What is the Raspberry Pi Compute Module 4?
The Compute Module 4 is officially launched on 19 October 2020, and there are 32 different variants to choose from.
The Raspberry Pi Compute Module 4 (CM4) and Compute Module 4 Lite (CM4Lite) are loosely based on the Raspberry Pi 4 Model B. The CM4 includes a cost-effective option for applications that do not require eMMC; this version is called the CM4Lite. The form factor of the new CM4 and CM4L differs from previous Compute Modules, which all shared the same form factor. The change was necessary to add new interfaces: a second HDMI, PCIe and Ethernet. Adding these new interfaces, especially PCIe, would not have been possible if the older form factor had been retained. Instead, the CM4’s electrical connection is via two 100-pin high-density connectors. Moving to the newer form factor has reduced the footprint. The overall footprint of the CM4, including the socket, is smaller thanks to the new form factor.
What is on the board?
- 10x GPIO LEDs
- 1x microSD card slot
- 1x CSI camera port
- 1x DSI display port
- 5x Grove ports
- 2x GPIO ports (GPIO 5, 6 & 23, 24)
- 1x PWM port (GPIO 12, 13)
- 1x UART port (GPIO 14, 15)
- 1x I2C port (GPIO 2, 3)
- 1x Maker port (JST-SH 4-pin connector)
- 3x user buttons
- 1x Analog audio output
- 1x Piezo buzzer
- 1x Buzzer mute switch
- 2x Power buttons
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- 1x RTC battery holder
- 1x PCF85063A RTC
(Note: DSI & CSI are disabled when using the RTC).
- 1x external power button connector
- 1x power-on switch
- 1x M.2 connector
- 2x M.2 mounting holes
- 1x USB-C
- 1x HDMI
- 4x USB 2.0 hosts
- 1x Gigabit Ethernet
- 1x CM4 connector
- GPIOs breakout
- 1x DC power jack
- 4x status LEDs
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Package contents
- 1x CM4 Maker Board
- 4x Silicone bumpers
Links
