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STM32F405 Flight Controller with 85A AT32 4-in-1 ESC

FPV Electronics > Flight Controller

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The F405 Flight Controller is a multifunctional device designed for drones, integrating an F405 processor with an AT32 4-in-1 ESC (Electronic Speed Controller) for optimized performance and efficiency.
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STM32F405 Flight Controller + 85A AT32 4-in-1 ESC Combo Technical Brief

System Overview

Integrated flight control and power delivery system designed for high-performance 5-7" FPV drones, combining the reliability of STM32F405 with the power efficiency of AT32-based ESCs.

1. Flight Controller Specifications

ParameterSpecification
MCUSTM32F405RG (168MHz Cortex-M4)
IMUICM-42688-P (32kHz gyro)
Blackbox16MB Flash (4kHz logging)
Input Voltage3-8S (12.6-33.6V)
BEC Outputs5V@3A + 9V@2A
Connectivity5x UART, 1x I2C
CameraDual cameras, one-button switch via remote control
Board Size73*38*8mm
Board Weight20g

2. 85A 4-in-1 ESC Specifications

ParameterSpecification
MCUAT32F421K8U7 (120MHz Cortex-M4)
Continuous Current85A/channel (340A total)
Burst Current100A/channel (5sec)
ProtocolsDshot150/300/600/Multishot/Oneshot/PWM

3. Combined Features

Power System

  • • Integrated PDB: No separate power board needed

  • • Surge Protection: 40V transient voltage suppression

  • • Current Sensing: ±1% accuracy shunt resistors

4. Safety Features

Flight Controller Protections

Protection TypeSpecificationImplementation
Voltage Spike Protection30V continuous / 40V transientTVS diodes + π-filter
Gyro Vibration DampingReduces 10kHz+ vibrations by 90%Silicone soft-mount + 2-stage filter
Dual Power Inputs5V@3A (primary) + 5V@2A (backup)BEC output short circuit protection

ESC Protections

Protection TypeThresholdResponse TimeTrigger Condition
Hardware Overcurrent100A per channel≤5secondsThe MOS will heat up and break down if overtime
Software Overcurrent85A continuous≤30secondsSustained high current
Short CircuitHardware Isolation<100μsMotor winding fault
Over-temperature110°C (MOSFET)<1msMCU high temperature protection
Low Voltage Cutoff3.2V/cell<100msBattery depletion

5. Control System

F405 Flight Controller with 85A AT32 4-in-1 ESC 3.pngF405 Flight Controller with 85A AT32 4-in-1 ESC 4.png

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