ST7LCR

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3

ST7LCR implementation

ST7LCRE4U1 and ST7LCRDIE6 offer single IC solutions and simplifies the integration of

smartcard interfaces into smartcard readers.

3.1

Functionality

A dedicated analog block provides the power supplies 1.8 V and 3 V necessary to interface

with different smartcard voltages available on the market. Voltages are selected by software.

A dedicated UART interface provides an IS07816 communication port for connection with

the smartcard connector. A full-speed USB interface port allows external connection to a

host computer.

3.2

Smartcard interface features

The ST7LCRE4U1 and ST7LCRDIE6 include the following features:

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Compatibility with asynchronous cards

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Compatibility with T=0 and T=1 protocols

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Compatibility with EMV and PC/SC modes.

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Compliance with ISO 7816-3 and 4 and ability to supply the cards with 1.8 V or 3 V

(class A, B or C cards, respectively)

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Resume/wake-up mode upon smartcard insertion/removal

The reader is able to communicate with smartcards up to the maximum baud rate allowed,

namely 344 086 bps (TA1=16) for a clock frequency of 4 MHz. Because the size of the

smartcard buffer is 261 bytes, care must be taken not to exceed this size during APDU

exchanges when the protocol in use is T=1.