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