2 open source boards using the PCA9557
Real designs built with the PCA9557, from public GitHub projects: a quick way to see how others power, decouple and connect it. Each board comes with its KiCad files, full parts list and a render — and you can simulate its firmware on HardLabs.
greearb
JensLiuThe PCA9557 in open source designs
The gallery holds 2 open source boards using the PCA9557 from 2 GitHub repositories; a typical one measures about 120 × 75 mm and carries around 152 components.
100% carry an open source license.
The most starred is Operacake by greearb.
Parts used alongside the PCA9557
What boards using the PCA9557 are built for
PCA9557: common questions
Where can I find a PCA9557 reference design?
Each of the 2 boards on this page is a real design using the PCA9557. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
What parts are used alongside the PCA9557?
The 74AHC1G02, 74AHC1G08, 74LVC1G19, 74LVC1G58 and MASWSS0129 appear in the most repositories here.
How big is a typical board using the PCA9557?
The median is 120 × 75 mm.
What is the most popular open source board using the PCA9557?
By GitHub stars, Operacake by greearb, with 1 stars.
Can I simulate one of these boards using the PCA9557 before building it?
Yes. HardLabs turns a board's netlist and BOM into a working simulation, so you can boot and test firmware against it with no hardware on your desk.