Apparatus and method of calibrating a keyless transmitter
First Claim
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1. A crystal-less remote keyless entry system, comprising:
- a microprocessor;
a radio frequency circuit electrically coupled to the microprocessor;
a timing circuit electrically coupled to the microprocessor, the timing circuit being a unitary part of the microprocessor; and
a memory electrically coupled to the microprocessor, the memory being programmed with a compensation that adjusts an output frequency of the timing circuit such that the output frequency of the timing circuit does not coincide with a frequency discontinuity that occurs within an output of the timing circuit.
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Abstract
A crystal-less keyless entry system includes a micro controller, a timing circuit, a memory, and a radio frequency circuit. The memory and timing circuit are a unitary part of the microprocessor. The memory is programmed with a compensation that adjusts an output frequency of the timing circuit such that the output frequency of the timing circuit does not coincide with a frequency discontinuity that occurs within an output of the timing circuit. A method of calibrating the crystal-less keyless entry system includes programming the temperature compensation and a voltage compensation in the memory.
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Citations
16 Claims
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1. A crystal-less remote keyless entry system, comprising:
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a microprocessor;
a radio frequency circuit electrically coupled to the microprocessor;
a timing circuit electrically coupled to the microprocessor, the timing circuit being a unitary part of the microprocessor; and
a memory electrically coupled to the microprocessor, the memory being programmed with a compensation that adjusts an output frequency of the timing circuit such that the output frequency of the timing circuit does not coincide with a frequency discontinuity that occurs within an output of the timing circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A crystal-less remote keyless entry system, comprising:
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a microprocessor;
a radio frequency circuit electrically coupled to the microprocessor;
a timing circuit electrically coupled to the microprocessor, the timing circuit being a unitary part of the microprocessor;
a memory electrically coupled to the microprocessor, the memory being programmed with an oscillator calibration factor that adjusts an output frequency of the timing circuit; and
a test fixture electrically coupled to the microprocessor, the test fixture being configured to program the memory with a frequency compensation that ensures an output frequency of the timing circuit does not coincide with a frequency discontinuity within an output of the timing circuit. - View Dependent Claims (8)
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9. A method of calibrating a crystal-less remote keyless entry system, comprising:
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coupling a transmitter to a test fixture, the transmitter comprising a microprocessor which is a unitary part of a timing circuit and a memory, the microprocessor being electrically coupled to a radio frequency circuit;
programming the memory with a factor that compensates for a discontinuity in an output clock frequency of the timing circuit; and
validating the output frequency of the timing circuit through a range of operating voltages of the transmitter. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of calibrating a crystal-less remote keyless entry system, comprising:
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coupling a transmitter to a test fixture, the transmitter comprising a micro-controller in which a timing circuit and a memory are a unitary part of the micro-controller, the micro-controller being electrically coupled to a radio frequency circuit;
programming the memory with a K-factor that compensates for discontinuities in output frequencies of the timing circuit; and
validating the output frequency of the timing circuit through a range of operating voltages and operating frequencies of the transmitter. - View Dependent Claims (16)
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Specification