4 layers88 × 35.8 mm

Boards in 1 GitHub repository, designed in KiCad, that use the PCA9557RGVR by Texas Instruments (-40℃~+85℃ 2.3V~5.5V 400kHz 8 I2C、SMBus No Interrupt Output Reset function、Cascading and address extension、Built-in LED driver QFN-16-EP(4x4) I/O Expanders ROHS). See how each wires it, with its parts, size, README and files; the PCA9557RGVR’s symbol, footprint and pinout are on its own page.
