This Mini Base Board (A) for the Raspberry Pi Compute Module 4 is a compact CM4 breakout option offering a good set of features with a small footprint.
Two versions of this board are available - Lite (A) or Full (B). This is the Lite (A) version which does not include a Real-time Clock (RTC) or fan speed control.
With its M.2 slot, MicroSD card slot, dual-CSI ports and a host of other features, it's a great base for any CM4 project - and a more affordable option if you don't need the RTC/fan control functionality of the full version.
Note: Compute Module and M.2 SSD not included
Features
The CM4 Mini base board offers the following connectivity options and features:
- 40-pin Raspberry Pi GPIO header
- 1x RJ45 Gigabit Ethernet
- 2x USB 2.0 ports
- 1x Full-size HDMI port
- 1x M.2 slot (Supports NVME SSD or communication modules with PCI-E M.2 KEY-M interface)
- 1x MicroSD slot
- 2x CSI Camera ports
- 1x DSI Display port
- 1x USB 2.0 FFC Connector
- 1x HDMI FFC Connector
- 1x 4-pin fan header (no fan control)
- USB-C programming/power port


Specification
POE |
N/A |
USB |
USB 2.0 × 2 |
USB 2.0 × 2 (via FFC connector) |
GPIO |
Raspberry Pi 40PIN GPIO × 1 |
HEADER |
M.2 slot × 1 |
HDMI |
HDMI × 2 |
(1x via FFC connector) |
Supports 4K 30fps output |
DSI DISPLAY |
MIPI DSI × 1 |
(15pin 1.0mm FPC) |
CSI CAMERA |
MIPI CSI-2 × 2 |
(15pin 1.0mm FPC) |
POWER INPUT |
5V |
FAN |
5V |
N/A no fan control |
RTC |
N/A |
RJ45 ETHERNET |
Gigabit Ethernet |
CM4 SOCKET |
Suitable for all variants of Compute Module 4 |
SD CARD SLOT |
MicroSD card socket for Compute Module 4 Lite (without eMMC) variants |
DIMENSIONS (MM) |
85.0 × 56.0 |
What's Onboard

1) CM4 socket
- Suitable for all variants of Compute Module 4
2) Power input/Programming
- 5V/2.5A power supply, or used for eMMC burning
3) DISP
- MIPI DSI display port
4) Fan
- For connecting cooling fan, allows speed adjustment and measurement
5) Camera
- 2x MIPI CSI camera ports
6) HDMI0 connector
- HDMI0 port, supports 4K 30fps output
7) USB 2.0 ports
- 2x USB 2.0 ports, for connecting USB devices
8) Gigabit Ethernet connector
- Gigabit Ethernet RJ45 connector, with 10 / 100 / 1000M network support
9) M.2 indicator
- Indicating the operating status of M.2 interface
10) ACT indicator
- Indicating the operating status of Raspberry Pi
11) PWR indicator
- Indicating the status of Raspberry Pi power supply
12) BOOT selection
- ON: CM4 would be booted from USB-C interface
- OFF: CM4 would be booted from eMMC or Micro SD card
13) 40-pin GPIO header
14) Micro SD card slot
- For connecting a Micro SD card with pre-burnt image (Lite variant ONLY)
15) HDMI1 FFC connector
- HDMI1 port, supports 4K 30fps output
16) USB 2.0 FFC connector
- Can be connected through an adapter
17) FE1.1S
- USB HUB chip, expanding one USB port to 4x ports
18) M.2 slot
- Supports NVME SSD, or communication modules with PCI-E M.2 KEY-M interface
Resources
Package Contents
- 1x CM4 Mini Base Board (A)
- 1x SSD Mounting Screw
Compute Module and M.2 SSD not included