Seco SBC-D23 User Manual page 40

3.3.16
The SD23 board is completed by a series of connectors with various interfaces managed by the microcontroller STM32F302VCT6. All signals available on these
connectors can be used as generic I/Os, but upon specific FW programming, they can be easily adapted to implement other interfaces, all of them described in the
following tables.
All signals, unless differently specified, are at 3P3V_RUN Voltage.
Dual 2-Wire UART connector
CN32
Pin Signal
1 +3P3V_OUT_EC
2 EC_UART1_TX
3 EC_UART1_RX
4 GND
5 +3P3V_OUT_EC
6 EC_UART5_TX
7 EC_UART5_RX
8 GND
Dual 4-Wire USART connector
Pin Signal Pin Signal
1 +3P3V_OUT_EC 2
3 EC_UART2_TX 4
5 EC_UART2_RX 6
7 EC_UART2_RTS/DE 8
9 EC_UART2_CTS 10
11 EC_UART2_CLK 12
13 GND 14
SBC-D23
SBC-D23 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: S.B. - Reviewed by P.Z. - Copyright © 2021 SECO S.p.A.
onnectors
It is possible to have two 2-Wire UARTs on an 8-pin 1.25mm pitch connector type Molex p/n 53398-
0871 or equivalent.
Mating connector: MOLEX 51021-0800 receptacle with MOLEX 50079-8000 female crimp terminals.
EC_UART1_TX: microcontroller UART port #1, Transmit signal. Connected to microcontroller
#4.
EC_UART5_RX: microcontroller UART p
Two others Synchronous UARTs can be made available on dedicated connector J2, which is an
J2
internal 14-pin dual row p.2.54 mm header (type MOLEX p/n 70246-1404 or equivalent).
Mating connector: MOLEX 22552141 Crimp Housing with MOLEX 70058 female crimp terminals series
+3P3V_OUT_EC
EC_UART2_TX: microcontroller USART port #2, Transmit signal. Connected to
EC_UART3_TX
#5.
EC_UART3_RX
EC_UART3_RTS/DE
#6.
EC_UART3_CTS
EC_UART2_RTS/DE: microcontroller USART port #2, Request To Send / Data Enable signal. Connected to
EC_UART3_CLK
GND
D, pin #3.
s port D, pin #4.
in
40