Patent ID: 6735183
Filing Date: 2004-05-11
Classification: G06K,H01Q,H03L

Abstract:
A radio frequency device comprising an integrated circuit including a microprocessor, a receiver configured to receive radio frequency commands from an interrogation device and having an output coupled to the microprocessor, the receiver including an amplifier powered by a selectively engageable voltage source, and a wake-up timer circuit coupled to the receiver and configured to determine when a signal received by the receiver is a radio frequency command from the interrogation device, the integrated circuit at times switching between a sleep mode and a receiver on mode, more power being consumed in the receiver on mode than in the sleep mode, the integrated circuit being configured to switch from the receiver on mode to a microprocessor on mode in response to the wake-up timer circuit determining that the signal received by the receiver is a radio frequency command from the interrogation device, more power being consumed in the microprocessor on mode than in the receiver on mode.