Open-Q™ 820 (APQ8096) / 820Pro (APQ8096SG) µSOM Development Kit User Guide Version 1.4
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Copyright Intrinsyc Technologies Corporation
3.8.11 Audio Inputs Expansion Header J50
Figure 14 J50 Audio Inputs Expansion Header
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:
Table 3.8-5 Audio Inputs Expansion Header J50 Pin out
Description
Signal
Pin NO
Description
Signal
Pin NO
Analog MIC1 positive
differential input
CDC_IN1_P
J50[1]
Analog MIC1
negative differential
input
CDC_IN1_N
J50[2]
Analog MIC5 positive
differential input
CDC_IN5_P
J50[3]
Analog MIC5
negative differential
input
CDC_IN5_N
J50[4]
MIC bias output
voltage 1
MIC_BIAS1
J50[5]
MIC bias output
voltage 3
MIC_BIAS3
J50[6]
Analog MIC6 positive
differential input
CDC_IN6_P
J50[7]
Analog MIC6
negative differential
input
CDC_IN6_N
J50[8]
MIC bias output
voltage 4
MIC_BIAS4
J50[9]
3.3V power supply
max 500mA
MB_VREG_3P3
J50[10]
GND
GND
J50[11]
GND
GND
J50[12]
Clock for digital MIC 1
and 2
CDC_DMIC_CL
K0
J50[13]
Clock for digital MIC
3 and 4
CDC_DMIC_CLK1 J50[14]
