HDZero Halo Stack (HDZ58IA) (ICM + AM32)
by HDZero

The HDZero Halo Stack (HDZ58IA) is a premium, race-ready powertrain that combines the Halo H7 Flight Controller and the heavy-duty Halo 4-in-1 70A ESC into a single, solder-free ecosystem. Engineered by HDZero specifically for the extreme demands of digital FPV drone racing and agile freestyle, this 20x20mm mini-size stack eliminates analog clutter by removing the legacy OSD chip, clearing precious board space for high-end components. At the center of the flight controller is a lightning-fast 480MHz STM32H743 processor paired with a precision ICM42688 6-axis gyro, yielding ultra-low loop times and incredibly crisp flight tracking. Uniquely, the flight controller integrates a full 2.4GHz Gemini true diversity ExpressLRS receiver utilizing dual SX1280 RF chipsets and a temperature-compensated crystal oscillator (TCXO), ensuring an unbreakable control link even in high-heat, high-interference tournament environments.

Power handling is managed by the high-current Halo 4-in-1 ESC running modern, responsive AM32 firmware. Built with a robust split-board architecture that isolates control drivers from the power stage, it utilizes 24 heavy-duty MOSFETs arranged across an 8-layer PCB with massive 3oz copper per layer and an integrated pure copper bus bar to optimize burst throttle response and stop voltage sags during aggressive maneuvers. Rated for a continuous 70A per channel and up to 8S LiPo inputs, the ESC is fully protected with a clear factory conformal coating to seal out track moisture, grass juice, and dust. The entire stack features a plug-and-play layout where the ESC, VTX, and receiver interconnect via heavy-duty JST sockets, making field repairs completely tool-free, while a Betaflight-switchable 9V/3A BEC allows pilots to remotely power down their video transmitter during hot pit stops.

Technical Specifications

• Autopilot Core MCU: STM32H743VIT6 32-Bit Arm Cortex-M7 running at 480MHz

• Inertial Measurement Unit (Gyro): ICM42688 (High-efficiency 6-axis)

• Blackbox Data Storage: 16MB Onboard High-Rate Flash Memory

• Integrated RC Receiver: 2.4GHz Gemini True Diversity ExpressLRS (ESP32 + 2x SX1280 Chipset)

• Receiver Clock Hardware: Temperature-Compensated Crystal Oscillator (TCXO)

• Antenna Connector Interfaces: 2x IPEX1 / U.FL Ports

• Onboard BEC Output Networks: 9V/3A (Betaflight Switchable for VTX Control), 5V/4A (For high-draw LED arrays), 4.5V/0.5A (For GPS module pads)

• Expansion Hardware Buses: I2C Pads, UART2, UART7, UART8, ESC Telemetry (RX4), VTX MSP (TX5/RX5)

• Analog OSD Circuitry: None (Optimized purely for digital VTX telemetry canvas systems)

• ESC Core Microcontroller: AT32F421 (120MHz Processing Core)

• ESC Firmware Target Architecture: AM32 (Version 2.18 / Target: HDZ_ESC_1R0_F421)

• Input System Voltage Envelope: 3S to 8S LiPo / LiHV Battery Packs (DC 9V to 40V Input Limits)

• Continuous Current Load Rating: 70A per motor channel (Up to 30 seconds continuous full load)

• Peak Burst Current Capacity: 100A per channel (3-second extreme burst envelope)

• ESC Board Construction: 8-Layer PCB utilizing 3oz Copper per Layer with Rear-Mounted Copper Bus Bar

• Environmental Protection: Pre-applied clear factory conformal coating (Moisture, dust, and corrosion resistant)

• Supported Throttle Drive Signals: Dshot 150 / 300 / 600 / 1200 / 2400, MultiShot, OneShot

• Mounting Pattern Standard: 20 mm x 20 mm Pattern (M4 native holes, adapts to M3 via included silicone dampers)

• Total Stack Dry Weight: 13.4 grams

What's Included

• 1 x HDZero Halo H7 Flight Controller Module (ICM42688 Variant with Built-In Gemini ELRS RX)

• 1 x HDZero Halo 70A 3-8S 4-in-1 ESC Module (Pre-flashed with AM32 Firmware)

• 2 x 2.4GHz Omnidirectional Receiver Antennas (IPEX1 Connectors)

• 1 x SH1.0 8-Pin ESC-to-FC Interconnect Wiring Cable (30 mm length)

• 1 x Plug-and-Play Digital Video Transmitter Hookup Cable

• 1 x Heavy-Duty 35V 1000uF Low-ESR Electrolytic Capacitor

• 1 x Pre-Cut 70mm 12AWG Red and Black Silicone Power Leads with XT60 Connector

• 1 x Full Set of Anti-Vibration Silicone Shock Grommets and Nylon Mounting Washers