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DS28EA00(3)		     One-Wire File System		   DS28EA00(3)

NAME
       DS28EA00 - 1-Wire Digital Thermometer with Sequence Detect and PIO

SYNOPSIS
       Thermometer, PIO and Chain.

       42   [.]XXXXXXXXXXXX[XX][/[   die  |  power  |  temphigh	 |  templow  |
       PIO.A|B|ALL.BYTE | latch.A|B|ALL.BYTE | sensed.A|B|ALL.BYTE

       ]]

FAMILY CODE
       42

SPECIAL PROPERTIES
   power
       read-only,yes-no
       Is the chip powered externally (=1) or from the parasitically from  the
       data bus (=0)?

TEMPERATURE PROPERTIES
   temperature
       read-only, floating point
       Measured temperature with 12 bit resolution.

   temperature9 temperature10 temperature11 temperature12
       read-only,  floating  point Measured temperature at 9 to 12 bit resolu‐
       tion. There is a tradeoff of time versus accuracy  in  the  temperature
       measurement.

   fasttemp
       read-only, floating point
       Equivalent to temperature9

PIO PROPERTIES
   PIO.A|B|ALL|BYTE
       read-write, yes-no
       Two channels of sensors/switches. We use the logical raqther than elet‐
       rical interpretation: 0=off (non-conducting)  1=on  (conducting	--  to
       ground)

       The PIO channels are alternatively used for the sequence-detect (chain)
       mode.

       Reading sensed gives the inverse value of the cooresponding PIO.

       Reading PIO gives the actual pin values. Use the latch property to  see
       how the pin is set.

   latch.A|B|ALL|BYTE
       read-only, yes-no
       Set (intended) va;ue of the PIO pins.

   sensed.A|B|ALL|BYTE
       read-only, yes-no
       Actual logical level at the PIO pins.

SPECIAL PROPERTIES
   power
       read-only,yes-no
       Is  the chip powered externally (=1) or from the parasitically from the
       data bus (=0)?

STANDARD PROPERTIES
DESCRIPTION
   DS28EA00
       The DS28EA00 (3) is one of several available  1-wire  temperature  sen‐
       sors. It is the replacement for the DS18S20 (3) Alternatives are DS1822
       (3) as well as temperature/vlotage measurements in the DS2436  (3)  and
       DS2438 (3).  For truly versatile temperature measurements, see the pro‐
       tean DS1921 (3) Thermachron (3).
       The DS28EA00 has special switch/sequence detect properties. In sequence
       mode, the PIO pins are daisy-chained to the next DS28EA00, allowing the
       system to step through the physical sequence of the DS28EA00s.

ADDRESSING
DATASHEET
       http://pdfserv.maxim-ic.com/en/ds/DS28EA00.pdf

SEE ALSO
AVAILABILITY
       http://www.owfs.org

AUTHOR
       Paul Alfille (paul.alfille@gmail.com)

OWFS Manpage			     2003			   DS28EA00(3)

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