2007-12-02 22:09:16 +03:00
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.\" $NetBSD: tm121temp.4,v 1.6 2007/12/02 19:09:16 wiz Exp $
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2006-10-09 20:51:51 +04:00
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.\"
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.\" Copyright (c) 2006 Garrett D'Amore
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.\" All rights reserved.
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.\"
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.\" Written by Garrett D'Amore.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse
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.\" or promote products derived from this software without specific
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.\" prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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.\" OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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.\" GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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.\" NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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.\" SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd October 9, 2006
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.Dt TM121TEMP 4
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.Os
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.Sh NAME
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.Nm tm121temp
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.Nd Texas Instruments TMP121 temperature sensor
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.Sh SYNOPSIS
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.Cd "tm121temp0 at spi? slave 0"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the
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.Tn Texas Instruments
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(formerly
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.Tn Burr-Brown )
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TMP121 temperature sensor
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with the
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.Xr envsys 4
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API.
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These devices are connected to the host system with
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.Xr spi 4
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or
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.Tn Microwire
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4-wire serial busses.
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The
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.Nm
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is capable of measuring temperatures with a 2 degree accuracy
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2006-10-14 01:19:08 +04:00
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over the frame from -40 to 125 Celsius.
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Temperatures are reported with a
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2006-10-09 20:51:51 +04:00
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granularity of 625 microKelvins.
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.Pp
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.Nm
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2006-10-14 01:15:19 +04:00
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devices can transfer information at up to 10MHz, and support
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2006-10-09 20:51:51 +04:00
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SPI mode 0.
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.Pp
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The device reports itself with
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.Xr envsys 4
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2006-10-14 11:53:38 +04:00
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using the generic device name.
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2006-10-09 20:51:51 +04:00
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This name can be overridden, by specifying an alternate name in the device
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property
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2007-12-02 22:09:16 +03:00
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.Dq envsys-description .
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2006-10-09 20:51:51 +04:00
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.Sh SEE ALSO
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.Xr envsys 4 ,
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2006-10-14 01:19:08 +04:00
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.Xr spi 4 ,
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.Xr envstat 8
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2006-10-09 20:51:51 +04:00
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.Sh HISTORY
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The
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.Nm
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driver was written by
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.An Garrett D'Amore
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and first appeared in
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.Nx 4.0 .
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