| 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.
| latesttemp | die | power | temphigh | templow | tempres | 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.
latesttemp
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.
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.
See the file man3/temperature_resolution.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)
| 2003 | OWFS Manpage |