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The breakout board is based on the MCP2221A, a USB-to-UART/I2C converter. The chip is similar to a USB to serial converter but it also adds a GPIO and I2C interface. The analog/digital GPIO pins can act as 10-bit analog inputs (ADC), and there is a 5-bit DAC output included.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.