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CM5-Tiny

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Important Notes

  • The USB 3.0 Type-C port does not support reversible insertion; confirm orientation before plugging in.
  • CM5 core boards with eMMC only boot from eMMC; the onboard TF card slot is invalid for these versions.
  • The power on/off button is natively supported by Raspberry Pi OS and Ubuntu; not supported by default in OpenWrt.
  • PCIe expansion modules (WiFi7/SSD/TPU/AI) require a dedicated same-direction PCIe FPC cable.

Overview

The CM5_Tiny is a small expansion board designed specifically for the Raspberry Pi CM5 core board. It features standard interfaces including MicroHDMI/RTC/CAM/DISP/Fan/USB 3.0, with the HDMI port supporting 4K output, as well as a power button, a 1.25mm 4P USB port, and a 16Pin PCIe slot. It also has a dedicated USB 2.0 OTG port, which can be used to program the system to an eMMC/TF card and can be configured as a USB network adapter under OpenWrt. With OpenWrt, the CM5_Tiny can connect to a router via WiFi as a WLAN, and connect to a PC via USB OTG as a LAN.

With 4G LTE, the CM5_Tiny can connect to a PC via 4G under OpenWrt, using either WiFi or USB OTG on the CM5 core board itself as a LAN.

Features

For use with

Raspberry Pi Compute Module 5 (CM5), connector model DF40HC3.0

Key Features
  • USB 3.0 Type-C : Reversible insertion is not supported; one side is USB 3.0, the other side is USB 2.0. Please pay attention to the insertion orientation.
  • USB 2.0 OTG : Supports eMMC/TF card system programming and can be configured as a USB network card under OpenWrt.
  • USB 2.0 connector : 1.25mm-4Pin, can be used for 4G module expansion.
  • PCIe slot : 0.5mm-16Pin; can be used to expand peripherals such as WiFi/SSD/USB/2.5G network/AI/TPU.
  • RTC Real-Time Clock : 1.25mm - 2Pin
  • PWM Fan Interface : 1.0mm - 4Pin
  • Micro HDMI : Supports up to 4K video output
  • 0.5mm 22-pin CSI/DSI Combination FPC Port : For connecting a display or camera
  • GPIO Expansion Header : 0.5mm - 20Pin
  • TF Card Slot : For booting the system on CM5 core boards without eMMC only. Can be directly programmed via USB OTG port without removing the board and using a USB card reader.
  • BOOT Pin Header : 2.54mm - 2Pin, BOOT button. Press and hold while powering on to enter BOOT mode (Rev1.3 and Rev1.4). Used for programming the eMMC core board.
  • Power Supply : 5V 3A, USB-C powered, can be powered via USB-C OTG or USB 3.0-C
  • Power on/off button
  • 3 Status Indicators : Power Indicator, CM5 Power Indicator, Run Indicator
Technical Specification

Input Power:

  • 5V 3A USB-C input; power supported via both USB 3.0-C and USB 2.0 OTG ports


Connectivity:

  • 1× USB 3.0 Type-C (non-reversible; one side USB 3.0, reverse side USB 2.0)
  • 1× USB 2.0 Type-C OTG (for system flashing; works as virtual USB NIC under OpenWrt)
  • 1× USB 2.0 1.25mm-4Pin header (for 4G module expansion)
  • 1× PCIe 0.5mm-16Pin slot (for WiFi / NVMe SSD / AI / TPU / 2.5G network expansion)
  • 1× 0.5mm-22Pin CSI/DSI combo FPC port (for camera or display)
  • 1× 0.5mm-20Pin GPIO expansion header
  • 1× TF card slot (boot only for non-eMMC CM5 core boards)
  • 1× 1.25mm-2Pin RTC battery header
  • 1× 1.0mm-4Pin PWM fan header
  • 1× BOOT button, 1× Power on/off button
  • 3× Status LEDs (Power Indicator, CM5 Power Indicator, Run Indicator)

Video: 1× Micro HDMI, up to 4K resolution

Mechanical:

  • Board dimensions: 53.5mm × 55mm
  • Enclosure A dimensions: 58mm × 56mm × 16mm

PCB & Compliance

  • 4-layer PCB
  • UL94 V-0 flame retardant rating
  • RoHS compliant; UL certified

For optimal performance, please use the official Raspberry Pi 27W USB-C Power Supply or an alternative power supply capable of delivering 5.1V at 5A. An incompatible power supply with a lower output voltage may fail to power on the system.

User Manual

OS Flashing

System Guides

Optional General Reference

System Programming

1. Core Board Version Differentiation

  • - No eMMC Version: Supports TF card booting. The system can be programmed via a card reader or via the onboard OTG interface without removing the card.
  • - With eMMC Version: Only supports eMMC booting. The onboard TF card is invalid. The system must be programmed via USB OTG.

2. USB OTG Programming Steps

Press and hold the onboard BOOT button. Connect the OTG port to the computer using a USB-C cable and power on. Release the button after the computer recognizes the BCM2712 device to begin system programming. Power on again after programming is complete.

Packing List

  • CM5_Tiny expansion board × 1
  • CNC aluminum alloy casing A × 1
  • Fixing screws × 4

Note: Raspberry Pi CM5 core board, antenna, fan, and expansion modules are not included.

Matching Case

  • The CNC aluminum alloy casing is compact and exquisite, and provides heat dissipation for the CM5 core board.
  • A reserved antenna interface is provided: the WiFi CM5 core requires an external antenna (the metal casing will block the WiFi signal).
  • It is only compatible with single-board units; PCIe expansion modules cannot be stacked internally.

FAQ

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