---
name: "pcamux"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/pcamux"
---

# pcamux(4)

Philips PCA954\[678\] I2C switch/mux

## NAME

**pcamux** – Philips PCA954\[678\] I2C switch/mux

## SYNOPSIS

**pcamux\* at iic?** **iic\* at pcamux?**

## DESCRIPTION

The **pcamux** driver provides support for the Philips PCA954\[68\] I2C switch and Philips PCA9547 I2C mux, which is used with the [iic(4)](/iic/4.md) framework.

## SEE ALSO

[iic(4)](/iic/4.md), [intro(4)](/intro/4.md)

## HISTORY

The **pcamux** driver first appeared in OpenBSD 6.8.

## AUTHORS

The **pcamux** driver was written by Mark Kettenis ⟨*kettenis@openbsd.org*⟩.