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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][/[

       See the file man3/temperatures_mini.3so.

       die | power | temphigh | templow | PIO.A|B|ALL.BYTE |
       latch.A|B|ALL.BYTE | sensed.A|B|ALL.BYTE

       See the file man3/standard_mini.3so.

       ]]


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
       resolution. 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
       eletrical 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)?

       See the file man3/temperature_threshold.3so.


STANDARD PROPERTIES

       See the file man3/standard.3so.


DESCRIPTION

       See the file man3/description.3so.

   DS28EA00
       The DS28EA00 (3) is one of several available 1-wire temperature
       sensors. 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 protean 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

       See the file man3/addressing.3so.


DATASHEET

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


SEE ALSO

       See the file man3/seealso.3so.


AVAILABILITY

       http://www.owfs.org


AUTHOR

       Paul Alfille (paul.alfille@gmail.com)

OWFS Manpage                         2003                          DS28EA00(3)

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