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WM8281ECS/R Datenblatt(PDF) 309 Page - Cirrus Logic

Teilenummer WM8281ECS/R
Bauteilbeschribung  Low Power Audio System with Ambient Noise Cancellation and Echo Cancellation
PDF  392 Pages
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Hersteller  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8281ECS/R Datenblatt(HTML) 309 Page - Cirrus Logic

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WM8281
Rev 4.0
309
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
0
CP2_ENA
1
Charge Pump 2 and LDO2 Control
(Provides analogue input and MICVDD
supplies)
0 = Disabled
1 = Enabled
R528
(0210h)
LDO1
Control 1
10:5
LDO1_VSEL [5:0]
0Ch
LDO1 Output Voltage Select
0Bh = 1.175V
0Ch = 1.200V
For normal operation, select 1.2V.
For sleep mode, select 1.175V as the last
register write before entering Sleep mode.
Under recommended operating conditions,
the LDO will return to 1.2V automatically
following Wake-Up from Sleep mode.
All other codes are Reserved
2
LDO1_DISCH
1
LDO1 Discharge
0 = LDOVOUT floating when disabled
1 = LDOVOUT discharged when disabled
0
LDO1_ENA
0
LDO1 Control
0 = Disabled
1 = Enabled
R531
(0213h)
LDO2
Control 1
10:5
LDO2_VSEL [5:0]
1Fh
LDO2 Output Voltage Select
00h = 0.900V
01h = 0.925V
02h = 0.950V
… (25mV steps)
13h = 1.375V
14h = 1.400V
15h = 1.500V
16h = 1.600V
… (100mV steps)
26h = 3.200V
27h to 3Fh = 3.300V
(See Table 126 for voltage range)
2
LDO2_DISCH
1
LDO2 Discharge
0 = MICVDD floating when disabled
1 = MICVDD discharged when disabled
R536
(218h)
Mic Bias
Ctrl 1
15
MICB1_EXT_CA
P
0
Microphone Bias 1 External Capacitor
(when MICB1_BYPASS = 0).
Configures the MICBIAS1 regulator
according to the specified capacitance
connected to the MICBIAS1 output.
0 = No external capacitor
1 = External capacitor connected
8:5
MICB1_LVL [3:0]
7h
Microphone Bias 1 Voltage Control
(when MICB1_BYPASS = 0)
0h = 1.5V
1h = 1.6V
… (0.1V steps)
Ch = 2.7V
Dh to Fh = 2.8V
3
MICB1_RATE
0
Microphone Bias 1 Rate (Bypass mode)
0 = Fast start-up / shut-down
1 = Pop-free start-up / shut-down
2
MICB1_DISCH
1
Microphone Bias 1 Discharge
0 = MICBIAS1 floating when disabled
1 = MICBIAS1 discharged when disabled



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