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AMDTEMP(4)                   Device Drivers Manual                  AMDTEMP(4)

NAME
     amdtemp - AMD CPU on-die digital thermal sensor

SYNOPSIS
     amdtemp* at amdnb_miscbus?

DESCRIPTION
     The amdtemp driver provides support for the on-die digital thermal sensor
     present on AMD K8, AMD Barcelona, AMD Phenom, AMD Griffin, AMD Fusion,
     AMD Bobcat, and AMD Puma CPUs.

     These sensors were officially introduced in AMD K8 Revision F processors,
     and provide 0.5<deg>C accuracy.  Precision was improved in Revision G
     chips, which provide two more bits for 0.25<deg>C steppings.  Each core
     has two temperature sensors, and there are up to two cores per CPU
     socket.

     AMD Barcelona, AMD Phenom, AMD Griffin, AMD Fusion, AMD Bobcat, and AMD
     Puma provide 0.125<deg>gC accuracy and provide one temperature sensor for
     each CPU socket.

     The amdtemp driver reports temperatures through the envsys(4) API.

           Sensor          Units    Typical Use
           CPUN sensor0    ,uK       cpuN temperature

SEE ALSO
     envsys(4), envstat(8), powerd(8)

HISTORY
     The amdtemp driver first appeared in OpenBSD 4.4 named "kate".  It was
     then ported to NetBSD 5.0.  The driver has been renamed with support for
     newer AMD CPUs.

AUTHORS
     The amdtemp driver was written by Constantine A. Murenin
     <cnst@openbsd.org> whilst at the University of Waterloo.  It was adapted
     to NetBSD by Christoph Egger.

NetBSD 8.99.34                 January 28, 2018                 NetBSD 8.99.34