Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1998-05-18
2000-03-07
Bennett, G. Bradley
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
G01K 725
Patent
active
060331097
ABSTRACT:
A device appropriate for converting voltages to temperature values by using a thermistor is disclosed. The device according to the present invention utilizes a voltage-temperature cross-reference table and a temperature-increment table to carry out the conversion instead of using the conventional one-to-one voltage-temperature table, thereby reducing the required capacity of RAM and ROM and the fabrication cost. The thermistor is disposed at the place where the temperature is to be measured, and the voltage across the thermistor varies with respect to changes of temperature. An analog-to-digital converter receives the voltage of the thermistor and transforms it into digital output. A first multiplexer decodes the higher bit portion of the digital output thereby selecting a corresponding temperature from a voltage-temperature cross-reference table as a rough temperature. A second multiplexer decodes the higher bit portion of the digital output thereby selecting a corresponding temperature increment from a temperature-increment table as a temperature step. A multiplier multiplies the lower bit portion of the digit output by the temperature step to obtain a fine temperature. An adder adds the fine temperature to the rough temperature to output a practical temperature value.
REFERENCES:
DiRocco et al., "Mate low-level thermocouples to uCs easily with a flying capacitor multiplexer," Electronic Design, vol. 28, No. 6 (Mar. 1980), pp. 283-285.
Bennett G. Bradley
Pruchnic Jr. Stanley J.
Winbond Electronics Corp.
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