Smart LTE Module Series
SC600Y&SC600T Hardware Design
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Table 28: Pin Definition of Audio Interfaces
Pin Name
Pin No. I/O
Description
Comment
MIC1_P
44
AI
Microphone positive input for channel 1
MIC1_N
45
AI
Microphone negative input for channel 1
MIC_GND
168
Microphone reference ground
If unused, connect this
pin to the ground.
MIC2_P
46
AI
Microphone positive input for headset.
MIC3_P
169
AI
Microphone positive input for channel 2
MIC_BIAS
167
AO
Microphone bias voltage
EAR_P
53
AO
Earpiece positive output
EAR_N
52
AO
Earpiece negative output
SPK_P
55
AO
Speaker positive output
SPK_N
54
AO
Speaker negative output
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
High level by default.
⚫
The module offers three audio input channels, including one differential input pair and two
single-ended channels. The three sets of MICs are integrated with internal bias voltage.
⚫
The 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 loudspeaker interface uses differential output as well. The output channel is available with a
Class-D amplifier whose maximum ou
tput power is 1.5W when load is 8Ω.
⚫
The headphone interface features stereo left and right channel output, and headphone insertion
detection function is supported.
