PX4 User Guide (v1.14)

# Holybro Pixhawk 6X

WARNING

PX4 does not manufacture this (or any) autopilot. Contact the manufacturer (opens new window) for hardware support or compliance issues.

Pixhawk 6X® is the latest update to the successful family of Pixhawk® flight controllers designed and made in collaboration with Holybro® and the PX4 team.

It is based on the Pixhawk​​® Autopilot FMUv6X Standard (opens new window), Autopilot Bus Standard (opens new window), and Connector Standard (opens new window).

Equipped with a high performance H7 Processor, modular design, triple redundancy, temperature-controlled IMU board, isolated sensor domains, delivering incredible performance, reliability, and flexibility.

TIP

This autopilot is supported by the PX4 maintenance and test teams.

# Introduction

Inside the Pixhawk®​ 6X, you can find an STMicroelectronics​® based STM32H753, paired with sensor technology from Bosch®​​, InvenSense®​,​ giving you flexibility and reliability for controlling any autonomous vehicle, suitable for both academic and commercial applications.

The Pixhawk® 6X's H7 microcontroller contain the Arm® Cortex®-M7 core running up to 480 MHz, has 2MB flash memory and 1MB RAM. The PX4 Autopilot takes advantage of the increased power and RAM. Thanks to the updated processing power, developers can be more productive and efficient with their development work, allowing for complex algorithms and models.

The FMUv6X open standard includes high-performance, low-noise IMUs on board, designed for better stabilization. Triple redundant IMU & double redundant barometer on separate buses. When the PX4 Autopilot detects a sensor failure, the system seamlessly switches to another to maintain flight control reliability.

An independent LDO powers every sensor set with independent power control. A vibration isolation System to filter out high-frequency vibration and reduce noise to ensure accurate readings, allowing vehicles to reach better overall flight performances.

External sensor bus (SPI5) has two chip select lines and data-ready signals for additional sensors and payload with SPI-interface, and with an integrated Microchip Ethernet PHY, high-speed communication with mission computers via ethernet is now possible.

The Pixhawk®​ 6X is perfect for developers at corporate research labs, startups, academics (research, professors, students), and commercial application.

# Key Design Points

  • High performance STM32H753 Processor
  • Modular flight controller: separated IMU, FMU, and Base system connected by a 100-pin & a 50-pin Pixhawk®​ Autopilot Bus connector.
  • Redundancy: 3x IMU sensors & 2x Barometer sensors on separate buses
  • Triple redundancy domains: Completely isolated sensor domains with separate buses and separate power control
  • Newly designed vibration isolation system to filter out high frequency vibration and reduce noise to ensure accurate readings
  • Ethernet interface for high-speed mission computer integration
  • IMUs are temperature-controlled by onboard heating resistors, allowing optimum working temperature of IMUs

# Processors & Sensors

  • FMU Processor: STM32H753
    • 32 Bit Arm® Cortex®-M7, 480MHz, 2MB flash memory, 1MB RAM
  • IO Processor: STM32F100
    • 32 Bit Arm® Cortex®-M3, 24MHz, 8KB SRAM
  • On-board sensors
    • Accel/Gyro: ICM-20649 or BMI088
    • Accel/Gyro: ICM-42688-P
    • Accel/Gyro: ICM-42670-P
    • Mag: BMM150
    • Barometer: 2x BMP388

# Electrical data

  • Voltage Ratings:
    • Max input voltage: 6V
    • USB Power Input: 4.75~5.25V
    • Servo Rail Input: 0~36V
  • Current Ratings:
    • TELEM1 output current limiter: 1.5A
    • All other port combined output current limiter: 1.5A

# Mechanical data

  • Dimensions
    • Flight Controller Module: 38.8 x 31.8 x 14.6mm
    • Standard Baseboard: 52.4 x 103.4 x 16.7mm
    • Mini Baseboard: 43.4 x 72.8 x 14.2 mm
  • Weight
    • Flight Controller Module: 23g
    • Standard Baseboard: 51g
    • Mini Baseboard: 26.5g

# Interfaces

  • 16- PWM servo outputs

  • R/C input for Spektrum / DSM

  • Dedicated R/C input for PPM and S.Bus input

  • Dedicated analog / PWM RSSI input and S.Bus output

  • 4 general purpose serial ports

    • 3 with full flow control
    • 1 with separate 1.5A current limit (Telem1)
    • 1 with I2C and additional GPIO line for external NFC reader

  • 2 GPS ports

    • 1 full GPS plus Safety Switch Port
    • 1 basic GPS port

  • 1 I2C port

  • 1 Ethernet port

    • Transformerless Applications
    • 100Mbps

  • 1 SPI bus

    • 2 chip select lines
    • 2 data-ready lines
    • 1 SPI SYNC line
    • 1 SPI reset line

  • 2 CAN Buses for CAN peripheral

    • CAN Bus has individual silent controls or ESC RX-MUX control

  • 2 Power input ports with SMBus

    • 1 AD & IO port
    • 2 additional analog input
    • 1 PWM/Capture input
    • 2 Dedicated debug and GPIO lines

  • Other Characteristics:

    • Operating & storage temperature: -40 ~ 85°c

# Where to Buy

Order from Holybro (opens new window).

# Assembly/Setup

The Pixhawk 6X Wiring Quick Start provides instructions on how to assemble required/important peripherals including GPS, Power Module etc.

# Connections

Sample Wiring Diagram Pixhawk 6X Wiring Overview

# Pinouts

Notes:

# Serial Port Mapping

UART Device Port
USART1 /dev/ttyS0 GPS
USART2 /dev/ttyS1 TELEM3
USART3 /dev/ttyS2 Debug Console
UART4 /dev/ttyS3 UART4 & I2C
UART5 /dev/ttyS4 TELEM2
USART6 /dev/ttyS5 PX4IO/RC
UART7 /dev/ttyS6 TELEM1
UART8 /dev/ttyS7 GPS2

# Dimensions

Pixhawk 6X Dimensions (opens new window)

# Voltage Ratings

Pixhawk 6X can be triple-redundant on the power supply if three power sources are supplied. The three power rails are: POWER1, POWER2 and USB. The POWER1 & POWER2 ports on the Pixhawk 6X uses the 6 circuit 2.00mm Pitch CLIK-Mate Wire-to-Board PCB Receptacle (opens new window).

Normal Operation Maximum Ratings

Under these conditions all power sources will be used in this order to power the system:

  1. POWER1 and POWER2 inputs (4.9V to 5.5V)
  2. USB input (4.75V to 5.25V)

Absolute Maximum Ratings

Under these conditions the system will not draw any power (will not be operational), but will remain intact.

  1. POWER1 and POWER2 inputs (operational range 4.1V to 5.7V, 0V to 10V undamaged)
  2. USB input (operational range 4.1V to 5.7V, 0V to 6V undamaged)
  3. Servo input: VDD_SERVO pin of FMU PWM OUT and I/O PWM OUT (0V to 42V undamaged)

Voltage monitoring

Digital I2C battery monitoring is enabled by default (see Quickstart > Power).

Note

Analog battery monitoring via an ADC is not supported on this particular board, but may be supported in variations of this flight controller with a different baseboard.

# Building Firmware

TIP

Most users will not need to build this firmware! It is pre-built and automatically installed by QGroundControl when appropriate hardware is connected.

To build PX4 for this target:

make px4_fmu-v6x_default

# Debug Port

The PX4 System Console and SWD interface run on the FMU Debug port.

The pinouts and connector comply with the Pixhawk Debug Full interface defined in the Pixhawk Connector Standard (opens new window) interface (JST SM10B connector).

Pin Signal Volt
1 (red) Vtref +3.3V
2 (blk) Console TX (OUT) +3.3V
3 (blk) Console RX (IN) +3.3V
4 (blk) SWDIO +3.3V
5 (blk) SWCLK +3.3V
6 (blk) SWO +3.3V
7 (blk) NFC GPIO +3.3V
8 (blk) PH11 +3.3V
9 (blk) nRST +3.3V
10 (blk) GND GND

For information about using this port see:

# Peripherals

# Supported Platforms / Airframes

Any multicopter / airplane / rover or boat that can be controlled with normal RC servos or Futaba S-Bus servos. The complete set of supported configurations can be seen in the Airframes Reference.

# Further info

← Holybro Pixhawk 6C (FMUv6C) →