Smart Wi-Fi Module Series
SC20-WL Hardware Design
SC20-WL_Hardware_Design
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3.21. Audio Interfaces
SC20-WL module provides two analog input channels and three analog output channels. The following
table shows the pin definition.
Table 22: Pin Definition of Audio Interfaces
The module offers two audio input channels which are both single-ended channels.
The earpiece interface uses differential output.
The loudspeaker interface uses differential output as well. The output channel is available with a
Class-D amplifier whose output power is 879mW when VBAT is 4.2V and load is 8
Ω.
The headphone interface features stereo left and right channel output, and headphone insert
detection function is supported.
Pin Name
Pin No
I/O
Description
Comment
MIC1P
4
AI
Microphone positive input for channel 1
MIC_GND
5
MIC reference ground
MIC2P
6
AI
Microphone positive input for channel 2
EARP
8
AO
Earpiece positive output
EARN
9
AO
Earpiece negative output
SPKP
10
AO
Speaker positive output
SPKN
11
AO
Speaker negative output
HPH_R
136
AO
Headphone right channel output
HPH_GND
137
Headphone virtual ground
HPH_L
138
AO
Headphone left channel output
HS_DET
139
AI
Headset insertion detection
High level by default
