Intrinsyc LANTRONIX Open-Q 820 User Manual page 36

3.9.11 Audio Inputs Expansion Header J50
This header expansion provides the following audio inputs:
1. 3 digital mic inputs (each can support 2 digital microphones)
2. 3 analog mics
3. Voltage rails to support analog and digital mics
For details on how to connect analog or digital microphones to system, refer to sections 4.1.9 on Open-Q 820
/ 820Pro µSOM Development Kit µSOM Technical Note19 (document R-3).
The table below outlines the pin out information of the audio inputs expansion header J50:
Description
Analog MIC1 positive
differential input
Analog MIC5 positive
differential input
MIC bias output
voltage 1
Analog MIC6 positive
differential input
MIC bias output
voltage 4
Open-Q™ 820 / 820Pro µSOM Dev Kit User Guide
Figure 14 J50 Audio Inputs Expansion Header
Table 3.8-5 Audio Inputs Expansion Header J50 Pin out
Signal Pin NO
CDC_IN1_P J50[1]
CDC_IN5_P J50[3]
MIC_BIAS1 J50[5]
CDC_IN6_P J50[7]
MIC_BIAS4 J50[9]
Open-Q 820 µSOM Development Kit
Description
Analog MIC1 CDC_IN1_N
negative differential
input
Analog MIC5 CDC_IN5_N
negative differential
input
MIC bias output MIC_BIAS3
voltage 3
Analog MIC6 CDC_IN6_N
negative differential
input
3.3V power supply MB_VREG_3P3
max 500mA
Signal Pin NO
J50[2]
J50[4]
J50[6]
J50[8]
J50[10]
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