Smart Module Series
SC606T Series Hardware Design
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Table 24: Pin Definition of Audio Interfaces
Pin Name
Pin No.
I/O
Description
Comment
MIC1_P
44
AI
Microphone input for channel 1 (+)
MIC1_N
45
AI
Microphone input for channel 1 (-)
MIC_GND
168
Microphone reference ground
If unused, connect this
pin to the ground.
MIC2_P
46
AI
Microphone input for headset (+)
MIC3_P
169
AI
Microphone input for channel 2 (+)
MIC_BIAS
167
PO
Bias voltage output for microphone
EAR_P
53
AO
Earpiece output (+)
EAR_N
52
AO
Earpiece output (-)
SPK_P
55
AO
Speaker output (+)
SPK_N
54
AO
Speaker output (-)
HPH_R
51
AO
Headphone right channel output
HPH_REF
50
AI
Headphone reference ground
It should be connected
to the main GND.
HPH_L
49
AO
Headphone left channel output
HS_DET
48
AI
Headset hot-plug detect
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 can be set at between 1.6 V and 2.85 V, and the maximum
output current is 3 mA.
⚫
The earpiece interface is a differential output pair.
⚫
The loudspeaker interface is a differential output pair as well. This output channel is available with a
Class-D amplifier whose maximum output power is 1.5 W when the load is 8
Ω.
⚫
The headphone interface features stereo audio output via left and right channels, as well as the
function of headphone insertion detect.