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WM8281ECS/R Datenblatt(PDF) 381 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) 381 Page - Cirrus Logic

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WM8281
Rev 4.0
381
WM8281
HPOUT1L
HPOUT1R
HPOUT1FB1
JACKDET
MICDET1
Note: The illustrated circuit assumes
the jack insertion switch contacts are
closed when jack is inserted.
* Note that the Right analogue mic
channel is recommended with the
external accessory detect function
(jack insertion switch)
MICBIASn
2.2k
 (+/-2%)
C
* INnRP
Figure 93 External Accessory Detection
The accessory detection circuit measures the impedance of an external load connected to one of the
MICDET pins.
The microphone detection circuit uses MICVDD, MICBIAS1, MICBIAS2 or MICBIAS3 as a reference.
The applicable source is configured using the MICD_BIAS_SRC register.
The WM8281 can detect the presence of a typical microphone and up to 6 push-buttons, using the
components shown in Figure 94. When the microphone detection circuit is enabled, then each of the
push-buttons shown will cause a different bit within the MICD_LVL register to be set.
The microphone detect function is specifically designed to detect a video accessory (typical 75
) load
if required. A measured external impedance of 75
 will cause the MICD_LVL [3] bit to be set.
The measured impedance is reported using the MICD_STS and MICD_LVL bits.
When no accessory or push-button is detected, the MICD_STS bit is set to 0.
When MICD_STS = 1, then one of the MICD_LVL bits is set to indicate the measured impedance.
The applicable MICD_LVL bit for each push-button is noted below.
Detection of the microphone alone (no push-buttons closed) is indicated in MICD_LVL[8].
MICDET
AGND
MICBIAS
2.2k
(+/-2%)
Microphone:
475
 to 30k
Push-buttons
18
22
33
82
220
Analogue Input
C
Figure 94 External Accessory Detect Connection



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