Card out of socket detector for IC cards

Details Card out of socket detector for IC cards Card out of socket detector for IC cards

1995-03-10

1996-12-31

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307147, 361737, 361736, 439 79, 439296, H05K 111

Patent

active

055897193

ABSTRACT:
The present invention discloses a novel card out of socket detector circuit for IC cards, especially PCMCIA type cards. Multiple uses of the card detect signal in the IC card interface are provided. The disconnection of system pins is detected and the generation of a card out of socket response signal is created. Such as in the case of high vibration when a connection is temporarily disconnected. A power supply ramping circuit is provided so that when the IC card is connected or disconnected from the host terminal unit there are no voltage spikes within the IC card which will corrupt the operation of certain types of memory particularly in the case of voltage supply sensitive battery backed DRAM IC cards. A power supply circuit is provided which is capable of boosting a voltage from a power source. A controlled transfer from a first removable battery to a second fixed rechargeable battery is also provided that does not create excessive voltage bumps.

REFERENCES:
patent: 5334046 (1994-08-01), Brouilette et al.
patent: 5365221 (1994-11-01), Fennell et al.
patent: 5384492 (1995-01-01), Carlson et al.
patent: 5408386 (1995-04-01), Ringer et al.
patent: 5451933 (1995-09-01), Stricklin et al.
patent: 5463261 (1995-10-01), Skarda et al.

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