ADMTEMP(4) | Device Drivers Manual | ADMTEMP(4) |
admtemp
— Analog
Devices ADM1021 temperature sensor
admtemp* at iic? addr 0x18
The admtemp
driver provides support for
the Analog Devices ADM1021, Analog 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 temperature sensors. The device possesses internal and external
temperature sensors, and programmable low and high temperature limits, with
a temperature range of -65 to +127 degC and a resolution of 1 degC.
On i386 machines, this driver also supports the Xeon embedded I2C temperature probes. In this case, however, only one temperature value is provided.
Exceeding the temperature limits causes the device to assert an Alarm signal, which can be used by other hardware to detect critical conditions.
Some sensors differ from the ADM1021, MAX1617 and NE1617A:
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.
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>.
Limit sensors occasionally read as 0xff. If this occurs, the
admtemp
driver will ignore that limit.
December 31, 2015 | NetBSD 10.99 |