---
name: "it"
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/it"
---

# it(4)

ITE IT87xxF and SiS SiS950 temperature, voltage, and fan sensor with watchdog timer

## NAME

**it** – ITE IT87xxF and SiS SiS950 temperature, voltage, and fan sensor with watchdog timer

## SYNOPSIS

**it\* at isa? port 0x2e** **it\* at isa? port 0x4e**

## DESCRIPTION

The **it** driver provides support for the ITE IT8705F, IT8712F, IT8716F, IT8718F, IT8720F, IT8726F, IT8728F, IT8772F and SiS SiS950 hardware monitors and [watchdog(4)](/watchdog/4.md) timer to be used with the [sysctl(8)](/sysctl/8.md) interface.

Most supported devices possess 17 sensors:

| | | |
| --- | --- | --- |
| **Sensor** | **Units** | **Typical Use** |
| temp0 | uK | CPU Temperature |
| temp1 | uK | Motherboard Temperature |
| temp2 | uK | Unused |
| fan0 | RPM | CPU Fan |
| fan1 | RPM | Chassis Fan |
| fan2 | RPM | Power Fan |
| fan3 | RPM | Unused |
| fan4 | RPM | Unused |
| volt0 | uV DC | Core voltage |
| volt1 | uV DC | Core voltage |
| volt2 | uV DC | +3.3V |
| volt3 | uV DC | +5V |
| volt4 | uV DC | +12V |
| volt5 | uV DC | -12V |
| volt6 | uV DC | -5V |
| volt7 | uV DC | +5VSB |
| volt8 | uV DC | VBAT |

## SEE ALSO

[isa(4)](/isa/4.md), [watchdog(4)](/watchdog/4.md), [sensorsd(8)](/sensorsd/8.md), [sysctl(8)](/sysctl/8.md), [watchdogd(8)](/watchdogd/8.md)

## HISTORY

The **it** driver first appeared in OpenBSD 3.4.

## AUTHORS

The **it** driver was originally written for OpenBSD 3.4 by Julien Bordet ⟨*zejames@greyhats.org*⟩, and completely rewritten for OpenBSD 4.3 by Oleg Safiullin ⟨*form@pdp-11.org.ru*⟩.

## BUGS

Watchdog timer functionality is not supported for ITE IT8705 or SiS SiS950 chips. For older IT8712 chips, watchdog timeout values of more than 255 seconds are rounded up to the nearest minute.