An economical and commercially available quartz temperature sensor, Y1 and IC1, an LTC-485 RS485 transceiver in transmitter mode, form a Pierce crystal oscillator. The sensor, an Epson HTS-206, presents a nominal frequency of 40 kHz at 25°C and a temperature coefficient of –29.6/ppm/°C (Reference 3). The transceiver’s differential-line-driver outputs deliver a frequency-coded temperature signal over a twisted-pair cable at distances as far as 1000 ft.
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This entry was posted on Tuesday, June 17th, 2008 at 1:23 pm and is filed under Electronic Control.
