1.\" $NetBSD: admtemp.4,v 1.6 2016/01/03 21:58:17 jdc Exp $ 2.\" 3.\" $OpenBSD: admtemp.4,v 1.8 2007/05/31 19:19:48 jmc Exp $ 4.\" 5.\" Copyright (c) 2005 Theo de Raadt <deraadt@openbsd.org> 6.\" 7.\" Permission to use, copy, modify, and distribute this software for any 8.\" purpose with or without fee is hereby granted, provided that the above 9.\" copyright notice and this permission notice appear in all copies. 10.\" 11.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18.\" 19.Dd December 31, 2015 20.Dt ADMTEMP 4 21.Os 22.Sh NAME 23.Nm admtemp 24.Nd Analog Devices ADM1021 temperature sensor 25.Sh SYNOPSIS 26.Cd "admtemp* at iic? addr 0x18" 27.Sh DESCRIPTION 28The 29.Nm 30driver provides support for the Analog Devices ADM1021, 31Analog Devices ADM1023, Analog Devices ADM1032, Genesys Logic GL523SM, 32Global Mixed-mode Technology G781, Texas Instruments LM84, Maxim 1617, 33Maxim 1617A, Philips Semiconductors NE1617A, and Xeon embedded temperature 34sensors. 35The device possesses internal and external temperature sensors, and 36programmable low and high temperature limits, with a temperature range of 37-65 to +127 degC and a resolution of 1 degC. 38.Pp 39On i386 machines, this driver also supports the Xeon embedded 40I2C temperature probes. 41In this case, however, only one temperature value is provided. 42.Pp 43Exceeding the temperature limits causes the device to assert an Alarm signal, 44which can be used by other hardware to detect critical conditions. 45.Pp 46Some sensors differ from the ADM1021, MAX1617 and NE1617A: 47.Bl -item -offset indent 48.It 49The ADM1021A, ADM1023, ADM1032, and G781 have a temperature range of 0 to 50+127 degC and a resolution of 1 degC. 51.It 52The LM84 has no low temperature limits. 53.It 54The ADM1023, ADM1032, and G781 have extended precision remote temperature 55sensors, with a range of 0 to +127.875 degC and a resolution of 0.125 degC. 56.It 57The ADM1032 and G781 have additional high temperature limits with a range of 580 to +127 degC and a resolution of 1 degC. 59If these are exceeded, a separate Therm signal is asserted. 60.El 61.Pp 62The sensor and limit values are made available through the 63.Xr envstat 8 64interface. 65For devices without additional high temperature limits, the limits that are 66displayed and set are the critical limits. 67For devices with additional high temperature limits, high and low temperature 68warning limits and high temperature critical limits are displayed and can be 69set. 70.Sh SEE ALSO 71.Xr iic 4 , 72.Xr intro 4 , 73.Xr envstat 8 74.Sh AUTHORS 75.An -nosplit 76The 77.Nm 78driver was written by 79.An Theo de Raadt Aq Mt deraadt@openbsd.org . 80Extended precision temperatures, and limit display and setting were added by 81.An Julian Coleman Aq Mt jdc@NetBSD.org . 82.Sh BUGS 83Limit sensors occasionally read as 0xff. 84If this occurs, the 85.Nm 86driver will ignore that limit. 87