Edge General-Purpose Computing Controller

Project Overview

An industrial automation company needed a flexible edge computing controller PCB that could serve as a universal platform across multiple factory automation applications. The controller had to support modular expansion while maintaining real-time processing performance and robust physical security for deployment in sensitive manufacturing environments.

Challenge

• Modular architecture: The PCB needed to support multiple plug-in daughter cards for different I/O configurations (analog, digital, communication) while maintaining signal integrity across all module combinations.
• Security requirements: Deployment in critical infrastructure demanded hardware-level security features including secure boot, tamper detection, and encrypted communication interfaces.
• High-speed routing: DDR4 memory interfaces and Gigabit Ethernet required precise impedance matching and length-matched differential pairs on a dense 10-layer stackup.
• Industrial reliability: 24/7 continuous operation in factory environments with vibration, dust, and temperature extremes from 0C to +70C.

Solution

NimblePCB delivered a comprehensive PCB and PCBA solution that balanced modularity with industrial-grade reliability:

• Optimized stackup: 10-layer controlled-impedance stackup with dedicated power/ground plane pairs for each major functional block. Impedance-matched differential pairs for DDR4 and Ethernet with length matching within 5 mil.
• Modular connector system: High-reliability board-to-board connectors with guided mating for all expansion modules. Each module slot included independent power isolation and ESD protection.
• Security integration: Dedicated secure element footprint with shielded routing. Tamper-detect mesh on inner layers covering critical security IC area.
• Thermal design: Embedded copper coin under the main processor with thermal vias array, maintaining junction temperature below 85C at full load without external heatsink.

PCB Specifications

Results

• All module combinations passed signal integrity validation at full data rates
• Achieved UL/CE certification on first submission
• Modular platform reduced customer’s time-to-market for new I/O variants by 60%
• Scaled to 2,000 units/month production within first quarter