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DS18B20.man
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DS18B20.man
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'\"
'\" Copyright (c) 2003-2004 Paul H Alfille, MD
'\" (paul.alfille@gmail.com)
'\"
'\" Device manual page for the OWFS -- 1-wire filesystem package
'\" Based on Dallas Semiconductor, Inc's datasheets, and trial and error.
'\"
'\" Free for all use. No waranty. None. Use at your own risk.
'\" $Id$
'\"
.TH DS18B20 3 2003 "OWFS Manpage" "One-Wire File System"
.SH NAME
.TP
.B DS18B20
\- Programmable Resolution 1-Wire Digital Thermometer
.TP
.B MAX31820
\- Ambient Temperature Sensor
.SH SYNOPSIS
Thermometer.
.PP
.B 28
[.]XXXXXXXXXXXX[XX][/[
.so man3/temperatures_mini.3so
|
.B latesttemp
|
.B die
|
.B power
|
.B temphigh
|
.B templow
|
.B errata/die
|
.B errata/trim
|
.B errata/trimblanket
|
.B errata/trimvalid
|
.so man3/standard_mini.3so
]]
.SH FAMILY CODE
.PP
.I 28
.SH SPECIAL PROPERTIES
.SS power
.I read-only,yes-no
.br
Is the chip powered externally (=1) or from the parasitically from the data bus (=0)?
.SS temperature
.I read-only, floating point
.br
Measured temperature with 12 bit resolution.
.SS temperature9 temperature10 temperature11 temperature12
.I read-only, floating point
.br
Measured temperature at 9 to 12 bit resolution. There is a tradeoff of time versus accuracy in the temperature measurement.
.SS latesttemp
.I read-only, floating point
.br
Measured temperature at 9 to 12 bit resolution, depending on the resolution of the latest conversion on this chip. Reading this node will never trigger a temperature conversion. Intended for use in conjunction with
.B /simultaneous/temperature.
.SS fasttemp
.I read-only, floating point
.br
Equivalent to
.I temperature9
.so man3/temperature_threshold.3so
.so man3/temperature_errata.3so
.SH STANDARD PROPERTIES
.so man3/standard.3so
.SH DESCRIPTION
.so man3/description.3so
.SS DS18B20
The
.B DS18B20 (3)
is one of several available 1-wire temperature sensors. It is the replacement for the
.B DS18S20 (3)
Alternatives are
.B DS1822 (3)
as well as temperature/voltage measurements in the
.B DS2436 (3)
and
.B DS2438 (3).
For truly versatile temperature measurements, see the protean
.B DS1921 (3) Thermachron (3).
.P
The
.B MAX31820
is functionally identical to the
.B DS18B20
except for it's voltage requirements.
.br
The
.B DS18B20 (3)
can select between 4 resolutions. In general, high resolution is the best choice unless your application is truly time-constrained.
.SH ADDRESSING
.so man3/addressing.3so
.SH DATASHEET
.br
http://pdfserv.maxim-ic.com/en/ds/DS18B20.pdf
.SH SEE ALSO
.so man3/seealso.3so
.SH AVAILABILITY
http://www.owfs.org
.SH AUTHOR
Paul Alfille (paul.alfille@gmail.com)