DS18B20
− Programmable Resolution 1-Wire Digital Thermometer
MAX31820
− Ambient Temperature Sensor
Thermometer.
28 [.]XXXXXXXXXXXX[XX][/[ | latesttemp | die | power | temphigh | templow | tempres | errata/die | errata/trim | errata/trimblanket | errata/trimvalid | ]]
28
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
The DS18B20 (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/voltage measurements in the DS2436 (3) and DS2438 (3). For truly versatile temperature measurements, see the protean DS1921 (3) Thermachron (3).
The
MAX31820 is functionally identical to the
DS18B20 except for it’s voltage requirements.
The DS18B20 (3) can select between 4 resolutions. In
general, high resolution is the best choice unless your
application is truly time-constrained.
http://pdfserv.maxim-ic.com/en/ds/DS18B20.pdf
http://www.owfs.org
Paul Alfille ([email protected])