Feature：
1. MULTI INTERFACE： Based on for Raspberry Pi CM4 design with UPS industrial expansion module, the board has Gigabit Ethernet, HD multimedia interface, USB and GPIO and other common interfaces.
2. M.2 B KEY INTERFACE： Wireless expansion module supports the external connection of 4G5G wireless communication modules through M.2 B KEY, and also extends industrial interface resources such as RS485, CAN and RTC.
3. AUTOMATIC SWITCHING： Expansion module access to external power supply, will simultaneously power the system and lithium battery charging disconnect the external power supply, will automatically switch to lithium battery power supply, on board UPS module, disconnect the power line can still work normally.
4. APPLICATIONS： The industrial rail housing design is very suitable for building IoT gateways, 4G5G routers, IoT data acquisition, or even using it as a programmable logic controller in industrial automation and control systems, etc.
5. PCB MATERIAL： CM4 industrial expansion module is made of PCB material, which will not deform for a long time, thus ensuring the stability for a long time.
Specification：
Item Type： Industrial IoT Wireless Expansion Module
Material： PCB
CM4 Connector： Available for All Versions for Compute Module 4
HD Multimedia Interface： HD Multimedia Interface, Supports 4K 30fps Output
RJ45 Gigabit LAN Port： RJ45 Gigabit LAN Port, Supports 101001000M Network Access
DC Power Supply Interface： 7 to 36V DC Power Supply Interface
CM4 Status Indicator：
Red Light (PWR)： for Raspberry Pi Power Indicator
Green Light (ACT)： for Raspberry Pi Operating Status Indicator
4G5G Module Status Light：
Red(STA)： for Module Enable Indicator
Green Light (NET)： Module Operation Status Light
PWR USB Interface： 5V DC Power Supply Interface or USB Burns in Interface
M.2 B KEY： Support Access to 4G5G or Other USB Channel Communication Module
SIM Card Holder： Can Access Standard SIM Card for 4G3G2G Internet Access
BOOT SWITCH BUTTON：
ON： for Compute Module 4 Boot up and Boot Transfer to USB Type C Interface
OFF： Boot Up for Compute Module 4 to eMMC or Micro Storage Card
UPS Switch Button： ON
ON： Turn on the UPS to Power the CM4
OFF： Turn off the UPS to Power the CM4
DC Power Supply Interface： 7 to 36V DC Power Supply Interface
Micro Storage Card Interface： for Access to Micro Storage Card with System to Boot for Compute Module 4 Lite
CAM Interface： MIPI CSI Camera Interface
RTC Battery Connector： Access to CR1220 Coin Cell Battery
RTC Interrupt Pin Switching： PI-RUN
PI-RUN： RTC Trigger Interrupt CM4 Restart
GN-EN： RTC Trigger Interrupt CM4 Power Off
D4： RTC Trigger Interrupt D4 Pin
System Function Switching：
BT_DIS： Bluetooth Disable, only for CM4 Version with Antenna
WiFi_DIS： WiFi Disable, only for CM4 Version with Antenna
WP_DIS： Boot Mode Toggle, For Use Only if EMMC Boot or Storage Card boot is Not Used
RTCFAN I2C Bus Selection： SDA0SCL0： I2C-10 and CSIDSI Shared
GPIO32： I2C 1 and 40PIN Shared
Partial GPIO Interface： Contains One Set of I2C and 2 GPIOs and Power Supply
UPS Module Mini Interface： Uses 10440 3.7V Lithium Battery
Battery Specifications： 3x10440 Li Ion 350mAh (Ship with Inbuilt Battery).
Package List：
1 x Expansion Module (Ship with Inbuilt Battery)3 x Battery1 x Screwdriver
Note：
1. Prohibit unplugging any device other than USB and HD Multimedia Interface when powered2. Confirm the fan voltage before connecting, support 5V and 12V connect 12V by default, switch please modify the FAN_VCC resistance3. In order to ensure the CM4 power supply is normal, please do not connect other devices when using Type C interface to burn the image.4. The module needs to be supplied with 5V 2.5A 12V 1A or higher power supply. Otherwise, there may be automatic shutdown, downconversion and other problems.The UPS module"s power switch needs to be set to the OFF position and the CM4 backplane switch to the ON position to use.6. USB2.0 is off by default7. When using the UPS alone, the circuit should not exceed 2.5A, long working hours in the 2.5A state will heat up, pay attention to heat dissipation.8. External power supply must be greater than the entire system power, otherwise there is not enough current to charge the battery for a long time, the battery power is getting low until shutdown.9. When the system load is large and the battery voltage is low, there may be insufficient battery current and cause the system to restart constantly.10. The battery is relatively strong, disassembly needs to be accompanied by tools (screwdriver), do not use a screwdriver to pry the battery positive pole easily leading to short circuit, to pry the battery negative pole.
