LTC1955

www.DataSheet4U.com FEATURES s s LTC1955 Dual Smart Card Interface with Serial Control DESCRIPTIO The LTC®1955 provides all necessary supervisory and power control functions for two smart cards, two S.A.M. cards or a combination of S.A.M. and smart cards. It provides a charge pump for battery powered applications as well as all necessary level shifting circuitry. The card voltages can be independently set to 1.8V, 3V or 5V. Both card interfaces include a card detection channel with automatic debounce circuitry. To reduce wiring costs, the LTC1955 interfaces to a microcontroller via a simple 4-wire serial interface. Multiple devices may be connected in daisy-chain fashion so that the number of wires to the card socket board is independent of the number of sockets. Status data is returned over the same interface. Extensive security features ensure proper deactivation sequencing in the event of a supply fault or a smart card electrical fault. The smart card pins can withstand greater than 10kV ESD in-situ with no additional components. The LTC1955 is available in a small 5mm × 5mm QFN package. , LTC and LT are registered trademarks of Linear Technology Corporation. *U.S. Patent No. 6,411,531 s s s s s s s s s s U APPLICATIO S s s s s s s Compatible with ISO7816-3 and EMV Electrical Specifications Power Management and Control for Two Smart Cards Control/Status Serial Port May be Daisy-Chained for Multicard Applications Automatic Shutdown on Electrical Faults Buck/Boost Cha...