UAV Control System Board PCBA

10-Layer Dual-Processor Platform with Isolated Power Domains — DO-254 / DO-160 / MIL-STD-704

Product Overview

The UAV Control System Board is a comprehensive platform-level PCBA that orchestrates all subsystems aboard an unmanned aerial vehicle. Assembled by Superb Automation to IPC-6012 Class 3 standards, this board integrates flight control, mission management, sensor fusion, payload coordination, and communication routing into a single cohesive unit. At its heart sits a heterogeneous computing architecture combining an STM32H7 real-time flight controller with an NVIDIA Jetson or Rockchip companion processor, connected via a high-speed UART and Ethernet bridge. This dual-processor design ensures that safety-critical flight stabilization remains isolated from non-critical mission computing tasks — a fundamental requirement for DO-254 airworthiness certification.

The 10-layer PCB features partitioned power domains with galvanic isolation between the flight-critical and payload sections, preventing a fault in one subsystem from propagating to others. All external interfaces — including CAN bus, RS-485, SBUS, and PWM outputs — are protected with TVS diodes and common-mode chokes to meet DO-160 electromagnetic environmental qualification. The board supports redundant GPS/GLONASS/Galileo inputs, dual telemetry radios, and a dedicated safety switch with independent hardware watchdog timer for kill-switch functionality. MIL-STD-704 compliant power conditioning accepts 12–48 V with isolated domains.

Key Specifications

DO-160 Environmental Qualification

The board is designed to meet DO-160G environmental qualification covering temperature/altitude (Section 4), humidity (Section 6), operational shock and crash safety (Section 7), vibration (Section 8), and power input (Section 16 per MIL-STD-704). Galvanic isolation between the flight-critical MCU domain and the payload SoC domain exceeds 1,500 VDC, ensuring that a catastrophic failure in the high-power companion processor cannot propagate to the safety-critical flight controller. The hardware watchdog timer operates on an independent clock source with a dedicated RC oscillator, eliminating common-mode failure risks.

PCBA Assembly Challenges

Assembling the dual-processor architecture requires precise thermal profiling to accommodate the differing reflow requirements of the STM32H7 BGA and the high-density Jetson SoM connector. The 10-layer board's thermal mass demands controlled ramp rates of 1–2 °C/s with a peak temperature of 235–245 °C. The galvanic isolation barriers require 100% hipot testing at 1,500 VDC between isolated domains post-assembly. TVS diode and common-mode choke placements are verified through automated optical inspection to ensure correct orientation for DO-160 surge protection compliance.

Test Strategy

ICT verifies all passive networks and power rail isolation resistance. Full functional testing exercises every interface simultaneously: all UARTs at maximum baud, CAN bus with error injection, Ethernet at 1 Gbps, and USB 3.0 loopback. The hardware watchdog and kill-switch circuits are tested under simulated fault conditions. Each board undergoes 48-hour burn-in with both processors running representative workloads while monitoring thermal performance, supply rail stability, and inter-domain isolation integrity.

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