CS47L35 datasheet(156/300 Pages) CIRRUS

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156

DS1085F3

CS47L35

4.12 External Accessory Detection

The external connections for the microphone detect circuit are shown in Fig. 4-59. In typical applications, it can be used

to detect a microphone or button press.

Note that, when using the microphone detect circuit, it is recommended to use the IN1BLP or IN1BRP analog microphone

input paths to ensure best immunity to electrical transients arising from the external accessory.

R675 (0x02A3)

Mic_Detect_1

15:12 MICD_BIAS_

STARTTIME[3:0]

0001

Mic Detect Bias Start-up Delay (If MICBIAS is not enabled, this field selects the delay time

allowed for MICBIAS to start-up before performing the MICDET function.)

0000 = 0 ms (continuous)

0001 = 0.25 ms

0010 = 0.5 ms

0011 = 1 ms

0100 = 2 ms

0101 = 4 ms

0110 = 8 ms

0111 = 16 ms

1000 = 32 ms

1001 = 64 ms

1010 = 128 ms

1011 = 256 ms

1100 to 1111 = 512 ms

11:8 MICD_RATE[3:0]

0001

Mic Detect Rate (Selects the delay between successive MICDET measurements.)

0000 = 0 ms (continuous)

0001 = 0.25 ms

0010 = 0.5 ms

0011 = 1 ms

0100 = 2 ms

0101 = 4 ms

0110 = 8 ms

0111 = 16 ms

1000 = 32 ms

1001 = 64 ms

1010 = 128 ms

1011 = 256 ms

1100 to 1111 = 512 ms

6:4

MICD_BIAS_

SRC[2:0]

000

Accessory Detect (MICDET) reference select

000 = MICVDD

001 = MICBIAS1A

010 = MICBIAS1B

011 = MICBIAS2A

All other codes are reserved

MICD_DBTIME

Mic Detect Debounce

0 = 2 measurements

1 = 4 measurements

Only valid when ACCDET_MODE = 000.

MICD_ENA

Mic Detect Enable

0 = Disabled

1 = Enabled

R676 (0x02A4)

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 >1 k

 detection

[6] = Not used

[5] = Not used

[4] = Not used

[3] = Not used

[2] = Enable 360–680

 detection

[1] = Enable 210–290

 detection

[0] = Enable 110–180

 detection

Only valid when ACCDET_MODE = 000.

R677 (0x02A5)

Mic_Detect_3

10:2 MICD_LVL[8:0]

0000_

0000

Mic Detect Level (indicates the measured impedance)

[8] = >475

, <30 k

[7] = Not used

[6] = Not used

[5] = Not used

[4] = Not used

[3] = 360–680



[2] = 210–290



[1] = 110–180



[0] = 0–70



Only valid when ACCDET_MODE = 000.

MICD_VALID

Mic Detect Data Valid

0 = Not Valid

1 = Valid

MICD_STS

Mic Detect Status

0 = No mic/accessory present (impedance is >30 k

)

1 = Mic/accessory is present (impedance is <30 k

)

Only valid when ACCDET_MODE = 000.

R683 (0x02AB)

Mic_Detect_4

15:8 MICDET_

ADCVAL_

DIFF[7:0]

0x00

Mic Detect ADC Level (Difference)

Only valid when ACCDET_MODE = 111.

6:0

MICDET_

ADCVAL[6:0]

0x00

Mic Detect ADC Level

Only valid when ACCDET_MODE = 111.

Table 4-77. Microphone Detect Control (Cont.)

Address

Bit

Label

Default

Description

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