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WM8281ECS/R Scheda tecnica(PDF) 211 Page - Cirrus Logic

Il numero della parte WM8281ECS/R
Spiegazioni elettronici  Low Power Audio System with Ambient Noise Cancellation and Echo Cancellation
PDF  392 Pages
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Produttore elettronici  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8281ECS/R Scheda tecnica(HTML) 211 Page - Cirrus Logic

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WM8281
Rev 4.0
211
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
5:4
MICD_BIAS_SRC
[1:0]
00
Accessory Detect (MICDET) reference
select
00 = MICVDD
01 = MICBIAS1
10 = MICBIAS2
11 = MICBIAS3
1
MICD_DBTIME
1
Mic Detect De-bounce
0 = 2 measurements
1 = 4 measurements
Only valid when ACCDET_MODE=000.
0
MICD_ENA
0
Mic Detect Enable
0 = Disabled
1 = Enabled
R676
(02A4h)
Mic Detect 2
7:0
MICD_LVL_SEL
[7:0]
1001_
1111
Mic Detect Level Select
(enables Mic/Accessory Detection in
specific impedance ranges)
[7] = Enable >475 ohm detection
[6] = Not used - must be set to 0
[5] = Not used - must be set to 0
[4] = Enable 375 ohm detection
[3] = Enable 155 ohm detection
[2] = Enable 73 ohm detection
[1] = Enable 40 ohm detection
[0] = Enable 18 ohm detection
Note that the impedance values quoted
assume that a microphone (475ohm-
30kohm) is also present on the MICDET
pin.
Only valid when ACCDET_MODE=000.
R677
(02A5h)
Mic Detect 3
10:2
MICD_LVL [8:0]
0_0000_
0000
Mic Detect Level
(indicates the measured impedance)
[8] = >475 ohm, <30k ohm
[7] = Not used
[6] = Not used
[5] = 375 ohm
[4] = 155 ohm
[3] = 73 ohm
[2] = 40 ohm
[1] = 18 ohm
[0] = <3 ohm
Note that the impedance values quoted
assume that a microphone (475ohm-
30kohm) is also present on the MICDET
pin.
Only valid when ACCDET_MODE=000.
1
MICD_VALID
0
Mic Detect Data Valid
0 = Not Valid
1 = Valid
0
MICD_STS
0
Mic Detect Status
0 = No Mic/Accessory present
(impedance is >30k ohm)
1 = Mic/Accessory is present
(impedance is <30k ohm)
Only valid when ACCDET_MODE=000.
R683
02ABh
Mic Detect 4
15:8
MICDET_ADCVA
L_DIFF [7:0]
00h
Mic Detect ADC Level (Difference)
Only valid when ACCDET_MODE=111.
6:0
MICDET_ADCVA
L [6:0]
00h
Mic Detect ADC Level
Only valid when ACCDET_MODE=111.



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