Smart Module Series
SC206E_Series_Hardware_Design 63 / 115
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
⚫
The module offers three audio input channels.
⚫
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.
⚫
The earpiece interface uses differential output.
Pin Name
Pin No. I/O
Description
Comment
MIC_BIAS1
147
PO
Bias voltage 1 output for
microphone
The rated output current is 3 mA.
MIC1_P
4
AI
Microphone input for channel 1 (+)
-
MIC1_M
5
AI
Microphone input for channel 1 (-)
-
MIC2_P
6
AI
Microphone input for headset (+)
-
MIC3_P
148
AI
Microphone input for channel 3 (+)
-
MIC3_M
149
AI
Microphone input for channel 3 (-)
-
MIC_BIAS3
155
PO
Bias voltage 3 output for
microphone
The rated output current is 3 mA.
The output voltage is fixed to 1.8 V
and cannot be adjusted.
EAR_P
8
AO
Earpiece output (+)
-
EAR_M
9
AO
Earpiece output (-)
-
LINEOUT_P 10
AO
Audio line differential output (+)
The typical output voltage is 2 Vrms.
LINEOUT_M 11
AO
Audio line differential output (-)
-
HPH_R
136
AO
Headphone right channel output
-
HPH_GND
137
AO
Headphone reference ground
-
HPH_L
138
AO
Headphone left channel output
-
HS_DET
139
AI
Headset hot-plug detect
High level by default.