DS28EA00 − 1-Wire Digital Thermometer with Sequence Detect and PIO
Thermometer, PIO and Chain.
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read-only,yes-no
Is the chip powered externally (=1) or from the
parasitically from the data bus (=0)?
read-only,
floating point
Measured temperature with 12 bit resolution.
read-only,
floating point
Measured temperature at 9 to 12 bit resolution. There is a
tradeoff of time versus accuracy in the temperature
measurement.
read-only,
floating point
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
/simultaneous/temperature.
read-only,
floating point
Equivalent to temperature9
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.
read-only,
yes-no
Set (intended) va;ue of the PIO pins.
read-only,
yes-no
Actual logical level at the PIO pins.
read-only,yes-no
Is the chip powered externally (=1) or from the
parasitically from the data bus (=0)?
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.
http://pdfserv.maxim-ic.com/en/ds/DS28EA00.pdf
http://www.owfs.org
Paul Alfille ([email protected])