may be controlled either via the serial control interface or by hard wiring of
the appropriate pins.
SOFTWARE CONTROL
DEFAULT VALUE
PIN 8: MODE = 0
HARDWARE CONTROL
BEHAVIOUR
FUNCTION
OPTIONS
PIN 8: MODE = 1
Input audio data format
Right justified
FMT = 00 (default)
FMT = 01
Pin 12, 13: ML/I2S, MC/IWL = 00, 01 or 10
Not available in hardware mode
Pin 12, 13: ML/I2S, MC/IWL = 11
Not available in hardware mode
Pin 12, 13: ML/I2S, MC/IWL = 00 (RJ)
Pin 12, 13: ML/I2S, MC/IWL = 01 (RJ)
Pin 12, 13: ML/I2S, MC/IWL = 10 (RJ)
Pin 12, 13: ML/I2S, MC/IWL = 11 (I2S)
Pin 14: MD/DM = 1
Left justified
I2S format
FMT = 10
DSP formats
FMT = 11
Input word length
16
20
24
32
On
Off
IWL[1:0] = 00
IWL[1:0] = 01
IWL[1:0] = 10 (default)
IWL[1:0] = 11
DEEMPH = 1
De-emphasis selection
Mute
DEEMPH = 0 (Default)
Pin 14: MD/DM = 0
On
Off
MUTE = 1
Pin 9: MUTE = 1
Pin 9: MUTE = 0
MUTE = 0 (default)
Input LRCIN polarity
Volume control
Normal
LRP = 0 (default)
LRP = 1
Not available in hardware mode,
default value set
Inverted
Lch, Rch
individually
ATC = 0; 0dB (default)
Not available in hardware mode,
gain defaults to 0dB
Lch, Rch
common
ATC = 1
Infinite zero detect
On
Off
IZD = 1
Automute function controlled from MUTE pin
low = never mute
IZD = 0 (default)
floating = automute enable
high = mute
Power down
Chip on
Chip off
PWDN = 0 (default)
PWDN = 1
Run SCKI
Stop SCKI
DAC output control
See Table 6 Default is PL[3:0] = 1001, stereo mode
for all options
Not available in hardware mode
Table 5 Control Function Summary
March 2006, PD Rev 4.0
14
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
