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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

== Summary ==
The CM4-IO-BASE-B is a base board for the Raspberry Pi Compute Module 4 (CM4/CM4L). It provides power, USB, HDMI, Ethernet, M.2, DSI/CSI and GPIO connectivity.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL19602 WSAL19602 – Mini Base Board (B) Designed for Raspberry Pi Compute Module]
* [https://shop.jw-tech.eu/p/WSAL20185 WSAL20185 – Mini-Computer Based on Raspberry Pi Compute Module 4 (NOT Included), Mini IO Board Full Ver, Metal Case, with Cooling Fan]
* [https://shop.jw-tech.eu/p/WSAL20256 WSAL20256 – Mini-Computer Based on Raspberry Pi Compute Module 4 (NOT Included), Mini IO Board Full Ver, Metal Case, with Cooling Fan]
* [https://shop.jw-tech.eu/p/WSAL20270 WSAL20270 – CM4-IO-BASE-B + USB HDMI Adapter, for Raspberry Pi Compute Module 4]
* [https://shop.jw-tech.eu/p/WSAL20272 WSAL20272 – CM4-IO-BASE-BOX-B + USB HDMI Adapter, for Raspberry Pi Compute Module 4]
* [https://shop.jw-tech.eu/p/WSAL24008 WSAL24008 – Mini-Computer Based on Raspberry Pi Compute Module 4 (NOT Included), Mini IO Board Full Ver, Metal Case, with Cooling Fan]
* [https://shop.jw-tech.eu/p/WSAL24009 WSAL24009 – CM4-IO-BASE-BOX-B + USB HDMI Adapter, for Raspberry Pi Compute Module 4]
* [https://shop.jw-tech.eu/p/WSAL24010 WSAL24010 – CM4-IO-BASE-BOX-B + USB HDMI Adapter, for Raspberry Pi Compute Module 4]

== Technical overview ==
* Compatible with all versions of the Compute Module 4 via its dedicated CM4 connector.
* Powered through a USB-C port at 5 V / 2.5 A; the same port also serves as an eMMC image-programming interface.
* Four hardware revisions exist from V1.0 to V4; V4 fixes BT-DIS/WIFI-DIS silkscreen/pin mismatches and moves the display path from DSI0 to DSI1.
* Available interfaces include two USB 2.0 ports, Gigabit Ethernet, two HDMI ports rated 4K@30 fps, an M.2 Key-M connector for PCIe devices, a 40-pin GPIO header, and a TF-card slot available only on the Lite variant.
* The fan header supports 5 V fans exclusively; do not connect a 12 V fan.
* RTC functions use the PCF85063 chip on I2C-10 at address 0x51; the EMC2301 fan controller is also on I2C-10 at address 0x2F.
* DSI display: default resolution is 800×480; V4 uses DSI1 while earlier versions use DSI0.
* CSI cameras: single-port cameras operate only on CAM0; dual-camera setups require both ports.
* When running Bookworm, certain jumpers on the official base board must remain closed; otherwise the system may fail to boot.
* The M.2 connector supports only PCIe-channel devices such as NVMe SSDs; SATA drives are not supported.

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
sudo nano /boot/config.txt
dtparam=i2c_vc=on
dtoverlay=i2c-rtc,pcf85063a,i2c_csi_dsi
#dtparam=audio=on
sudo reboot
sudo hwclock -w
sudo hwclock -s
sudo hwclock --set --date="9/8/2021 16:45:05"
sudo hwclock -r
sudo hwclock --verbose
dtoverlay=dwc2,dr_mode=host
dtoverlay=i2c-fan,emc2301,i2c_csi_dsi,midtemp=45000,maxtemp=65000
i2cdetect -y 10
libcamera-hello --list-cameras
libcamera-hello -t 0
sudo raspivid -t 0 -cs 0
sudo raspivid -t 0 -cs 1
</syntaxhighlight>

== Notes and version constraints ==
* No protection circuitry is present: avoid short-circuiting the power supply.
* This expansion board does not support PoE.
* While powered on, do not plug or unplug any device other than USB and HDMI.
* A 5 V 2 A power supply is required for stable CM4 operation; otherwise automatic shutdowns or frequency reductions may occur.
* Use matching screws when attaching the M.2 connector; incorrect screw lengths can damage the CM4.
* Connect the fan before powering on the board; connecting it after power-on can damage the control chip.
* The RTC battery (CR1220) must be properly seated and charged, otherwise RTC values will be invalid.
* Kernel version must be at least 6.1.31 for fan functionality.
* DSI and CSI usage are prohibited while RTC configuration is active.

== Source and revision record ==
* [https://www.waveshare.com/wiki/CM4-IO-BASE-B CM4-IO-BASE-B - Waveshare Wiki]
* Source revision: 105209
* Captured: 2026-09-02T02:35:00+00:00
* SHA-256: <code>1050f5c08c5bb2045cd38b209cd2235d7957f87310770db58d86a47d1908e845</code>

WSAL19602 – CM4-IO-BASE-B/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex