Mini Base Board (B) / Mini-Computer designed for Raspberry Pi CM5

Waveshare 31233 - Mini Base Board (B) - Mini-Computer Version - Designed for Raspberry Pi Compute Module 5 (NOT Included), Onboard EEPROM and Encryption Chip - CM5-IO-BASE-BOX-B (US)

The Waveshare CM5-IO-BASE-B Mini Base Board transforms your Raspberry Pi Compute Module 5 into a powerful mini-computer. This compact (85 × 56 mm) board packs dual USB 3.2 Gen 1, USB 2.0, dual 4K HDMI (one via FFC), Gigabit Ethernet, M.2 (2230/2242) NVMe support, MIPI CSI/DSI, plus built-in EEPROM and ATSHA204 encryption—perfect for secure, versatile embedded and development projects. Compatible with all CM5 variants.

Specifications

CM5 socket

suitable for all variants of Compute Module 5

Networking

Gigabit Ethernet RJ45 connector

Connector

M.2 M KEY (2230 / 2242)

Raspberry Pi 40PIN GPIO header

USB

USB 3.2 Gen1 Type-A × 2, USB 2.0 × 2 (6PIN 1mm FFC connector)

MIPI

4-lane MIPI interface × 2 (22pin 0.5mm FFC connector)

Video

HDMI port × 2 (including one port via FFC connector), supports dual 4K outputs

Storage

TF card slot for Compute Module 5 Lite (without eMMC) variants

Fan header

5V, 4PIN JST-SH PWM connector

Others

Onboard EEPROM and Encryption chip

Power input

DC 5V 5A

Dimensions

the base board: 85 × 56mm

with metal case: 90 × 68mm

Compact, yet Complete

Onboard multiple connectors, more convenient to use

Precise cut-out with clear label

Each cut-out is completely aligned with the connector

Cooling fan included

Comes with cooling fan, combined with the airflow vent, better heat dissipation

What's On Board

1. CM5 socket
   suitable for all variants of Compute Module 5
2. 40PIN GPIO header
   for connecting various HAT / HAT+ modules
3. Power input/Programming
   5V / 5A power supply, or used for eMMC burning
4. Encryption chip (ATSHA204)
   Supports fast and secure symmetric authentication
5. PSW Power button
   Long press to force power off, short press to soft power off or on
6. STAT LED
   Dual-color status LED
7. BOOT button
   Press before powering on and release after powering on to enter the burning mode
8. Dual MIPI interfaces
   for connecting DSI displays and CSI cameras
9. HDMI0 connector
   HDMI0 port, supports 4K output
10. USB 3.2 Gen1 ports
    2x USB 3.2 Gen1 high-speed ports, supports 5Gbps synchronous operation
11. RJ45 Gigabit Ethernet port
    Supports 10M / 100M / 1000M network access
12. 4PIN JST-SH PWM Fan header
    for connecting cooling fan, 5V power supply
13. TF card slot
    for connecting a TF card with pre-burnt image (Lite variant ONLY)
14. IO-VREF selection
    CM5 IO logic level: 3.3V (default) or 1.8V
15. Other function pins
    WIFI / BT hardware disable or write protection
16. HDMI1 FFC connector
    HDMI1 port, supports 4K output, can be connected through an adapter
17. USB 2.0 FFC connector
    can be connected through an adapter
18. RTC battery holder
    Supports CR / ML1220 button cell
19. M.2 M KEY
    Supports 2230/2242 NVMe Solid State Drives and booting Pi5 from solid state drive
20. I2C selection
    switching I2C0 and I2C1 (by default) for the encryption chip and EEPROM
21. CAT24C32
    EEPROM chip

Outline dimensions

WIKI: www.waveshare.com/wiki/CM5-IO-BASE-B

Package Content

1. CM5-IO-BASE-B x1
2. Metal case (top and bottom) x1
3. Antenna connector rubber plug x1
4. EVA foam pad x1
5. CM5-FAN-4010-5V x1
6. Rail-mount buckle x1
7. Screws pack x1
8. Screwdriver x1
9. 27W Power Supply x1