Remote keyless entry circuit having transient pulse suppression
First Claim
1. A remote keyless entry system, comprising:
- a microcontroller that is controllable by control software and operable in a default sleep mode;
a receiver that is turned on during a transient period and a data monitoring period by the control software; and
a control module that includes a data line that is configurable by the control software between a low state and an input capture state, the control module having a pulse blocker that blocks a stabilization pulse generated by the receiver during the transient period.
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Accused Products
Abstract
A remote keyless entry (RKE) circuit (100) and method reduces the amount of current draw by duty cycling the RKE circuit (100) to ensure that a microcontroller (104) in the RKE circuit (100) is awakened only when needed to evaluate RF data. A total operating period for the RKE circuit (100) includes a transient period, a data monitoring period, and a sleep period. The RKE circuit (100) includes a pulse blocking circuit (109) that prevents a receiver stabilization pulse from waking up the microcontroller (104). If no data is received during the data monitoring period, the microcontroller (104) remains in a sleep mode for the remainder of the operating period.
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Citations
17 Claims
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1. A remote keyless entry system, comprising:
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a microcontroller that is controllable by control software and operable in a default sleep mode;
a receiver that is turned on during a transient period and a data monitoring period by the control software; and
a control module that includes a data line that is configurable by the control software between a low state and an input capture state, the control module having a pulse blocker that blocks a stabilization pulse generated by the receiver during the transient period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A control module for a remote keyless entry system, the control module acting as an interface between a receiver and a microcontroller that operates in a default sleep mode, comprising:
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a data line that is configurable by control software between a low state and an input capture state;
a receiver status line that is configurable by the control software and that reflects whether the receiver is turned on or off, wherein the receiver status line indicates that the receiver is turned on during a transient period and a data monitoring period and turned off during a sleep period by the control software; and
a control module that includes a data line that is configurable by the control software between a low state and an input capture state, the control module having a pulse blocker that blocks a stabilization pulse generated by the receiver during the transient period, wherein the control software holds the data line at the low state during the transient period to cause the pulse blocker to block the stabilization pulse. - View Dependent Claims (10, 11, 12, 13)
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14. A method of controlling a remote keyless entry system having a receiver, a control module with a data line that is configurable between a low state and an input capture state, and a microcontroller that operates in a default sleep mode, the method comprising:
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operating in a transient period where the receiver is turned on and the data line is configured to the low state to block a stabilization pulse from the receiver from waking the microcontroller;
operating in a data monitoring period where the receiver is turned on and the data line is configured to the input capture state, wherein the control module wakes the microcontroller when data is received by the receiver; and
operating in a sleep period where the receiver is turned off. - View Dependent Claims (15, 16, 17)
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Specification