Patent ID: 8164416

Claim:
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: a) detecting a low frequency signal with an analog front-end (AFE) of a remote keyless entry (RKE) transponder; b) determining if the low frequency signal is being detected for at least a stabilization time period (Tstab), if so then continuing to step c), if not then waiting a time-out time period and thereafter returning to step a); c) determining if the low frequency signal is not being detected for a gap time period (Tgap), if so then continuing to step d), if not then waiting the time-out time period and thereafter returning to step a); d) determining if the low frequency signal is being detected for at least a high time period (TwakH), if so then continuing to step e) and if not then returning to step a); e) determining if the low frequency signal is not being detected for at least a low time period (TwakL), if so then continuing to step f) and if not then returning to step a) wherein the low time period (TwakL) and the high time period (TwakH) are set by programming a configuration register f) determining if the detection of the low frequency signal in step d) and no detection of the low frequency signal in step e) occur within a total time period (T WAK T), if so then continuing to step g) and if not then returning to step a); g) waking up logic circuits of the RKE transponder for processing of data from the low frequency signal and after processing of the data then returning to step a), wherein the data is transmitted using amplitude modulation of the low frequency signal and the data is transmitted after step e).