Boards in 2 GitHub repositories, designed in KiCad, that use the PCA9555DB by Texas Instruments (-40℃~+85℃ 10mA 16 1uA 2.3V~5.5V 25mA 400kHz 4V 8 I2C、SMBus Interrupt Output Push-Pull Reset function、Cascading and address extension、Built-in LED driver SSOP-24-208mil I/O Expanders ROHS). See how each wires it, with its parts, size, README and files; the PCA9555DB’s symbol, footprint and pinout are on its own page.
oxidecomputer/hw-gimletlet
More full-featured breakout board for the STM32H7, including many expansion headers for daughter boards. In active use for Hubris development and as a Swiss Army Knife around the lab
