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IT(4) Device Drivers Manual IT(4)

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

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

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

Most supported devices possess 17 sensors:

uK CPU Temperature
uK Motherboard Temperature
uK Unused
RPM Chassis Fan
RPM Power Fan
RPM Unused
RPM Unused
uV DC Core voltage
uV DC Core voltage
uV DC +3.3V
uV DC +5V
uV DC +12V
uV DC -12V
uV DC -5V

isa(4), watchdog(4), sensorsd(8), sysctl(8), watchdogd(8)

The it driver first appeared in OpenBSD 3.4.

The it driver was originally written for OpenBSD 3.4 by Julien Bordet <>, and completely rewritten for OpenBSD 4.3 by Oleg Safiullin <>.

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.

September 10, 2015 OpenBSD-6.8