Programmable selective wake-up for radio frequency transponder
First Claim
1. A method for waking up a remote keyless entry (RKE) transponder for further processing of incoming data on a signal, said method comprising the steps of:
- receiving a signal with an analog front-end (AFE) of a remote keyless entry (RKE) transponder;
determining after a settling time period whether the received signal is off for a short gap time and if the short gap time occurs within a fixed time period;
if not, do not wake up the RKE transponder, and if so, then determining whether the received signal is on for a predefined high time period (TWAKH); and
determining after the predefined high time period (TWAKH) whether the received signal is off for a predefined low time period (TWAKL);
if not, do not wake up the RKE transponder, and if so, then waking up the RKE transponder for further processing of data from the received signal.
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Accused Products
Abstract
A remote keyless entry (RKE) transponder has a programmable selective wake-up filter for determining whether the RKE transponder should wake-up to process a received signal. The wake-up filter correlates the timing of an input signal'"'"'s carrier amplitude on and off time periods to a predefined programmable time period profile for a desired signal which has a certain carrier on time (time period on) and a certain carrier off time (time period off) arranged into a coded “header.” When a received signal matches the predefined time period profile, then the RKE transponder will wake-up to process the incoming signal data. The predefined time period profile may be programmable and may be stored in a header configuration register. Each RKE transponder has unique predefined time period on and time period off profiles.
41 Citations
25 Claims
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1. A method for waking up a remote keyless entry (RKE) transponder for further processing of incoming data on a signal, said method comprising the steps of:
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receiving a signal with an analog front-end (AFE) of a remote keyless entry (RKE) transponder;
determining after a settling time period whether the received signal is off for a short gap time and if the short gap time occurs within a fixed time period;
if not, do not wake up the RKE transponder, and if so, then determining whether the received signal is on for a predefined high time period (T WAK H); and
determining after the predefined high time period (T WAK H) whether the received signal is off for a predefined low time period (TWAK L);
if not, do not wake up the RKE transponder, and if so, then waking up the RKE transponder for further processing of data from the received signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A remote keyless entry (RKE) transponder having selective wake-up, comprising:
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a remote keyless entry (RKE) transponder having an analog front-end (AFE) for receiving a signal; and
a wake-up filter that determines, after a settling time period of the received signal and a short gap time that the signal is off, whether on and off times of the received signal substantially match a predefined high time period (T WAK H) and a predefined low time period (TWAK L), respectively, and if so waking up the RKE transponder for further processing of data from the received signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification