Communication device with a self-calibrating sleep timer

摘要: The present invention provides for a system operating communication device (20) reception of scheduled intermittent information messages (22) with dual mode timer (70) that extends battery life. A controller (50) schedules the to power down all idle components between message receptions in saving sleep conserve power. During active when is fully messages, uses reference oscillator (90) relatively high frequency support digital processing by receiver (26). only powered on, much lower (96) used maintain lowest possible level consumption within itself. has provision automatic temperature calibration compensate timing inaccuracies inherent low-power low-frequency crystal mode. resultant improvement accuracy during eliminates need an initial reacquisition period following wake up mode, thereby reducing drain as well.