Resistance-to-digital converter
First Claim
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1. A resistance-to-digital converter comprising:
- an oscillator that is connected to a target resistor whose resistance is to be subjected to digital conversion, and that oscillates at an oscillation frequency corresponding to the resistance of the target resistor;
time period counting means for counting a clock signal to determine a predetermined time period; and
oscillation output counting means for counting an oscillation output of said oscillator during the predetermined time period, and for outputting its count value as a digital value corresponding to the resistance of the target resistor.
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Abstract
A resistance-to-digital converter includes a CR oscillator, a time period counter, and an oscillation output counter. The CR oscillator, being connected to a target resistor whose resistance is to be subjected to digital conversion, oscillates at an oscillation time constant including the resistance of the target resistor as a part of the time constant. The time period counter counts a clock signal and defines a predetermined time period. The oscillation output counter counts the oscillation output of the CR oscillator during the predetermined time period, and outputs the count value as the digital value corresponding to the resistance of the target resistor to be converted.
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Citations
14 Claims
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1. A resistance-to-digital converter comprising:
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an oscillator that is connected to a target resistor whose resistance is to be subjected to digital conversion, and that oscillates at an oscillation frequency corresponding to the resistance of the target resistor;
time period counting means for counting a clock signal to determine a predetermined time period; and
oscillation output counting means for counting an oscillation output of said oscillator during the predetermined time period, and for outputting its count value as a digital value corresponding to the resistance of the target resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification