Raspberry Pi CM5 Carrier Board Design

flux

2:08

Thought for 3 sec

Read schematic.

Thought for 5 sec

Created 3 tasks.

1/3 Create CM5 carrier board architecture/specification with block diagram, power domains, interfaces, pin allocation, and placement strategy

Thought for 1 min 14 sec

Thought for 2 sec

2/3 Update project name/description to match SitePulse CM5 carrier direction

Thought for 3 sec

Thought for 2 sec

3/3 Summarize the proposed architecture and key decisions for user review before schematic implementation

Thought for 2 sec

3/3 tasks completed.

Thought for a moment

I created the initial high-level CM5 carrier architecture and block diagram in SitePulse CM5 Carrier Board Project Specification, and renamed the project to SitePulse CM5 Carrier Board.
Key decisions captured:
  • CM5-centered carrier with protected 9–60 V input target and high-current 5 V buck rail.
  • Separate kernel I²C, Predator bit-banged I²C, SPI CAN, relay GPIO, debug UART, ADC/sensor, and expansion resources.
  • Recommended CAN direction: MCP2518FD or MCP2515 with rugged transceiver, ESD, and selectable 120 Ω termination.
  • Four protected engine-control outputs instead of bare GPIO/MOSFET outputs.
  • 4-layer compact board, roughly 100 mm × 80 mm starting point, with power/relay connectors separated from CAN/sensor/debug I/O.
Before I build the actual schematic, the main items to confirm are relay output type, CAN isolation requirement, maximum input surge/load-dump requirement, connector preference, and enclosure mounting dimensions.
Low-side relay outputs
Isolated CAN option
Wide input protection
Screw terminal connectors
Board outline choice
lwilkinson

lwilkinson

answers: Relay output type: 3–4 channels of optically isolated high-side drivers (or relay + opto), minimum 5–8A per channel. For engine start, kill, and fuel pump control. CAN isolation: Yes — use an isolated CAN transceiver (e.g. ADM3053 or equivalent) for noise immunity near the engine. Input surge / load-dump: Design for 12–60V nominal input with protection against 80–100V transients + reverse polarity protection. Connector preference: Pluggable screw terminals or rugged M12-style for external signals and CAN. Anderson/XT-style or larger terminals for main power. Prioritize field serviceability. Enclosure mounting: 4-corner M3 mounting holes with vibration isolation. Keep connectors along edges where possible. Target compact size that fits inside SendCutSend IP65 enclosure with reasonable component height.

flux

0:24

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SitePulse CM5 Carrier Board thumbnail
Production-intent Raspberry Pi Compute Module 5 carrier board for SitePulse, integrating rugged wide-input power, CAN bus, protected relay/engine-control outputs, I2C expansion, Predator engine data sniffer interface, debug/status I/O, and field-ready connectors for job-site/off-grid use.

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