adm1026hm(4) - NetBSD Manual Pages

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ADM1026HM(4)            NetBSD Kernel Interfaces Manual           ADM1026HM(4)


NAME

     adm1026hm -- Analog Devices ADM1026 complete thermal system management
     controller


SYNOPSIS

     adm1026hm* at iic? addr?


DESCRIPTION

     The adm1026hm driver provides support for the Analog Devices ADM1026
     hardware monitor.  The chip possesses 8 fan speed sensors, 3 temperature
     sensors, and 17 voltage sensors.  The number of each sensor type config-
     ured by the driver depends on the chip configuration.

     The values of the sensors are made available through the envstat(8)
     interface.

           Sensor          Units    Description
           fan N           RPM      Fan 0-7
           internal        C        Internal temperature
           external N      C        External temperature 1-2
           Vbatt           mV DC    Battery voltage
           V3.3 standby    mV DC    3.3V standby voltage
           V3.3 main       mV DC    3.3V main voltage
           V5.0            mV DC    5.0V supply voltage
           V+12            mV DC    +12V supply voltage
           V-12            mV DC    -12V supply voltage
           V3.3 N          mV DC    Analog in (3.3V reference) 0-5
           V2.5 N          mV DC    Analog in (2.5V reference) 0-3

     Configurable limits for the sensors are also available via envstat(8).
     Initial limit values are read from the chip.  Each temperature sensor has
     a high, therm and low limit, which are mapped to critmax, warnmax and
     warnmin, respectively.  Voltage sensors have high (warnmax) and low
     (warnmin) limits.  Fan sensors have a high limit mapped to warnmin,
     because the fan measurements are revolution intervals, so higher numbers
     correlate to lower fan speeds.


SEE ALSO

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


AUTHORS

     The adm1026hm driver was written by Julian Coleman <jcoleman@NetBSD.org>.


BUGS

     It's not possible to determine if either a sensor is not connected, or
     the monitored device is producing no output.  Therefore, unconnected sen-
     sors will show outputs of 0.

     The adm1026hm driver does not support interrupt output nor the built-in
     EEPROM.

NetBSD 11.99                   February 16, 2026                  NetBSD 11.99