ARM Cortex M7 Power -- What!?!?!
The SimpliFly H7 55A Stack brings high-end processing performance into an accessible 30.5Ă—30.5mm 4-in-1 layout. Combining an ultra-fast STM32H743 MCU with low-noise ICM-42688-P gyro tracking and a 55A continuous (65A burst) ESC platform, this flight stack is designed to handle modern high-frequency filtering requirements across Betaflight, INAV, and ArduPilot firmware targets.
Core Hardware Architecture
STM32H743 Flight Controller
Powered by an ARM Cortex-M7 core running at peak clock speeds, the FC features 16MB of onboard flash memory dedicated to high-rate Blackbox data logging. It includes an integrated BMP280 barometer for altitude hold, AT7456E analog OSD chip, 5 hardware UARTs, and full plug-and-play wiring harnesses for both analog VTX setups and HD digital air units (such as DJI O3/Avatar).
55A 4-in-1 ESC Power Stage
The matched 4-in-1 ESC delivers 55A continuous current per channel with a 65A peak burst rating over 3S–6S LiPo/Li-ion inputs. Supporting modern digital motor control protocols—including DShot300, DShot600, and Bidirectional DShot for RPM filtering—it ensures clean motor signal processing and telemetry pass-through directly back to the flight controller.
Technical Specifications
Comprehensive overview of key hardware specifications and build dimensions:
| Component / Parameter | Specification Detail |
|---|---|
| Main Processor (MCU) | STM32H743 (32-Bit ARM Cortex-M7) |
| Gyroscope / IMU | ICM-42688-P |
| Barometer | BMP280 |
| Onboard OSD | AT7456E Analog OSD Chip |
| Blackbox Memory | 16MB Onboard Data Flash |
| Continuous / Peak ESC Current | 55A Continuous per channel / 65A Burst |
| Input Voltage Range | 3S – 6S LiPo / Li-ion |
| ESC Digital Protocols | DShot300, DShot600, Bidirectional DShot |
| Serial Ports / UARTs | 5x Hardware UARTs + I2C Interface |
| Receiver Support | CRSF / ExpressLRS (ELRS), SBUS, IBUS |
| Mounting Pattern | 30.5 Ă— 30.5 mm (M4 holes with silicone grommets) |
| Stack Dimensions & Weight | 47.2 Ă— 40.5 Ă— 16.0 mm | 29.9g total |
| Firmware Compatibility | Betaflight, INAV, ArduPilot |
Integration & Build Considerations
Filtering & Dynamic Notch Setup
Thanks to the processing overhead of the STM32H743, running dual dynamic notch filters and 8kHz/8kHz PID loop rates in Betaflight causes virtually zero CPU load bottleneck. Combined with Bidirectional DShot RPM filtering, frame noise suppression is straightforward to dial in.
Power Management & Capacitance
When powering aggressive 6S freestyle or racing builds, voltage spikes during heavy regenerative braking can stress sensitive electronics. The stack ships with a 35V 1000µF Low ESR electrolytic capacitor that should be soldered directly across the main XT60 battery pads.