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85A ESC 4-in-1 AT32F421K8U7

FPV Electronics > ESC (Electronic Speed Controllers)

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High-performance 4-in-1 electronic speed controller utilizing the AT32F421K8U7 ARM Cortex-M4 MCU, designed for 5-8S FPV drones requiring ultra-fast response and robust power delivery.
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In Stock

 

85A 4-in-1 ESC (AT32F421K8U7) Technical Brief

Descriptions

High-performance 4-in-1 electronic speed controller utilizing the AT32F421K8U7 ARM Cortex-M4 MCU, designed for 2-8S FPV drones requiring ultra-fast response and robust power delivery. Delivers precise motor control with advanced telemetry capabilities in a compact 54×45mm form factor.

1. Main Specifications

ParameterSpecification
MCUAT32F421K8U7 (Cortex-M4 @ 120MHz)
Continuous Current85A/channel (4-in-1 total 340A)
Peak Current100A/channel (10 seconds)
Input Voltage2S-8S LiPo (12.6V-33.2V)
PWM Frequency8-48kHz (Programmable)
ProtocolsDShot150/300/600/Multishot/Oneshot/PWM
Dimensions54×45×8mm
Board Weight16g

2. Key Features

Power Stage

  • MOSFETs: 24× BSC010N04LS-5*6

  • Capacitance: 30× 22μF 35V ceramic capacitors + 1000μF electrolytic capacitor

  • Power Isolation: 4 independent LDO power supplies for stable operation

  • Current Sensing: High-precision shunt resistors with hardware filtering

Control System

  • MCU Performance: 120MHz clock speed with hardware FPU

  • Processing Speed: Single-cycle 32-bit multiplication

  • Update Rate: 32kHz signal processing

  • Algorithm: Hybrid FOC + PWM control

Protections

  • Overcurrent: Hardware comparator + software monitoring

  • Thermal Management: Throttle reduction @ 85°C

  • Voltage Spike: 40V transient protection

  • Short-Circuit: Motor phase-to-phase fault detection

3. Firmware Details

FeatureImplementation
Base FirmwareAM32_AORC_K_A_F421_2.16.hex
Startup Time<0.5s (power to ready)
Motor Compatibility700KV to 3000KV
TelemetryBi-directional DShot (RPM/voltage)
Tuning InterfaceESC-Configurator / Betaflight passthrough

4. Typical Applications

🚁 FPV Racing Drones:

  • • 5"-7" high-performance racers

  • • Low-latency digital HD systems

🎥 Cinematic Platforms:

  • • Heavy-lift camera drones

  • • Smooth-flow freestyle builds

⚡ High-Power Systems:

  • • 8S long-range cruisers

  • • Competition-grade freestyle quads

5. Accessories Package

  • • 1× 1000μF 35V electrolytic capacitor (10×20mm)

  • • 1× XT60-male 12AWG silicone cable (15cm)

  • • 1× SH1.0-8pins silicone cable (7cm, reversed)

  • • 5× M3×8mm shock-absorbing balls

6. Connection Diagram

85A4IN1 ESC1.png85A4IN1 ESC2.png

 

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