Template: Compute Module 4 PoE Board B Spec
Overview
This is an IO board for evaluating the Raspberry Pi CM4 or being integrated into end products. the board features the PoE function (Type B), which can be used for all variants of CM4.
Precautions for use
1: It is forbidden to unplug and plug any equipment other than USB and HDMI when power is on
2: Confirm the fan voltage before connecting. It supports 5V and 12V. The default connection is 5V. Please modify the jumper of FAN_VCC
3: Type C interface can be used for power supply or USB SLAVE interface for burning image.
4: In order to ensure the normal power supply of CM4, please do not connect other devices when using the Type C interface to burn the image.
5: When CM4 is in normal use, it needs to provide 5V 2A power supply for CM4. Otherwise, problems such as automatic shutdown, frequency reduction, etc. may occur.
6: USB2.0 is closed by default, if you need to open it, you need to add dtoverlay=dwc2,dr_mode=host
Dimension
Compute_Module 4 POE Board (B)
Compute_Module 4
What's on board
No. | Component | Description |
1 | CM4 socket | Suitable for all variants of Compute Module 4 |
2 | 40PIN GPIO header | ~ |
3 | BOOT selection | ON: CM4 would be booted from USB-C interface OFF: CM4 would be booted from eMMC or Micro SD card |
4 | Misc functional pins | ~ |
5 | USB Type-C power supply / programming | 5V/2.5A power supply, also allows burning system image into Compute Module 4 eMMC variants |
6 | Status indicators | ACT: Raspberry Pi operating status indicator PWR: Raspberry Pi power indicator |
7 | DISP | 2x MIPI DSI display port |
8 | CAM | 2x MIPI CSI camera connectors. |
9 | USB2.0 ports | 4x USB2.0 ports, for connecting sorts of USB devices |
10 | HDMI ports | 2x HDMI ports, supports dual 4K 30fps output |
11 | RTC battery holder | supports CR1220 button cell |
12 | FAN header | for connecting cooling fan, allows speed adjustment and measurement |
13 | PCIe Gen 2 × 1 socket | forconnecting PCIe Gen 2 × 1 modules |
14 | Gigabit Ethernet connector | Gigabit Ethernet RJ45 with PoE support, 10/100/1000M compatible |
15 | DC 5V output | ~ |
16 | RS485 | with 600W lightning-proof, anti-surge, and 15KV ESD protection, reversed optional 120R balancing resistor jumper |
17 | RS232 | with TVS diode, anti-surge, and ESD protection |
18 | Buzzer | ~ |
19 | FAN_VDD/PoE selection | cooling fan driving voltage: 12V or 5V PoE: enable (EN) or disable (DIS) |
20 | FE1.1S | USB expansion chip |
21 | PCF52063ATL | RTC chip |
22 | RTC/FAN | I2C bus switch, SDA0/SCL0: I2C-10 is shared with CSI/DSI GPIO3/2: I2C-1 is shared with 40PIN header |
23 | IO logic level selection | set the CM4 IO logic level as 3.3V or 1.8V |
24 | RTC interruption configuration | PI-RUN: CM4 will reboot on RTC interruption GN-EN: CM4 powerdown on RTC interruption D4: D4 pin is triggered on RTC interruption |
25 | Micro SD card slot | insert a Micro SD card with pre-burnt system, to start up Compute Module 4 Lite |