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

2026-09-06T06:04:02Z

Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

Neue Seite

__NOINDEX__
'''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 ==
Base board for the Raspberry Pi Compute Module 4 with PoE power supply, USB and HDMI ports, and integrated UPS functionality.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL22116 WSAL22116 – PoE UPS Base Board/Mini-Computer Designed for Raspberry Pi Compute Module 4, Gigabit Ethernet, Dual HDMI, Quad USB2.0]
* [https://shop.jw-tech.eu/p/WSAL22849 WSAL22849 – PoE UPS Base Board/Mini-Computer Designed for Raspberry Pi Compute Module 4, Gigabit Ethernet, Dual HDMI, Quad USB2.0]
* [https://shop.jw-tech.eu/p/WSAL22850 WSAL22850 – PoE UPS Base Board/Mini-Computer Designed for Raspberry Pi Compute Module 4, Gigabit Ethernet, Dual HDMI, Quad USB2.0]

== Technical overview ==
* The board supports PoE power supply (802.3af) and a DC input of 7 to 36 V.
* Four USB 2.0 ports are present; the USB interface is disabled by default and enabled via dtoverlay=dwc2,dr_mode=host.
* The BOOT switch controls CM4 startup mode: ON enters programming mode, OFF starts the system normally.
* Two HDMI outputs allow connection of external displays.
* An I²C bus (I2C-10) carries an RTC chip PCF85063A (address 0x51) and a fan controller EMC2301 (address 0x2f).
* When operating an external fan, the voltage (5 V or 12 V) must be verified before connecting; the FAN_VCC jumper sets the default voltage.
* The device provides integrated battery monitoring via the INA219 chip on I²C bus 10, address 0x43.
* On first battery connection, no power output may occur until the BOOT button is pressed or the battery is charged to activate the protection chip.

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
dtoverlay=dwc2,dr_mode=host
dtparam=i2c_vc=on
dtoverlay=i2c-rtc,pcf85063a,i2c_csi_dsi
sudo hwclock -w
sudo hwclock -s
sudo hwclock -set -date="9/8/2021 16:45:05"
sudo hwclock -r
dtoverlay=i2c-fan,emc2301,i2c_csi_dsi,midtemp=45000,maxtemp=65000
i2cdetect -y 10
libcamera-hello --list-cameras
libcamera-hello -t 0
libcamera-jpeg -o test.jpg
libcamera-vid -t 10000 -o test.h264
</syntaxhighlight>

== Notes and version constraints ==
* The fan must be connected before powering on the expansion board; connecting it after power-on can damage the control chip.
* If the battery polarity is reversed, the WARNING LED lights up; do not charge in this state.
* Sustained currents above 4 A can cause overheating; ensure adequate cooling.
* Plugging or unplugging devices other than USB and HDMI while powered on is prohibited.
* If the battery's positive insulating pad is damaged, discontinue use; when removing the battery, do not pry the positive terminal with a screwdriver.
* Lithium batteries have a limited cycle life; replace them at end of rated life or after two years.
* Under heavy load with low battery voltage the system may restart repeatedly; the demo code includes automatic shutdown after about 60 s if charging is unavailable.

== Source and revision record ==
* [https://www.waveshare.com/wiki/CM4-POE-UPS-BASE CM4-POE-UPS-BASE - Waveshare Wiki]
* Source revision: 104259
* Captured: 2026-09-03T03:40:33+00:00
* SHA-256: <code>77e9965966fd628a1d9ab31601f018fbfaaab45331b7bdf61468a037297f7362</code>

WSAL22116 – CM4-POE-UPS-BASE/en - Versionsgeschichte

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