admtemp(4) - NetBSD Manual Pages

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ADMTEMP(4)              NetBSD Kernel Interfaces Manual             ADMTEMP(4)


NAME

     admtemp -- Analog Devices ADM1021 temperature sensor


SYNOPSIS

     admtemp* at iic? addr 0x18


DESCRIPTION

     The admtemp driver provides support for the Analog Devices ADM1021, Ana-
     log Devices ADM1023, Analog Devices ADM1032, Genesys Logic GL523SM,
     Global Mixed-mode Technology G781, Texas Instruments LM84, Maxim 1617,
     Maxim 1617A, Philips Semiconductors NE1617A, and Xeon embedded tempera-
     ture sensors.  The device possesses internal and external temperature
     sensors, and programmable low and high temperature limits, with a temper-
     ature range of -65 to +127 degC and a resolution of 1 degC.

     On i386 machines, this driver also supports the Xeon embedded I2C temper-
     ature probes.  In this case, however, only one temperature value is pro-
     vided.

     Exceeding the temperature limits causes the device to assert an Alarm
     signal, which can be used by other hardware to detect critical condi-
     tions.

     Some sensors differ from the ADM1021, MAX1617 and NE1617A:

           The ADM1021A, ADM1023, ADM1032, and G781 have a temperature range
           of 0 to +127 degC and a resolution of 1 degC.

           The LM84 has no low temperature limits.

           The ADM1023, ADM1032, and G781 have extended precision remote tem-
           perature sensors, with a range of 0 to +127.875 degC and a resolu-
           tion of 0.125 degC.

           The ADM1032 and G781 have additional high temperature limits with a
           range of 0 to +127 degC and a resolution of 1 degC.  If these are
           exceeded, a separate Therm signal is asserted.

     The sensor and limit values are made available through the envstat(8)
     interface.  For devices without additional high temperature limits, the
     limits that are displayed and set are the critical limits.  For devices
     with additional high temperature limits, high and low temperature warning
     limits and high temperature critical limits are displayed and can be set.


SEE ALSO

     iic(4), intro(4), envstat(8)


AUTHORS

     The admtemp driver was written by Theo de Raadt <deraadt@openbsd.org>.
     Extended precision temperatures, and limit display and setting were added
     by Julian Coleman <jdc@NetBSD.org>.


BUGS

     Limit sensors occasionally read as 0xff.  If this occurs, the admtemp
     driver will ignore that limit.

NetBSD 8.0                     December 31, 2015                    NetBSD 8.0