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

SKU: 19602
Part Number: CM4-IO-BASE-B
Brand: Waveshare


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Mini Base Board (B) designed for Raspberry Pi Compute Module 4
Mini Base Board for Compute Module 4

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

Powerful functions in a credit card sized body

What's the differences
CM4 IO Board
mini Base

Dual Gigabit ETH

PoE Base (B)

PoE Base

Raspberry Pi official
Lite Ver. Full Ver.
PoE N/A integrates 802.3af-compliant PoE circuit (5V/2.5A) PoE header only
USB USB 2.0 × 2
USB 2.0 × 2 (via FFC connector)
USB 3.2 Gen1 × 3 USB 2.0 × 4 USB 3.2 Gen1 × 4 USB 2.0 × 4
(2x via pin header)
GPIO Raspberry Pi 40PIN GPIO × 1
Header M.2 slot × 1 N/A RS485 × 1
RS232 × 1
PCIe Gen 2 × 1
N/A PCIe Gen 2 × 1
(1x via FFC connector)
supports 4K 30fps output
HDMI × 2
supports 4K 30fps output
DSI Display MIPI DSI × 1
(15pin 1.0mm FPC)
(15pin 1.0mm FPC)
(22pin 0.5mm FPC)
CSI Camera MIPI CSI-2 × 2
(15pin 1.0mm FPC)
MIPI CSI-2 × 2
(22pin 0.5mm FPC)
Power Input 5V 7V~36V 5V 7V~36V 12V
Fan 5V 5V / 12V 12V
no fan control allows speed adjustment and measurement
RTC N/A Real-time clock with battery socket and ability to wake Compute Module 4
RJ45 Ethernet Gigabit Ethernet Dual Gigabit 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 × 56.0 109.0 × 91.5 124.50 × 108.80 160 × 90
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

onboard multiple connectors including:
CSI/DSI/RTC/FAN/HDMI/USB/RJ45 Gigabit Ethernet/Micro SD Card Slot/M.2 Slot

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. DISP
    MIPI DSI display port
  4. FAN
    for connecting cooling fan, allows speed adjustment and measurement
  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. 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
  1. 40PIN GPIO header
  2. Micro SD card slot
    for connecting a Micro SD card with pre-burnt image (Lite variant ONLY)
  3. HDMI1 FFC connector
    HDMI1 port, supports 4K 30fps output
  4. USB 2.0 FFC connector
    can be connected through an adapter
  5. FE1.1S
    USB HUB chip, expanding one USB port to 4x ports
  6. M.2 slot
    supports sorts of NVME SSD, or communication modules with PCIE M.2 KEY-M interface
  7. RTC chip
    allows RTC-related functions like wakeup, shutdown, reboot, and more
  8. RTC interrupt selection
    PI-RUN: CM4 reboot on RTC interruption
    GN-EN: CM4 shutdown on RTC interruption
    D4: D4 pin is triggered on RTC interruption
  9. EMC2301
    fan controller, for speed adjustment / measurement
  10. RTC battery holder
    supports CR1220 button cell
Outline dimensions
Application example
for reference only, CM4, display, and cameras are NOT included.
Resources & Services

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

Weight: 0.049 kg

Quick Overview

  1. CM4-IO-BASE-B x1
  2. SSD mounting screw x1