Quectel SC690A Series Hardware Design page 72

DMIC1_CLK 46
DMIC2_DATA 168
DMIC2_CLK 169
MIC_BIAS1 44
MIC_BIAS2 233
MIC_BIAS3 167
MIC1_P 218
MIC1_M 217
MIC2_P 216
MIC2_M 215
MIC3_P 214
MIC3_M 213
EAR_P 53
EAR_M 52
LINE_OUT_P 181
LINE_OUT_M 180
HPH_R 51
HPH_L 49
HPH_GND 50
HS_DET 48
⚫
The module offers five audio input/output channels, including two digital channels and three analog
channels.
⚫
The output voltage range of MIC_BIAS is programmable between 1.0 V and 2.85 V, and the
maximum output current is 3 mA.
⚫
The earpiece interface uses differential output.
⚫
LINE_OUT for audio external speaker amplifier.
⚫
The headset interface features stereo left and right channel output, and headset insert detection
function is supported.
SC690A_Series_Hardware_Design
DO Digital microphone 1 clock
DIO Digital microphone 2 data
DO Digital microphone 2 clock
AO Microphone bias output voltage 1
AO Microphone bias output voltage 2
AO Microphone bias output voltage 3
AI Microphone input for channel 1 (+)
AI Microphone input for channel 1 (-)
AI Microphone input for channel 2 (+)
AI Microphone input for channel 2 (-)
AI Microphone input for channel 3 (+)
AI Microphone input for channel 3 (-)
AO Earpiece output (+)
AO Earpiece output (-)
AO Aux amplifier output (+)
AO Aux amplifier output (-)
AO Headphone right channel output
AO Headphone left channel output
AI Headphone reference ground
AI Headset hot-plug detect
Smart Module Series
Used for ECM
microphone by default.
MIC1_P require pulled up
to MIC_BIAS1.
Used for headset
microphone by default.
MIC2_P require pulled up
to MIC_BIAS2.
Used for MEMS
microphone by default.
MIC3_P require pulled up
to MIC_BIAS3.
Pulled up internally.
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