Asynchronous serial ports, Serial port signals, Reference schematic – IBASE SMARC Evaluation Kit User Manual
Page 44: Smarc evaluation kit, Uart1_tx o, Uart1_rx, Uart2_tx, Uart2_rx
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SMARC Evaluation Kit
4.2.12. Asynchronous Serial Ports
Serial Port Signals
Pin
Signal Name
I/O
Type
Power Rail
Description
P134
UART1_TX
O
CMOS
3.3V
Serial port 1 data out
P135
UART1_RX
I
CMOS
3.3V
Serial port 1 data input
P140
UART2_TX
O
CMOS
3.3V
Serial port 2 data out
P141
UART2_RX
I
CMOS
3.3V
Serial port 2 data input
P129
UART4_TX
O
CMOS
3.3V
Serial port 4 data out
P130
UART4_RX
I
CMOS
3.3V
Serial port 4 data input
P131
U4_RTS#
O
CMOS
3.3V
Request to Send handshake line for serial port 4
P132
U4_CTS#
I
CMOS
3.3V
Clear to Send handshake line for serial port 4
P136
UART5_TX
O
CMOS
3.3V
Serial port 5 data out
P137
UART5_RX
I
CMOS
3.3V
Serial port 5 data input
P138
U5_RTS#
O
CMOS
3.3V
Request to Send handshake line for serial port 5
P139
U5_CTS#
I
CMOS
3.3V
Clear to Send handshake line for serial port 5
Reference Schematic
C116
0.1UF/25V/4
C94
0.1UF/25V/4
U15
SP3232ECY -L
C1+
1
V+
2
C1-
3
C2+
4
C2-
5
V-
6
T2-OUT
7
R2-IN
8
R2-OUT
9
T2-IN
10
T1-IN
11
R1-OUT
12
R1-IN
13
T1-OUT
14
GND
15
VCC
16
C96
0.1UF/25V/4
C105
0.1UF/25V/4
+5V_VCC
C95
0.1UF/25V/4
RS232_RX2
RS232_TX2
CN15
HK_DF11-12S-PA66H
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
RS232_CTS#5
RS232_RX5
RS232_TX5
RS232_RTS#5
UART2_TX
13
+5V_VCC
RS232_TX1
RS232_RX1
UART2_RX
13
RS232_CTS#5
RS232_RX5
RS232_TX5
RS232_RTS#5
UART5_CTS#
13
UART5_RTS#
13
C97
0.1UF/25V/4
U16
SP3232ECY -L
C1+
1
V+
2
C1-
3
C2+
4
C2-
5
V-
6
T2-OUT
7
R2-IN
8
R2-OUT
9
T2-IN
10
T1-IN
11
R1-OUT
12
R1-IN
13
T1-OUT
14
GND
15
VCC
16
C113
0.1UF/25V/4
C119
0.1UF/25V/4
C117
0.1UF/25V/4
+5V_VCC
C118
0.1UF/25V/4
UART5_RX
13
UART5_TX
13
RS232_RX2
RS232_TX2
C121
0.1UF/25V/4
RS232_RX1
RS232_TX1
UART1_RX
13
UART1_TX
13