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Introduction

FMUv4-PRO takes input from all of the Pixhawk stakeholders; end users, developers, researchers and manufacturing partners. Goals for this iteration of the platform are:

  • An integrated, single-board flight controller for space constrained applications
  • A modular multi-board flight controller for professional applications
  • Sufficient I/O for most applications without expansion.
  • Improved ease-of-use.
  • Improved sensor performance
  • Improved microcontroller resources (384 KB RAM, 2 MB flash).
  • Increased reliability and reduced integration complexity.
  • Reduced BoM and manufacturing costs.

Key design points:

  • All-in-one design with integrated FMU and optional IO and lots of I/O ports.
  • Improved manufacturability, designed for simpler mounting and case design.
  • Separate power supplies for FMU and IO (see power architecture section).
  • Onboard battery backup for FMU and IO SRAM / RTC.
  • Integration with two standard power bricks.

Technology upgrades:

  • Microcontroller upgrade to STM32F469; flash increases from 1MiB to 2MiB, RAM increases from 256KiB to 384KiB, more peripheral ports.
  • ICM-20602, MPU9K integrated gyro / accelerometer / magnetometers.
  • LIS3MDL compass (HMC5983 is now obsolete).
  • Sensors connected via two SPI buses (one high rate and one low-noise bus)
  • Two I2C buses
  • Two CAN buses
  • Voltage / battery readings from two power modules
  • FrSky Inverter
  • JST GH user-friendly connectors

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