• Improved the surge protection circuit on the serial ports.

• Replaced SMSC9512 10/100 Ethernet with CM4's 1Gbps internal Ethernet. Please remove the dtoverlay=noeth setting in the /boot/config.txt file.
• Replaced 9514 USB/Ethernet IC with USB hub IC
• OS 20230227 or later is recommended.

• Initial release

• Improved the surge protection circuit on the serial ports.

• Added support for CM4S modules

• Added USB device protection circuit

• Voltage regulator component change

• PCB layout (solder mask) improvements.
• Some manually applied changes in v2.3 are now permanent and applied during fabrication
• [CPi-A070xx] Beginning in June 2020, modifications to improve EMI performance
• [CPi-A102xx] Beginning in June 2021, modifications to improve EMI performance

• Improved I2C circuit
• Improved SD Card support
• Most recent production has a 4th USB port for programming Compute Modules with an eMMC
• Beginning in October 2020, production began populating the RS-485 port with 1kΩ bias resistors.

• COM1 has been changed from RS-232 to RS-485
• Use OS 20170828 or later.

• RTC IC is populated.
• Added backlight brightness control feature (GPIO31)
• Use OS 20170828 or later.

• Added Enable/Disable function for level shifter IC (TXS0108E). Needs bt-blob.bin file at /boot folder.
• Populated R33 for backlght On/Off feature (GPIO34).
• Added RTC cirucuit. However, the RTC IC is not populated.
• Use OS 20170703 or later.

• Unused USB Port is removed.

• Initial release

• Improved the surge protection circuit on the serial ports.

• Added support for CM4S modules

• Added USB device protection circuit

• Voltage regulator component change

• Improved I2C circuit

• Initial Release

• Added support for CM4S modules

• Voltage regulator component change

• Improved I2C circuit

• Initial release

• Voltage regulator component change

• Modifications to improve EMI performance

• Changes to support eMMC
• Improved I2C circuit.

• Initial Release

ComfilePi - Industrial Raspberry Pi Panel PC