CM5 Carrier (Integrated Gas / Audio / PIR / BME280) + 4× USB 2.x

Summary
Production-ready carrier board for Raspberry Pi Compute Module 5 (CM5), powered by USB-C 5 V. All sensors are integrated on the PCB (no modules): MQ-2-class gas front-end with heater driver, MAX9814-class mic preamp + electret, PIR motion, and BME280 (I²C). USB is USB 2.0 only: CM5 USB2 host → 4-port USB 2.0 High-Speed hub → 4× Type-A ports with per-port power switching & protection. Includes a user push-button and RGB status LED on GPIOs.

Must-Have Features
• Compute: CM5 on mating connectors; follow CM5 datasheet pinout, GPIO_VREF rules, rail budgets.
• USB: CM5 USB 2.0 host → 4-port HS hub (e.g., Microchip USB2514B or Terminus FE1.1S) → 4× USB Type-A; per-port VBUS switch (adj. ILIM), PPTC, VBUS TVS, ESD.
• Integrated sensors: MQ-2-class gas + MOSFET heater + ADC path; MAX9814-class audio + electret; BME280 (I²C) for T/P/H; PIR (digital preferred).
• User I/O: momentary push-button to GPIO22; PWR_Button (pin 92) to GND for soft power; RGB LED on GPIO5/6/13 (series resistors).
• Manufacturing: schematic+layout sources, Gerbers/NC/IPC-356, fab & stack-up, impedance targets, BOM with MPNs, centroid, assembly drawings, 3D STEP.
Reference Documents (must align)
• Raspberry Pi CM5 Datasheet (27 Nov 2024).
• Raspberry Pi CM5 IO Board Docs (27 Nov 2024).


Proposal Checklist
• EDA tool/version; 1–2 relevant USB2/PCIe + analog (audio/sensors) projects.
• Your PIR approach (digital vs. discrete) with part suggestions.
• USB per-port power path (switch, PPTC, TVS, ESD) and ILIM value you propose.
• Timeline per milestone; fixed-price bid; two rounds of review included.

Ref:
Raspberry Pi Compute Module 5 Datasheet, 27 Nov 2024: https://datasheets.raspberrypi.com/cm5/cm5-datasheet.pdf
Raspberry Pi Compute Module 5 IO Board documentation, 27 Nov 2024: https://datasheets.raspberrypi.com/cm5/cm5io-datasheet.pdf