wm8940gefl-v Wolfson Microelectronics plc, wm8940gefl-v Datasheet - Page 46

• Manufacturer Part Number: wm8940gefl-v
• Description: Mono Codec With Speaker Driver
• Manufacturer: Wolfson Microelectronics plc

WM8940
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Table 35 SPKOUT Volume Control
ZERO CROSS TIMEOUT
Table 36 Timeout Clock Enable Control
MONO MIXER AND OUTPUT
A zero-cross timeout function is also provided so that if zero cross is enabled on the input or output
PGAs the gain will automatically update after a timeout period if a zero cross has not occurred. This
is enabled by setting SLOWCLKEN. The timeout period is either 31Hz or 47Hz.
The MONOOUT pin can drive a 16Ω or 32Ω headphone or a line output or be used as a DC
reference for a headphone output (see Headphone Output section). It can be selected to drive out
any combination of DAC, Bypass (output of input BOOST stage) and AUX. This output is enabled
by setting bit MONOEN.
R54
Speaker
volume control
R7
Additional
control
REGISTER
REGISTER
ADDRESS
ADDRESS
7
6
5:0
0
BIT
BIT
SPKZC
SPKMUTE
SPKVOL
[5:0]
SLOWCLKEN
LABEL
LABEL
0
DEFAULT
0
1
111001
(0dB)
DEFAULT
Slow clock enable. Used for both the jack
insert detect de-bounce circuit and the
zero cross timeout.
0 = slow clock disabled
1 = slow clock enabled
Speaker Volume control zero cross
enable:
1 = Change gain on zero cross only
0 = Change gain immediately
Speaker output mute enable
0=Speaker output enabled
1=Speaker output muted (VMIDOP)
Speaker Volume Adjust
111111 = +6dB
111110 = +5dB
… (1.0 dB steps)
111001=0dB
…
000000=-57dB
DESCRIPTION
DESCRIPTION
PD, Rev 4.2, April 2008
Production Data
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