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The 1-Wire Thermocouple
http://www.sensorsmag.com/sensors/electric-magnetic/the-1-wire-thermocouple-1086
A standard thermocouple can be combined with a lithium ion monitor chip to create a smart sensor that communicates with a PC or microcontroller over a single twisted-pair cable.
**broken link removed**
**broken link removed**
The chip can directly digitize the millivolt level output produced between the hot and cold junctions, while its onchip temperature sensor continuously monitors the temperature at the cold junction. The unique ID address provides a label that permits multiple units to operate on the same twisted-pair cable.
A complete signal conditioning and digitizing solution for use with a thermocouple, the DS2760 contains a 10-bit voltage ADC input, a 13-bit temperature ADC, and a 12-bit plus-sign current ADC. It also provides 32 bytes of lockable EEPROM memory where pertinent user or sensor documentation may be stored, minimizing the probability of error due to sensor mislabeling.
**broken link removed**
In the circuit, C1 and one of the Schottky diodes in CR1 form a half-wave rectifier that provides power for the DS2760 by "stealing" it from the bus during idle communication periods when the bus is at 5 V. This is a discrete implementation of the parasite power technique used internally by 1-Wire devices to provide their own operating power. The remaining Schottky diode in the package is connected across DATA and GND and provides circuit protection by restricting signal excursions that go below ground to about –0.4 V.
http://datasheets.maximintegrated.com/en/ds/DS2760.pdf
Also check this link:
http://owfs.sourceforge.net/thermocouples.html
http://www.sensorsmag.com/sensors/electric-magnetic/the-1-wire-thermocouple-1086
A standard thermocouple can be combined with a lithium ion monitor chip to create a smart sensor that communicates with a PC or microcontroller over a single twisted-pair cable.
**broken link removed**
**broken link removed**
The chip can directly digitize the millivolt level output produced between the hot and cold junctions, while its onchip temperature sensor continuously monitors the temperature at the cold junction. The unique ID address provides a label that permits multiple units to operate on the same twisted-pair cable.
A complete signal conditioning and digitizing solution for use with a thermocouple, the DS2760 contains a 10-bit voltage ADC input, a 13-bit temperature ADC, and a 12-bit plus-sign current ADC. It also provides 32 bytes of lockable EEPROM memory where pertinent user or sensor documentation may be stored, minimizing the probability of error due to sensor mislabeling.
**broken link removed**
In the circuit, C1 and one of the Schottky diodes in CR1 form a half-wave rectifier that provides power for the DS2760 by "stealing" it from the bus during idle communication periods when the bus is at 5 V. This is a discrete implementation of the parasite power technique used internally by 1-Wire devices to provide their own operating power. The remaining Schottky diode in the package is connected across DATA and GND and provides circuit protection by restricting signal excursions that go below ground to about –0.4 V.
http://datasheets.maximintegrated.com/en/ds/DS2760.pdf
Also check this link:
http://owfs.sourceforge.net/thermocouples.html
