1.\" $NetBSD: lmtemp.4,v 1.4 2016/01/03 17:28:46 jdc Exp $ 2.\" 3.\" Copyright (c) 2005 KIYOHARA Takashi 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Neither the name of the author nor the names of any 12.\" contributors may be used to endorse or promote products derived 13.\" from this software without specific prior written permission. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS 16.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 17.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 19.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25.\" POSSIBILITY OF SUCH DAMAGE. 26.\" 27.Dd January 1, 2016 28.Dt LMTEMP 4 29.Os 30.Sh NAME 31.Nm lmtemp 32.Nd National Semiconductor LM75, LM77 and compatible hardware monitors 33.Sh SYNOPSIS 34.Cd "lmtemp0 at iic? addr 0x48 flags 0x0000" 35.Sh DESCRIPTION 36The 37.Nm 38driver provides support for the 39.Tn National Semiconductor 40LM on iicbus series temperature sensors and register compatible chips. 41.Pp 42Each device is specified by the value of the address and flags. 43.Bl -column "Device" "0x48 - 0x4f" "flags" -offset indent 44.It Sy "Device" Ta Sy "addr" Ta Sy "flags" 45.It Li "LM75" Ta "0x48 - 0x4f" Ta "0x0000" 46.It Li "LM75A" Ta "0x48 - 0x4f" Ta "0x0000" 47.It Li "DS75" Ta "0x48 - 0x4f" Ta "0x0001" 48.It Li "LM77" Ta "0x48 - 0x4b" Ta "0x0002" 49.El 50.Sh HARDWARE 51Chips supported by the 52.Nm 53driver include: 54.Bl -column "National Semiconductor LM75" "-55 \(en +125" "Resolution" \ 55-offset indent 56.It Sy "Device" Ta Sy "Range" Ta Sy "Resolution" 57.It Li "National Semiconductor LM75" Ta "-55 \(en +125" Ta "0.5 degC" 58.It Li "Texas Instruments LM75A" Ta "-55 \(en +125" Ta "0.5 degC" 59.It Li "Dallas Semiconductor DS75" Ta "-55 \(en +125" Ta "0.0625 degC" 60.It Li "National Semiconductor LM77" Ta "-55 \(en +130" Ta "0.5 degC" 61.El 62.Pp 63The LM75, LM75A, and DS75 have a programmable high temperature limit. 64When this is exceeded, the device asserts an over-temperature output. 65.Pp 66The LM77 has programmable low and high temperature limits. 67Exceeding either of these causes the device to assert an interrupt output. 68It also has a programmable critical high temperature limit, and 69exceeding this causes the device to assert a separate critical alarm 70output. 71.Pp 72The sensor and limit values are made available through the 73.Xr envstat 8 74interface. 75.Sh SEE ALSO 76.Xr envsys 4 , 77.Xr envstat 8 78.Sh HISTORY 79The 80.Nm 81device appeared in 82.Nx 4.0 . 83.Sh BUGS 84Interrupt support is unimplemented. 85