초록 ▼

A temperature-sensor is implemented with a temperature-sensitive component of an IC chip which functions as a radio frequency transponder capable of measuring parameters associated with an object and transmitting data to an external reader/interrogator. In use with a pneumatic tire, the transponder

A temperature-sensor is implemented with a temperature-sensitive component of an IC chip which functions as a radio frequency transponder capable of measuring parameters associated with an object and transmitting data to an external reader/interrogator. In use with a pneumatic tire, the transponder measures temperature and pressure within the tire. The transponder includes circuitry for controlling windows of time during which real-time temperature and pressure measurements are made, and for storing calibration data, transponder ID number and the like, and for transmitting this information in a data stream to the reader/interrogator. An excessive temperature condition may also be sensed and included in the data stream.

대표청구항 ▼

1. A method of measuring temperature utilizing an integrated circuit (IC) chip, the method comprising:flowing a current through a resistor (Rext), the resistance value of which is substantially independent of temperature, said current being a function of an absolute temperature of a transistor (Q1)

1. A method of measuring temperature utilizing an integrated circuit (IC) chip, the method comprising:flowing a current through a resistor (Rext), the resistance value of which is substantially independent of temperature, said current being a function of an absolute temperature of a transistor (Q1) resident on the IC chip, said transistor being of a type which exhibits a predictable change in its base-emitter voltage over a temperature range; mirroring the current flowing through the resistor to a circuit on the IC chip, said circuit providing an output signal which is proportional to the current flowing through the resistor, thereby making the output signal temperature-dependent as a function of the absolute temperature of the transistor; including at least one internal capacitor in the circuit and an external capacitor outside the circuit; and selectively switching the external capacitor across the at least one internal capacitor to alter a characteristic of the output signal.