Audio Interfaces - Quectel SC206E Series Hardware Design

3.22. Audio Interfaces

The module provides three analog input channels and three analog output channels. The following table
shows the pin definition.
Table 26: Pin Definition of Audio Interfaces
Pin Name Pin No.
MIC_BIAS1 147
MIC1_P 4
MIC1_M 5
MIC2_P 6
MIC3_P 148
MIC3_M 149
MIC_BIAS3 155
EAR_P 8
EAR_M 9
LINEOUT_P 10
LINEOUT_M 11
HPH_R 136
HPH_GND 137
HPH_L 138
HS_DET 139
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The module offers three audio input channels.
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The output voltage range of MIC_BIAS1 is programmable between 1.6 V and 2.85 V, and the
maximum output current is 3 mA. MIC_BIAS3 supports 1.8 V pull-up output only and is not
programmable.
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The earpiece interface uses differential output.
SC206E_Series_Hardware_Design
I/O Description
Bias voltage 1 output for
PO
microphone
AI Microphone input for channel 1 (+)
AI Microphone input for channel 1 (-)
AI Microphone input for headset (+)
AI Microphone input for channel 3 (+)
AI Microphone input for channel 3 (-)
Bias voltage 3 output for
PO
microphone
AO Earpiece output (+)
AO Earpiece output (-)
AO Audio line differential output (+)
AO Audio line differential output (-)
AO Headphone right channel output
AO Headphone reference ground
AO Headphone left channel output
AI Headset hot-plug detect
Smart Module Series
Comment
The rated output current is 3 mA.
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The rated output current is 3 mA.
The output voltage is fixed to 1.8 V
and cannot be adjusted.
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The typical output voltage is 2 Vrms.
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High level by default.
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