SBC-C61
SBC-C61 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.1 - Author: S.B. - Reviewed by N.P. - Copyright © 2021 SECO S.p.A.
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PDM_CLK: PDM Clock for both Left and Right Digital
microphone channels. VDD_3V3 electrical level
PDM_BIT_STREAM_RIGHT: PDM Data input for Audio Right
Channel
PDM_BIT_STREAM_LEFT: PDM Data input for Audio Left
Channel
SEL_RIGHT: Right Channel select signal. Tied to GND through
a 0
Ω
pull-down resistor.
SEL_LEFT: Left Channel select signal. Tied to VDD_3V3
through a 0
Ω
pull-up resistor
3.3.11
Serial Ports Connectors
Onboard, connector CN6 carries out signals related to UART #2 interface from i.MX8M Mini
processor. This interface can be used for the debugging of Cortex-A53 processors.
For this purpose, a dedicated 4-pin Connector, Type MOLEX p/n 53398-0471 or equivalent is
provided. Mating connector: MOLEX 51021-0400 receptacle with MOLEX 50079-8000 female
crimp terminals.
A53_DUART_TX: UART port #2 Transmit signal, VDD_3V3 electrical level
A53_DUART_RX: UART port #2 Receive signal, VDD_3V3 electrical level
The connector CN21, instead carries out signals related to UART #4 interface from i.MX8M Mini processor. This
interface can be used for the debugging of Cortex-M4 processor.
Connector type is the same as CN6.
M4_DUART_TX: UART port #4 Transmit signal, VDD_3V3 electrical level.
M4_DUART_RX: UART port #4 Receive signal, VDD_3V3 electrical level.
MIC Connector right channel CN42
Pin Signal
1
VDD_3V3
2
PDM_CLK
3
PDM_BIT_STREAM_RIGHT
4
SEL_RIGHT
5
GND
MIC Connector left channel CN53
Pin Signal
1
VDD_3V3
2
PDM_CLK
3
PDM_BIT_STREAM_LEFT
4
SEL_LEFT
5
GND
A53 Debug UART Connector CN6
Pin Signal
1
VDD_3V3
2
A53_DUART_TX
3
A53_DUART_RX
4
GND
M4 Debug UART Connector CN21
Pin Signal
1
VDD_3V3
2
M4_DUART_TX
3
M4_DUART_RX
4
GND
