Smart Module Series
SC200K_Series_Hardware_Design 66 / 105
⚫
The module offers three input channels, including two differential channels and one single-ended
channel.
⚫
The output voltage range of MIC_BIAS is programmable between 2.2 V and 3.0 V. The maximum
output current is 2 mA.
⚫
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 up to
0.8 W when load is 8 Ω.
⚫
The headphone interface features stereo left and right channel output, and supports headphone
insertion detection.
⚫
The 3 microphone inputs of the module are all integrated with a bias voltage inside the module and
support ECM microphone only. External bias voltage is not needed.
4.12.1. Reference Design for Microphone Interfaces
MIC1_M
NM
ECM MIC
C3
Module
MIC1_P
1
2
F1
D2
MIC_P
MIC_N
NM
C2
D1
F2
NM
R5
GND
C1
NM
Figure 26: Reference Circuit Design for Main Microphone
HPH_L
138
AO
Headphone left channel output
HS_DET
139
AI
Headset hot-plug detect
High level by default.
MIC_BIAS
147
PO
Bias voltage output for
microphone
MIC3_P
148
AI
Auxiliary microphone input (+)
MIC3_M
149
AI
Auxiliary microphone input (-)
