Mini Base Board (C) Designed for Raspberry Pi Compute Module 4

SKU: 23228
Part Number: CM4-IO-BASE-C
Brand: Waveshare


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Mini Base Board (C) Designed for Raspberry Pi Compute Module 4
Mini Base Board For Compute Module 4 (Advanced Version)

suitable for evaluating the Raspberry Pi CM4 or being integrated into end products

Dedicated 40PIN LCD Connector, Powerful Functions In Mini Body

Dedicated 40PIN LCD Connector

One connection For Display And Touch, Support 70H-1024600-IPS-A Series Display
Easier and Faster To Be Integrated into Applications

CM4 socket suitable for all variants of Compute Module 4
Networking Gigabit Ethernet RJ45 connector
Connector M.2 M KEY, supports communication modules or NVME Solid State Drives
Raspberry Pi 40PIN GPIO header
USB USB 2.0 Type A × 2
Display LCD port (40pin 0.5mm FPC connector)
Camera MIPI CSI-2 camera port × 2 (15pin 1.0mm FPC connector)
Video HDMI port, supports 4K 30fps output
RTC Real-time clock with battery socket and ability to wake Compute Module 4
Storage TF card socket for Compute Module 4 Lite (without eMMC) variants
Fan header allows speed adjustment, 5V
Power input 5V
Dimensions 85 × 56mm
What's the differences
CM4 Base BoardInterface count and specifications

      2.0×1     ×1     5V CM4 sized

  ×1   2.0×1 ×1 ×1 ×1     5V CM4 sized

      2.0×1 ×1 ×1 ×1     5V Onboard Camera

      M.2 M 2.0×1   ×1 ×1     5V Arduino compatible

mini Base A
  ×1 M.2 M 2.0×4 ×1 ×2 ×2   5V 5V mini size

mini Base B
  ×1 M.2 M 2.0×4 ×1 ×2 ×2 5V 5V mini size

mini Base C
  ×1 M.2 M 2.0×2   ×1 ×2 5V 5V Dedicated 40PIN LCD Connector

Touch screen
  ×1   M.2 M 2.0×4   ×1 ×1     5V IPS screen

Mini Dual Gigabit
  ×2   2.0×1         5V SH1.0 5V dual ETH

Binocular camera
  ×1 M.2 M 2.0×4   ×2       5V dual 8MP

4CH RS485
  ×1     2.0×2   ×1 ×2 ×1 5V 7-36V dual ETH

Dual Gigabit ETH
  ×2   3.0×3 ×1 ×2 ×2 5/12V 7-36V  

IoT Dual Gigabit ETH
  ×2   3.0×2 ×1 ×2 ×2 5/12V 5V 5G/4G support

IoT Base
×1   Gen2×1 2.0×2 ×2 ×2 ×2 5/12V 7-36V 5G/4G support

PoE Base (B)
×1 Gen2×1 2.0×4 ×2 ×2 ×2 5/12V 5V RS232

PoE UPS Base
×1 M.2 M 2.0×4 ×1 ×2 ×2 5/12V 7-36V UPS

PoE Base
×1   3.0×4 ×2 ×2 ×2 5/12V 7-36V  

Raspberry Pi official
×1 Gen2×1 2.0×4 ×2 ×2 ×2 12V 12V  

Wireless base
  ×1   M.2 B /
2.0×3   ×1 ×1 5/12V 5V or
5G/4G support

5″ touch screen
×1 M.2 M 2.0×4   ×1 ×2 5/12V 5V  

7″ all-in-one
  ×1   M.2 M 2.0×4 used ×1 used 5/12V
7-36V touch screen
Note ① USB 3.0 is equivalent to USB 3.2 Gen1
② There's PoE header only on the Raspberry Pi official IO board without PoE circuit, that means additional PoE module is required for the official IO board to enable PoE feature.
Unless otherwise specified, the PoE feature here stands for integrating 802.3af-compliant PoE circuit (5V/2.5A).
Connecting with Compute Module 4

standard CM4 socket and color-coded Raspberry Pi 40PIN GPIO header
suitable for Compute Module 4 Lite/eMMC series module

Compact, yet Complete
Application example

Working With an HDMI Display

Working With An Additional Solid State Drives

for reference only, CM4, display, and Solid State Drives are NOT included.
What's On Board
  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. LCD Port
    40PIN LCD display port, for direct connection to 70H-1024600 series display
  4. FAN
    for connecting cooling fan, allows speed adjustment via IO ports
  5. CAM
    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 sorts of 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. PWR indicator
    indicating the status of Raspberry Pi power supply
  11. ACT indicator
    indicating the operating status of Raspberry Pi
  1. Boot switch
    ON: CM4 would be booted from USB-C interface
    OFF:CM4 would be booted from eMMC or TF card
  2. 40PIN GPIO header
    for connecting sorts of HAT
  3. TF card slot
    for connecting a TF card with pre-burnt image (Lite variant ONLY)
  4. FE1.1S
    USB HUB chip, support expanding USB port
  5. M.2 slot
    supports sorts of NVME Solid State Drives, or communication modules with PCIE M.2 KEY-M interface
  6. RTC chip
    allows RTC-related functions like wakeup, shutdown, reboot, and more
  7. RTC interrupt selection
    GN-EN: CM4 shutdown(by default) on RTC interruption
    PI-RUN: CM4 reboot on RTC interruption
    D4: D4 pin is triggered on RTC interruption
  8. RTC battery holder
    supports CR1220 button cell
Outline dimensions
Resources & Services

* Resources for different product may vary, please check the wiki page to confirm the actually provided resources.

Weight: 0.051 kg

Quick Overview

  1. CM4-IO-BASE-C x1
  2. Solid State Drives mounting screw x1