Chip for non-contact reader/writer having power-supply...

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage

Reexamination Certificate

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Details

C327S544000, C327S407000, C307S043000, C307S080000, C307S081000

Reexamination Certificate

active

07554383

ABSTRACT:
The present invention relates to a semiconductor integrated-circuit device capable of seamlessly switching a power source obtained by rectifying a carrier wave and an external power source. The semiconductor integrated-circuit device having a non-contact card function and a non-contact reader/writer function includes a rectifier131for rectifying a received carrier wave, a serial regulator132for obtaining a predetermined voltage from an output voltage of the rectifier131,and a power-supply control circuit138for turning on/off the voltage from a battery160.In a case where the output voltage of the battery160is equal to or higher than a predetermined voltage, the power-supply control circuit138selects the voltage of the battery160as power required for operation of an IC300when a reader/writer mode signal or a card mode signal is received. On the other hand, when the output voltage of the battery160is lower than the predetermined voltage, the power-supply control circuit138selects the output voltage from the rectifier131as power required for operation of the IC300.The present invention can be applied to a portable terminal, such as a cellular phone.

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patent: WO-99/41714 (1999-08-01), None

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