Smart card capable of adjusting voltages supplied from external

Details Smart card capable of adjusting voltages supplied from external Smart card capable of adjusting voltages supplied from external

1998-04-21

2000-02-22

Le, Thien M.

Registers

Records

Conductive

G06K 1906

Patent

active

060270292

ABSTRACT:
A smart card capable of adjusting voltages supplied from an external device. In the smart card, a voltage detector detects levels of the voltages supplied from the external device and generates enable signals, if the detected levels are lower than a predetermined level. A voltage controller converts levels of the voltages supplied from the external device into levels of operating voltages of the smart card, in response to the enable signals. A logic level converter converts logic levels of signals received from the external device into logic levels of the smart card, based on a voltage difference between the voltages from the external device and the converted operating voltages.

REFERENCES:
patent: 4924171 (1990-05-01), Baba et al.
patent: 5128523 (1992-07-01), Diehl et al.
patent: 5804811 (1998-09-01), Saitoh et al.

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