Smart LTE Module Series
SC650T Hardware Design
SC650T_Hardware_Design 75 / 131
MIC_BIAS3
167
AO
Microphone bias voltage
Dias voltage for
DMIC2
LINE_OUT_3
228
AO
Audio output
LINE_OUT_REF
227
AI
Audio output reference ground
LINE_OUT_4
226
AO
Audio output
AMIC1_P
218
AI
Analog microphone positive
input for channel 1
AMIC1_M
217
AI
Analog microphone negative
input for channel 1
AMIC2_P
216
AI
Analog microphone positive
input for headset
AMIC2_M
215
AI
Analog microphone negative
input for headset
EAR_P
53
AO
Earpiece positive output
EAR_N
52
AO
Earpiece positive output
PDM_CLK
55
AO
External audio power amplifier
clock interface
External connect to
WSA8810/WSA8815
PDM_DATA
54
AO
External audio power amplifier
data interface
External connect to
WSA8810/WSA8815
WSA_EN
230
DO
External audio power amplifier
enable signal
HPH_R
51
AO
Headphone right channel output
HPH_REF
50
AI
Headphone reference ground
HPH_L
49
AO
Headphone left channel output
HS_DET
48
AI
Headset insertion detection
Pulled up internally.
The module offers four audio input channels, including two digital input pair and two analog input
pair .
Three MIC_BIAS output. These output voltage range of MIC_BIAS is programmable between 1.6V
and 2.85V, and the maximum output current is 3mA.
The earpiece interface uses differential output.
The headphone interface features stereo left and right channel output, and headphone insertion
detection function is supported.