Connections & Ports
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FC Module is internally connected to RPi CM4 through TELEM2
CM4 GPIO14 <-> FMU TXD TELEM2
CM4 GPIO15 <-> FMU RXD TELEM2
CM4 GPIO16 <-> FMU CTS TELEM2
CM4 GPIO17 <-> FMU RTS TELEM2
CM4 USB Device Port. Use for CM4 Power and image flash. Max input voltage
CM4 USB Host port. 1A Current output limit for each port.
CM4 Video Output
CM4 Slave
CM4 Host1&2
RPI
Data Connected
Power IN and Data
Data Not Connected
Power out only
EMMC
Data Not Connected
Power IN only
Data Connected
Power out and Data
Pin
Signal
Volt
1(red)
CM4_TRD0_P
+3.3V
2(pink)
CM4_TRD0_N
+3.3V
3(yellow)
CM4_TRD1_P
+3.3V
4(green)
CM4_TRD1_N
+3.3V
5(brown)
CM4_TRD2_P
+3.3V
6(blue)
CM4_TRD2_N
+3.3V
7(purple)
CM4_TRD3_P
+3.3V
8(black)
CM4_TRD3_N
+3.3V
Pin
Signal
Volt
1(red)
RXN
+3.3V
2(black)
RXP
+3.3V
3(black)
TXN
+3.3V
4(black)
TXP
+3.3V
Pin
Signal
Volt
1(red)
CM4_VDD_5V
+5V
2(black)
GND
GND
Pin
Signal
Volt
1
GND
GND
2
CM4_CAM1_D0_N
+3.3V
3
CM4_CAM1_D0_P
+3.3V
4
GND
GND
5
CM4_CAM1_D1_N
+3.3V
6
CM4_CAM1_D1_P
+3.3V
7
GND
GND
8
CM4_CAM1_CLK_N
+3.3V
9
CM4_CAM1_CLK_P
+3.3V
10
GND
GND
11
CM4_CAM1_D2_N
+3.3V
12
CM4_CAM1_D2_P
+3.3V
13
GND
GND
14
CM4_CAM1_D3_N
+3.3V
15
CM4_CAM1_D3_P
+3.3V
16
GND
GND
17
CM4_CAM1_GPIO
+3.3V
18
No Connected
--
19
GND
GND
20
CM4_I2C0_SCL
+3.3V
21
CM4_I2C0_SDA
+3.3V
22
CM4_VDD_3V3
+3.3V
Pin
Signal
Volt
1(red)
VDD5V_BRICK1/2
+5V
2(black)
VDD5V_BRICK1/2
+5V
3(black)
SCL1/2
+3.3V
4(black)
SDA1/2
+3.3V
5(black)
GND
GND
6(black)
GND
GND
Pin
Signal
Volt
1(red)
VCC
+5V
2(black)
TX7/5/2 (out)
+3.3V
3(black)
RX7/5/2 (in)
+3.3V
4(black)
CTS7/5/2 (in)
+3.3V
5(black)
RTS7/5/2 (out)
+3.3V
6(black)
GND
GND
Pin
Signal
Volt
1(red)
VCC
+5V
2 black)
TX1(out)
+3.3V
3(black)
RX1(in)
+3.3V
4(black)
SCL1
+3.3V
5(black)
SDA1
+3.3V
6(black)
SAFETY_SWITCH
+3.3V
7(black)
SAFETY_SWITCH_LED
+3.3V
8(black)
VDD_3V3
+3.3V
9(black)
BUZZER-
0~5V
10(black)
GND
GND
Pin
Signal
Volt
1(red)
VCC
+5V
2 black)
TX8(out)
+3.3V
3(black)
RX8(in)
+3.3V
4(black)
SCL2
+3.3V
5(black)
SDA2
+3.3V
6(black)
GND
GND
Pin
Signal
Volt
1(red)
VCC
+5V
2(black)
CANH1/2
+3.3V
3(black)
CANL1/2
+3.3V
4(black)
GND
GND
Pin
Signal
Volt
1(red)
VCC
+5V
2(black)
TX4(out)
+3.3V
3(black)
RX4(in)
+3.3V
4(black)
SCL3
+3.3V
5(black)
SDA3
+3.3V
6(black)
NFC_GPIO
+3.3V
7(black)
GND
GND
Pin
Signal
Volt
1(red)
VCC
+5V
2 (black)
SPI6_SCK
+3.3V
3(black)
SPI6_MISO
+3.3V
4(black)
SPI6_MOSI
+3.3V
5(black)
SPI6_CS1
+3.3V
6(black)
SPI6_CS2
+3.3V
7(black)
SPIX_SYNC
+3.3V
8(black)
SPI6_DRDY1
+3.3V
9(black)
SPI6_DRDY2
+3.3V
10(black)
SPI6_nRESET
+3.3V
11(black)
GND
GND
Pin
Signal
Volt
1(red)
VBUS
+5V
2(black)
DM
+3.3V
3(black)
DP
+3.3V
4(black)
GND
GND
Pin
Signal
Volt
1(red)
VCC
+5V
2(black)
SCL3
+3.3V
3(black)
SDA3
+3.3V
4(black)
GND
GND
Pin
Signal
Volt
1(red)
RXN
+3.3V
2(black)
RXP
+3.3V
3(black)
TXN
+3.3V
4(black)
TXP
+3.3V
Pin
Signal
Volt
1(red)
VCC
+5V
2(black)
FMU_CAP1
+3.3V
3(black)
FMU_BOOTLOADER
+3.3V
4(black)
FMU_RST_REQ
+3.3V
5(black)
NARMED
+3.3V
6(black)
ADC1_3V3
+3.3V
7(black)
ADC1_6V6
+6.6V
8(black)
GND
GND
Pin
Signal
Volt
1(yellow)
VDD_3V3_SPEKTRUM
+3.3V
2(black)
GND
GND
3(gray)
DSM/SPEKTRUM IN
+3.3V
Pin
Signal
Volt
S
SBUS/PPM in
+3.3V
+
VDD_5V _RC
+5V
-
GND
GND
Pin
Signal
Volt
1(red)
IO_VDD_3V3
+3.3V
2 black)
IO_USART1_TX
+3.3V
3(black)
NC
--
4(black)
IO_SWD_IO
+3.3V
5(black)
IO_SWD_CK
+3.3V
6(black)
IO_SWO
+3.3V
7(black)
IO_SPARE_GPIO1
+3.3V
8(black)
IO_SPARE_GPIO2
+3.3V
9(black)
IO_nRST
+3.3V
10(black)
GND
GND
Pin
Signal
Volt
1(red)
FMU_VDD_3V3
+3.3V
2 black)
FMU_USART3_TX
+3.3V
3(black)
FMU_USART3_RX
+3.3V
4(black)
FMU_SWD_IO
+3.3V
5(black)
FMU_SWD_CK
+3.3V
6(black)
SPI6_SCK_EXTERNAL1
+3.3V
7(black)
NFC_GPIO
+3.3V
8(black)
PH11
+3.3V
9(black)
FMU_nRST
+3.3V
10(black)
GND
GND
Pin
Signal
Volt
S
SBUS_OUT/RSSI_IN
+3.3V
+
VDD_SERVO
0~36V
-
GND
GND
Pin
Signal
Volt
S
FMU_CH1~8
+3.3V
+
VDD_SERVO
0~36V
-
GND
GND
Pin
Signal
Volt
S
IO_CH1~8
+3.3V
+
VDD_SERVO
0~36V
-
GND
GND
