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+.\"	$NetBSD: lmtemp.4,v 1.4 2016/01/03 17:28:46 jdc Exp $
+.\"
+.\" Copyright (c) 2005 KIYOHARA Takashi
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Neither the name of the author nor the names of any
+.\"    contributors may be used to endorse or promote products derived
+.\"    from this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd January 1, 2016
+.Dt LMTEMP 4
+.Os
+.Sh NAME
+.Nm lmtemp
+.Nd National Semiconductor LM75, LM77 and compatible hardware monitors
+.Sh SYNOPSIS
+.Cd "lmtemp0 at iic? addr 0x48 flags 0x0000"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the
+.Tn National Semiconductor
+LM on iicbus series temperature sensors and register compatible chips.
+.Pp
+Each device is specified by the value of the address and flags.
+.Bl -column "Device" "0x48 - 0x4f" "flags" -offset indent
+.It Sy "Device" Ta Sy "addr" Ta Sy "flags"
+.It Li "LM75" Ta "0x48 - 0x4f" Ta "0x0000"
+.It Li "LM75A" Ta "0x48 - 0x4f" Ta "0x0000"
+.It Li "DS75" Ta "0x48 - 0x4f" Ta "0x0001"
+.It Li "LM77" Ta "0x48 - 0x4b" Ta "0x0002"
+.El
+.Sh HARDWARE
+Chips supported by the
+.Nm
+driver include:
+.Bl -column "National Semiconductor LM75" "-55 \(en +125" "Resolution" \
+-offset indent
+.It Sy "Device" Ta Sy "Range" Ta Sy "Resolution"
+.It Li "National Semiconductor LM75" Ta "-55 \(en +125" Ta "0.5 degC"
+.It Li "Texas Instruments LM75A" Ta "-55 \(en +125" Ta "0.5 degC"
+.It Li "Dallas Semiconductor DS75" Ta "-55 \(en +125" Ta "0.0625 degC"
+.It Li "National Semiconductor LM77" Ta "-55 \(en +130" Ta "0.5 degC"
+.El
+.Pp
+The LM75, LM75A, and DS75 have a programmable high temperature limit.
+When this is exceeded, the device asserts an over-temperature output.
+.Pp
+The LM77 has programmable low and high temperature limits.
+Exceeding either of these causes the device to assert an interrupt output.
+It also has a programmable critical high temperature limit, and
+exceeding this causes the device to assert a separate critical alarm
+output.
+.Pp
+The sensor and limit values are made available through the
+.Xr envstat 8
+interface.
+.Sh SEE ALSO
+.Xr envsys 4 ,
+.Xr envstat 8
+.Sh HISTORY
+The
+.Nm
+device appeared in
+.Nx 4.0 .
+.Sh BUGS
+Interrupt support is unimplemented.