Patent ID: 6144569
Filing Date: 2000-11-07
Classification: G06F,H04B

Abstract:
A system providing for restoration of operation of an electronic apparatus following disconnection and reconnection of a power supply coupled to the electronic apparatus, the system comprising:a terminal coupled to the electronic apparatus for receiving a voltage from the power supply;an internal reference supply circuit coupled to the terminal and capable of providing a voltage reference;a first level detecting circuit coupled to the terminal and capable of operating independently of the internal reference supply circuit for monitoring the voltage;a second level detecting circuit coupled to the terminal for monitoring the voltage;a power cut monitor and reference control circuit coupled to receive a first signal from the first level detecting circuit and a second signal from the second level detecting circuit and capable of causing the internal reference supply circuit to remain enabled in response to the first signal and the second signal indicating the voltage is lower than a first predetermined voltage level and greater than a second predetermined voltage level; andan under voltage monitor and recovery circuit coupled to receive a third signal from the second level detecting circuit and capable of causing the electronic apparatus to restart if the voltage monitored by the second level detecting circuit drops below the first predetermined voltage level and thereafter recovers and exceeds a level substantially equal to the first predetermined voltage level.