We’ve gotten used to the GPIO-available functions of Raspberry Pi ... the Raspberry Pi 4 has six SPI controllers, six I2C controllers, and six UARTs – all on its 40-pin header.

Standards like UART, USB2, I2C, SPI, PS/2, CAN ... so you can put two of these devices on the same bus, and GPIO expanders tend to have three pins that result in eight possible addresses.

This flip-chip compatible library in Dongbu HiTek 130nm features a fail-safe GPIO, two standard GPIOs, a 5V GPI, and 5V I2C-compliant ODIO. The GFGPIO is a highly configurable 5V tolerant, ...

3.3V LVDS TX & RX cells, along with 3.3V OTP programming, 3.3V I2C open drain and analog cells complement the GPIO offering. The library is enriched with feed-through, filler, corner and domain-break ...