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CS47L85 Datasheet(PDF) 357 Page - Cirrus Logic

Part # CS47L85
Description  Low-Power Smart Codec with Seven DSP Cores, Voice and Media Enhancement, and Integrated Sensor Hub
PDF  370 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS47L85 Datasheet(HTML) 357 Page - Cirrus Logic

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CS47L85
Rev 4.3
357
CS47L85
HPOUT1L
HPOUT1R
HPOUT1FB1
JACKDETn
MICDET1
Note: The illustrated circuit assumes
the jack insertion switch contacts are
closed when jack is inserted.
* Note that the IN1B or IN2B analogue
mic channel is recommended with the
external accessory detect function
(jack insertion switch)
MICBIASn
2.2k
 (+/-2%)
C
* IN1BP, IN2BLP, IN2BR
A series resistor (eg. 500k
) is recommended on
JACKDET2, in order to reduce leakage current.
Figure 97 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 CS47L85 can detect the presence of a typical microphone and up to 6 push-buttons, using the components shown in
Figure 98. 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 98 External Accessory Detect Connection



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