Acci FC Flight Controller F4 ELITE

A high-performance drone flight controller in a 30x30 mounting form factor, designed for both AT32F435 and STM32F405 microcontrollers. Both are fully supported on the same PCB. The recommendation is AT32F435.

✳️ Key Features

MCU Options:
- AT32F435
- STM32F405
Gyroscope
- ICM-42688-P
- Powered by a dedicated 3.3V rail to suppress electrical noise and enhance signal stability
Barometer
- DPS368 for accurate altitude measurement and waterproof.
Blackbox Flash Memory
- W25Q128JVSIQTR
- Supports up to 128MB of onboard logging
UARTs
- 6 hardware UART ports for peripherals
USB Interface
- USB Type-C for modern connectivity and ease of use
Power System
- 5V and 10V power rails using MP9943GQ-Z strong high-efficiency DC-DC converters
- 3.3V power rails powered by TPS7A2033 low-noise LDO regulators
Video & Peripherals
- Dedicated 10V pad for DJI/Walksnail/HDZero video systems
Other Components
- Buzzer driver
- Reliable power filtering and decoupling

⚙️ Betaflight Firmware

A Betaflight target is available already on the Betaflight Configurator. Simply open the flasher option, select "ACCIF435ELITE" target and flash!

UART3 and UART2 notice

Be aware that UART 3 and UART2 connected peripherals may disable DFU mode. This is really common on many of the FCs but manufactures usually does not make it public.

UART3 with RX or GPS are prone to hijiack DFU mode, if that happens to you, desolder it temporarily.
UART2 should be less than an issue as is mostly reserved for ESC and no devices should be connected.

This will only affect when enabling DFU mode and some peripherals are on those ports, not all peripherals will be an issue. Use first any of the other 4 UARTS available if possible.

Status LEDs pin assigment

Status LEDs are using pin PC14 and PC15. Betaflight recommends avoid using them as the provided current by those pin is limited. AT32F435 seems to provide enough for the purpose but please if you consider using this desing be aware of this.