MAD AM32 70A 3–12S 4-in-1 ESC – STM32L431 Processor, Telemetry, Dshot1200, for FPV Freestyle Long-range CineLifter Drones

MAD AM32 70A 3–12S 4in1 ESC

Overview

The MAD AM32 70A 4-in-1 ESC is a high-performance electronic speed controller designed for demanding industrial and FPV drone applications. Supporting 3–12S LiPo batteries and continuous 70A current per channel, it integrates the powerful STM32L431/432 Cortex-M4 processor and aviation-grade Infineon MOSFETs for exceptional efficiency, responsiveness, and durability. Ideal for large motors, long-range drones, and cine lifters.

Key Features

• Voltage Range: 3–12S LiPo (up to 50.4V)

• Continuous Current: 70A per channel (4-in-1)

• Processor: STM32L431/432 Cortex-M4, 48MHz

• Firmware: AM32 (supports online upgrades)

• MOSFETs: Infineon aviation-grade with excellent heat dissipation and overcurrent protection

• Capacitors: Imported TDK 35V/22µF high-voltage MLCC

• Telemetry: Real-time monitoring of current, voltage, RPM, and temperature

• Protocol Support: Dshot150/300/600/1200, Oneshot125/42, PWM, Multishot

• Size: 40×43×7mm

• Weight: 14.2g (excluding wires)

• Mounting Pattern: 30.5×30.5mm (standard)

Performance Comparison (vs. BLHeli32)

Note: BLHeli32 development has been discontinued. AM32 is recommended for Betaflight 4.5+ due to better bidirectional Dshot support.

Design Highlights

• Independent Current Sensing: Each ESC channel includes independent real-time current and voltage monitoring

• Online Firmware Upgrade: Supports convenient firmware updates via network

• Robust Build: Gold-plated 5.8P socket, easy FC ribbon cable connection

• High Input Voltage Tolerance: Supports input up to 100V for onboard BEC (MOS-dependent)

Wiring Diagram

• 4 motor outputs clearly labeled M1–M4

• XT60 battery input pads: BAT+ (red) and GND (black)

Firmware Resources

• Firmware and updates available at:
  https://github.com/bidump/BLHeli/tree/master/BLHeli_32%20ARM

Details

AM32 70A ESC, 3-12S 4-in-1. Features Infineon MOS, TDK MLCC, STM32L431 M4 Kernel. Supports real-time telemetry, online upgrades, customizable settings. Dimensions: 40x43x7mm, weight: 14.2g.