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Green rectangular circuit board with white GPIO header and multiple ports

WaveShare

WaveShare Mini Base Board for Raspberry Pi Compute Module 4 Lite/EMMC Version A

SKU CH-K7KM-2EB93

A compact carrier board with CM4 socket, 40-pin GPIO, HDMI, USB, Gigabit Ethernet, CSI/DSI, M.2 and microSD for evaluating or embedding Compute Module 4

  • Designed for Compute Module 4 evaluation and end-product integration
  • Standard CM4 socket with colour-coded 40PIN GPIO header for easy connection
  • Onboard CSI, DSI, HDMI, USB, Gigabit Ethernet, Micro SD and M.2 connectors
  • Version A omits RTC, fan controller and battery holder for lower cost
  • Includes mounting screws for secure installation

Mini Base Board for CM4 Lite/EMMC

This compact I/O board provides a standard CM4 socket and a colour-coded 40-pin GPIO header for the Raspberry Pi Compute Module 4 Lite or eMMC versions. It is intended for developers evaluating the module or for integration into finished products. The design omits RTC, fan controller and battery holder found on the B version to reduce cost.

Connectors and Power Limits

Onboard interfaces include CSI, DSI, fan, HDMI, USB, Gigabit Ethernet RJ45, micro SD slot and an M.2 slot. The fan header supports only 5 V fans; 12 V units must not be connected. A 5 V 2 A supply is required for normal operation. The Type-C port serves for power or USB device mode when flashing images.

Version A Constraints

This A variant lacks the real-time clock, fan-speed control and backup battery holder present on the alternative version. The DSI port is wired to DSI0 only, leaving DSI1 unconnected. Hot-plugging is restricted to USB and HDMI while powered. Mounting screws are supplied; incorrect screw lengths on the M.2 standoff can damage the Compute Module.

Highlights

  • Designed for Compute Module 4 evaluation and end-product integration
  • Standard CM4 socket with colour-coded 40PIN GPIO header for easy connection
  • Onboard CSI, DSI, HDMI, USB, Gigabit Ethernet, Micro SD and M.2 connectors
  • Version A omits RTC, fan controller and battery holder for lower cost
  • Includes mounting screws for secure installation

Specifications

No published specifications for this item yet.

Questions about this item

Which version of the Mini Base Board should I choose, A or B?

Version A omits the RTC, fan controller and battery holder found on version B, making it more cost effective while still providing the standard CM4 socket and colour coded 40PIN GPIO header.

What does the 40PIN GPIO header give me in a real build?

The colour coded 40PIN GPIO header matches the Raspberry Pi layout so you can attach HATs, sensors or custom circuits directly to the Compute Module 4.

What does the M.2 slot actually support on this board?

The M.2 connector is present for expansion; use the matching screws supplied to avoid damaging the CM4 core when fitting a module.

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