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+.\" $NetBSD: tm121temp.4,v 1.6 2007/12/02 19:09:16 wiz Exp $
+.\"
+.\" Copyright (c) 2006 Garrett D'Amore
+.\" All rights reserved.
+.\"
+.\" Written by Garrett D'Amore.
+.\"
+.\" 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. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\" 3. The name of the author may not be used to endorse
+.\" or promote products derived from this software without specific
+.\" prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 October 9, 2006
+.Dt TM121TEMP 4
+.Os
+.Sh NAME
+.Nm tm121temp
+.Nd Texas Instruments TMP121 temperature sensor
+.Sh SYNOPSIS
+.Cd "tm121temp0 at spi? slave 0"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the
+.Tn Texas Instruments
+(formerly
+.Tn Burr-Brown )
+TMP121 temperature sensor
+with the
+.Xr envsys 4
+API.
+These devices are connected to the host system with
+.Xr spi 4
+or
+.Tn Microwire
+4-wire serial busses.
+The
+.Nm
+is capable of measuring temperatures with a 2 degree accuracy
+over the frame from -40 to 125 Celsius.
+Temperatures are reported with a
+granularity of 625 microKelvins.
+.Pp
+.Nm
+devices can transfer information at up to 10MHz, and support
+SPI mode 0.
+.Pp
+The device reports itself with
+.Xr envsys 4
+using the generic device name.
+This name can be overridden, by specifying an alternate name in the device
+property
+.Dq envsys-description .
+.Sh SEE ALSO
+.Xr envsys 4 ,
+.Xr spi 4 ,
+.Xr envstat 8
+.Sh HISTORY
+The
+.Nm
+driver was written by
+.An Garrett D'Amore
+and first appeared in
+.Nx 4.0 .