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WM8945ECS/R Datasheet(PDF) 102 Page - Wolfson Microelectronics plc

Part # WM8945ECS/R
Description  Mono Low-Power CODEC with Video Buffer and Touch Panel Controller
PDF  169 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8945ECS/R Datasheet(HTML) 102 Page - Wolfson Microelectronics plc

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WM8945
Production Data
w
PD, May 2011, Rev 4.1
102
Figure 47 4-Wire Readback (Open Drain)
POWER MANAGEMENT
The WM8945 has two control registers that allow users to select which functions are active. For
minimum power consumption, unused functions should be disabled. To minimise pop or click noise,
it is important to enable or disable these functions in the correct order, and to use the signal mute
registers as part of a carefully structured control sequence. Refer to the “Recommended Power
Up/Down Sequence” section for more details.
The power management control registers are described in Table 68.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R2 (02h)
Power
management
1
12
INPPGAL_ENA
0
Left Input PGA Enable
0 = Disabled
1 = Enabled
10
ADCL_ENA
0
Left ADC and Record filter Enable
0 = Disabled
1 = Enabled
ADCL_ENA must be set to 1 when
processing left channel data from
the ADC or Digital Microphone.
4
MICB_ENA
0
Microphone Bias Enable
0 = Disabled
1 = Enabled
3
BIAS_ENA
0
Master Bias Enable
0 = Disabled
1 = Enabled
R3 (03h)
Power
management
2
14
OUTL_ENA
0
LINEOUTL enable
0 = Disabled
1 = Enabled
13
SPKR_PGA_
ENA
0
Speaker Right PGA enable
0 = Disabled
1 = Enabled
12
SPKL_PGA_
ENA
0
Speaker Left PGA enable
0 = Disabled
1 = Enabled
11
SPKR_SPKVDD
_ENA
0
SPKOUTR enable
0 = Disabled
1 = Enabled
Note that SPKOUTR is also
controlled by SPKR_OP_ENA.
When powering down SPKOUTR,
the SPKR_SPKVDD_ENA bit
should be reset first.



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