Power-down circuit

G - Physics – 06 – F

Patent

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Details

G06F 1/30 (2006.01) G06F 1/24 (2006.01)

Patent

CA 2243895

A power-down circuit includes a power-on reset circuit that determines whether the supplied power falls below a prescribed level and, in response, outputs a reset signal for at least a prescribed period of time. A power supply latching circuit is responsive to the power-on reset circuit for switching on a power supply switching circuit to supply power from a power supply when the reset signal is not output. A power-down shutdown circuit, preferably under software control, and a power cutoff circuit, may be coupled to the power supply latching circuit, or alternatively the power-on reset circuit, for shutting down the power supplied from the power supply.

Circuit de mise hors tension comprenant un circuit de rétablissement de tension qui détermine si la tension d'alimentation tombe au-dessous d'un niveau préétabli et, le cas échéant, génère un signal de rétablissement pour au moins une période déterminée. Un circuit de verrouillage de la tension d'alimentation réagit au circuit de rétablissement de tension pour actionner un circuit de commutation de tension d'alimentation servant à fournir une tension provenant d'une source d'alimentation quelconque lorsque le signal de rétablissement n'est pas généré. Un circuit d'arrêt du circuit de mise hors tension, de préférence piloté par un logiciel, et un circuit de coupure de courant peuvent être accouplés au circuit de verrouillage de la tension d'alimentation ou, facultativement, au circuit de rétablissement de tension afin de couper le courant fourni par la source d'alimentation.

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