Radio frequency identification tag device with sensor input
First Claim
Patent Images
1. A radio frequency identification tag device having a sensor input, comprising:
- a radio frequency tuned circuit;
a logic circuit having a data register;
a radio frequency switch circuit for loading and unloading said radio frequency tuned circuit;
a sensor input circuit;
at least one dual function input, wherein said at least one dual function input is coupled to said sensor input circuit and said logic circuit so that the at least one dual function input may be used for programming or testing when in a first function and as another sensor input circuit when in a second function; and
a power converter circuit for converting radio frequency power into direct current power for powering said circuits of said radio frequency identification tag device;
wherein, said sensor input circuit being used to modify the data register contents, and said logic circuit using the data register contents to control said radio frequency switch circuit.
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Abstract
A radio frequency identification tag device having a sensor input which modifies a tag data word bitstream read by an interrogator/tag detector. The sensor input may be a switch contact(s), digital and/or analog. The sensor input may be voltage, current, pressure, temperature, resistance, acceleration, moisture, gas and the like. Power from the radio frequency interrogator/tag reader may be used to power the circuits of the radio frequency tag device, which in turn may supply power to any sensor connected thereto.
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Citations
30 Claims
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1. A radio frequency identification tag device having a sensor input, comprising:
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a radio frequency tuned circuit;
a logic circuit having a data register;
a radio frequency switch circuit for loading and unloading said radio frequency tuned circuit;
a sensor input circuit;
at least one dual function input, wherein said at least one dual function input is coupled to said sensor input circuit and said logic circuit so that the at least one dual function input may be used for programming or testing when in a first function and as another sensor input circuit when in a second function; and
a power converter circuit for converting radio frequency power into direct current power for powering said circuits of said radio frequency identification tag device;
wherein,said sensor input circuit being used to modify the data register contents, and said logic circuit using the data register contents to control said radio frequency switch circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A system for identifying and reading a sensor value, said system comprising:
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a radio frequency identification tag device having a sensor input, a radio frequency tuned circuit, a logic circuit having a data register, a radio frequency switch circuit for loading and unloading said radio frequency tuned circuit, at least one dual function input, wherein said at least one dual function input is coupled to said sensor input circuit and said logic circuit so that the at least one dual function input may be used for programming or testing when in a first function and as another sensor input circuit when in a second function; and
a power converter circuit for converting radio frequency power into direct current power for powering said circuits of said radio frequency identification tag device;
wherein, said sensor input circuit being used to modify the data register contents, and said logic circuit using the data register contents to control said radio frequency switch circuit;
a sensor for measuring a process value, said sensor connected to said at least one dual function input;
a radio frequency interrogator for generating radio frequency power at a frequency compatible with said tuned circuit; and
an identification tag reader connected to said radio frequency interrogator;
said identification tag reader detecting amplitude variations of the radio frequency power for determining the data register contents of said radio frequency tag device. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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Specification