Template: Compute Module 4 PoE Board B Spec

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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-PoE-Board-B-details-size.jpg
Compute_Module 4
Compute Module 4 IO Board 5.png

What's on board

Compute-Module-4-PoE-Board-B-details-intro.jpg Compute-Module-4-PoE-Board-B-details-intro2.jpg

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