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Maxim's MAXREFDES72 Reference Design is a Pmod™ adapter for the Arduino platform that addresses incompatibility issues in standards for prototyping platforms. The MAXREFDES72 consists of the MAX14661 Beyond-the-Rails™ 16:2 multiplexer, two MAX14611 level shifters, and the DS3231M real-time clock. The board is configured by writing to the MAX14661 multiplexer over the I²C bus. Eight Arduino digital GPIO are connected to the Pmod connector through level shifters and each of these 8 signals are also connected to the multiplexer. The 8 digital signals were chosen so that the Arduino Uno R3 SPI signals are connected for the Pmod Type 2 and to avoid the I²C and UART signals at the Arduino headers. For Type 1 (GPIO) and Type 2 (SPI), no configuration is necessary. To implement Type 3, Type 4, I²C, or other custom pin mappings that need access to I²C, UART, or other real time functions such as PWM, configure the multiplexer to route the signals to the appropriate pins.