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Connections & Ports

This baseboard is compatible with both Pixhawk 5X & 6X, and any flight controller that follow the Pixhawk Bus Standard.

This baseboard is compatible with both Pixhawk 5X & 6X, and any flight controller that follow the Pixhawk Bus Standard.

Connection Between RPi CM4 & Flight Controller:

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 Slave USB-C port:

CM4 USB Device Port. Use for CM4 Power and image flash. Max input voltage: 5V

CM4 Host1 & Host2 USB-C Port:

CM4 USB Host port. 1A Current output limit for each port.

Micro HDMI:

CM4 Video Output

Dip Switch

Refer to this diagram for location of pin1. All connectors are JST GH 1.25 mm Pitch unless noted otherwise.

CM4 ETH port

FC ETH Port

FAN port

CAMERA Port (Use for CSI Camera IN)

Power1 (Main) & Power2 Port (Backup) (2.00mm Pitch CLIK-Mate)

Telem1, Telem2, Telem3 ports

GPS 1 Port

GPS 2 Port

CAN1, CAN2 ports

Uart4 & I2C port

SPI Port

USB Port

I2C Port

ETH Port

AD&IO Port

DSM RC Port (JST-ZH 1.5mm Pitch)

RC IN Port

IO Debug Port (JST-SH 1mm Pitch)

FMU Debug Port (JST-SH 1mm Pitch)

RSSI Port

FMU PWM OUT (AUX)

I/O PWM OUT (MAIN)

+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

+3.3V

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

+3.3V

5(black)

GND

GND

6(black)

GND

GND

+3.3V

5(black)

RTS7/5/2 (out)

+3.3V

6(black)

GND

GND

+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

+3.3V

5(black)

SDA2

+3.3V

6(black)

GND

GND

GND

+3.3V

5(black)

SDA3

+3.3V

6(black)

NFC_GPIO

+3.3V

7(black)

GND

GND

+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

GND

GND

+3.3V

+3.3V

5(black)

NARMED

+3.3V

6(black)

ADC1_3V3

+3.3V

7(black)

ADC1_6V6

+6.6V

8(black)

GND

GND

+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

+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

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)

Pin

Signal

Volt

1(red)

RXN

+3.3V

2(black)

RXP

+3.3V

3(black)

TXN

+3.3V

4(black)

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

Pin

Signal

Volt

1(red)

VDD5V_BRICK1/2

+5V

2(black)

VDD5V_BRICK1/2

+5V

3(black)

SCL1/2

+3.3V

4(black)

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)

Pin

Signal

Volt

1(red)

VCC

+5V

2 black)

TX1(out)

+3.3V

3(black)

RX1(in)

+3.3V

4(black)

Pin

Signal

Volt

1(red)

VCC

+5V

2 black)

TX8(out)

+3.3V

3(black)

RX8(in)

+3.3V

4(black)

Pin

Signal

Volt

1(red)

VCC

+5V

2(black)

CANH1/2

+3.3V

3(black)

CANL1/2

+3.3V

4(black)

Pin

Signal

Volt

1(red)

VCC

+5V

2(black)

TX4(out)

+3.3V

3(black)

RX4(in)

+3.3V

4(black)

Pin

Signal

Volt

1(red)

VCC

+5V

2 (black)

SPI6_SCK

+3.3V

3(black)

SPI6_MISO

+3.3V

4(black)

Pin

Signal

Volt

1(red)

VBUS

+5V

2(black)

DM

+3.3V

3(black)

DP

+3.3V

4(black)

Pin

Signal

Volt

1(red)

VCC

+5V

2(black)

SCL3

+3.3V

3(black)

SDA3

+3.3V

4(black)

Pin

Signal

Volt

1(red)

RXN

+3.3V

2(black)

RXP

+3.3V

3(black)

TXN

+3.3V

4(black)

Pin

Signal

Volt

1(red)

VCC

+5V

2(black)

FMU_CAP1

+3.3V

3(black)

FMU_BOOTLOADER

+3.3V

4(black)

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)

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)

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

FC & CM4 connected via ethernet using cabled provided.

CM4_TRD1_N

TXP

GND

SDA1/2

CTS7/5/2 (in)

SCL1

SCL2

GND

SCL3

SPI6_MOSI

GND

GND

TXP

FMU_RST_REQ

IO_SWD_IO

FMU_SWD_IO