Seco SBC-C20 User Manual page 34

Dual Analog Mic in Connector
Dual Analog Mic In CN33
Pin Signal
1 MIC2_L
2 MIC2_R
3 MIC1_L
4 MIC1_R
Optional 10W Amplified Speaker Out Connector
10W Amplified Speaker Out
CN35
Pin Signal
1 AMP_SPEAKER_LP
2 GND
3 GND
4 AMP_SPEAKER_RP
Digital Mic In connector
Digital Mic IN connector CN48
Pin Signal
1 +3P3V_AUDIO
2 MIC_DAT1
3 MIC_CLK
4 MIC_DIR
5 GND
SBC-C20
SBC-C20 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R. - Reviewed by C.M. -Copyright © 2020 SECO S.p.A.
It is also possible to connect up to two additional analog microphones by using dedicated connector CN33,
which is a 4-pin p1.27mm connector type Molex p/n 53398-0471 or equivalent, with pinout shown in the
table on the left.
Mating connector: MOLEX 51021-0400 receptacle with MOLEX 50079-8000 female crimp terminals.
MIC2_L: Microphone #2 left channel analog input for audio codec
MIC2_R: Microphone #2 right channel analog input for audio codec
MIC1_L: Microphone #1 left channel analog input for audio codec
MIC1_R: Microphone #2 right channel analog input for audio codec
An additional connector carries out two additional audio signals, managed by the same Codec and amplified by
two Audio Amplifiers model MP7720DS (each one offering output power 10W on an 8Ohm load / 20W on a
4Ohm load). This connector is type MOLEX Micro-Fit 3.0 p/n 43045-0400 or equivalent.
AMP_SPEAKER_LP: amplified line output Left channel
AMP_SPEAKER_RP: amplified line output Right channel
On SBC-C20 board, the TLV320AIC3204IRHBR Audio Codec offer also the possibility of connecting
external digital microphones, by using the connector CN48, which is 5-pin p1.27mm connector type
Molex p/n 53398-0571 or equivalent, with pinout shown in the table on the left.
Mating connector: MOLEX 51021-0500 receptacle with 50079-8000 female crimp terminals.
Type MOLEX p/n 53398-0571 or equivalent Audio input signals to right and left ADC are received.
MIC_DAT1: digital microphone data bidirectional, electrical level +3P3V_AUDIO with 10K pull-up resistor.
MIC_CLK: digital microphone clock output, electrical level +3P3V_AUDIO with 10K pull-up resistor.
MIC_DIR: direct connection to GND through a 10K pull-down resistor.
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