NOTICE - Beginning in August 2020, production began transitioning from the Compute Module 3 Lite (CM3L) to the Compute Module 3+ Lite (CM3+L). Use the command cat /proc/device-tree/model to verify the precise hardware. If you are using an older operating system you many need to update the Raspberry Pi Firmware for it to boot.

• Initial release

• Unused USB Port is removed.

• 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.

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

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

• 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.

• 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, conductive pads were added during assembly to improve EMI performance
• [CPi-A102xx] Beginning in June 2021, conductive pads were added during assembly to improve EMI performance

• Initial Release

• Changes to support eMMC
• Improved I2C circuit.

• Initial Release

• Improved I2C circuit

• Initial release

• Improved I2C circuit