Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Reexamination Certificate
2008-08-15
2010-11-02
Lieu, Juli (Department: 2612)
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
C340S447000, C340S442000, C340S870030, C340S870030, C331S00100A, C073S146400, C073S146500, C375S354000, C375S355000, C375S303000, C375S308000, C375S311000
Reexamination Certificate
active
07825781
ABSTRACT:
A tire pressure monitoring system is capable of ensuring accuracy of the rate of transmission of data via wireless communications without an increase in the number of oscillators and an increase in the cost. The tire pressure monitoring system includes a tire pressure measuring module. The tire pressure measuring module has a microcomputer, an activation control circuit, a pressure sensor, a temperature sensor, a frequency divider, a transmitting circuit, and a battery. The microcomputer has a clock pulse generator, analog-to-digital converter circuits and a controller. The transmitting circuit has an oscillator circuit. The frequency divider divides the frequency of a carrier wave CW output from the oscillator circuit to generate a clock signal, and outputs the clock signal to the controller included in the microcomputer. The clock signal is used for the timing for outputting data to a data signal line DL. The clock signal for high precision data transmission can be generated without the need to provide an expensive oscillator in the microcomputer since the oscillator circuit is used in the transmitting circuit, and the clock signal used for data transmission by the microcomputer is generated by the inexpensive frequency divider.
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Crowell & Moring LLP
Hitachi , Ltd.
Lieu Juli
LandOfFree
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