---
name: "tda"
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/tda/4"
---

# tda(4)

Philips TDA8444 fan controller

## NAME

**tda** – Philips TDA8444 fan controller

## SYNOPSIS

**tda\* at iic?**

## DESCRIPTION

The **tda** driver supports the TDA8444 DAC to adjust the output voltage to the fans on Sun Blade 1000/2000 machines.

The driver watches the internal and external temperature provided by the sensors framework and adjusts the fan speeds accordingly.

## SEE ALSO

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

## HISTORY

The **tda** driver first appeared in OpenBSD 4.3.

## AUTHORS

The **tda** driver was written by Robert Nagy ⟨*robert@openbsd.org*⟩ and Mark Kettenis ⟨*kettenis@openbsd.org*⟩.