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WSAL22116 – CM4-POE-UPS-BASE/en

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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

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

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:  

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

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

  • CM4-POE-UPS-BASE - Waveshare Wiki
  • Source revision: 104259
  • Captured: 2026-09-03T03:40:33+00:00
  • SHA-256: 77e9965966fd628a1d9ab31601f018fbfaaab45331b7bdf61468a037297f7362
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