Smart Card Interface 28-Pin TSSOP T/R

The ST8024 is a complete low cost analog interface for asynchronous 3 V and 5 V smart cards. It can be placed between the card and the microcontroller with few external components to perform all supply protection and control functions. ST8024 is a direct replacement of ST8004.Main applications are: smartcard readers for settop- box, IC card readers for banking, identification, pay TV.

Designed to be compatible with the NDS conditional access system

IC card interface

3 or 5 V supply for the IC (V_DD and GND)

Three specifically protected half-duplex bidirectional buffered I/O lines to card contacts C4, C7 and C8

DC-DC converter for V_CC generation separately powered from a 5 V ± 20% supply (V_DDP and PGND)

3 or 5 V ± 5 % regulated card supply voltage (V_CC) with appropriate decoupling has the following capabilities: I_cc < 80 mA at V_DDP = 4 to 6.5 V Handles current spikes of 40 nA up to 20 MHz Controls rise and fall times Filtered overload detection at approximately 120 mA

Thermal and short-circuit protection on all card contacts

Automatic activation and deactivation sequences; initiated by software or by hardware in the event of a short-circuit, card take-off, overheating, V_DD or V_DDP drop-out

Enhanced ESD protection on card side (> 6 kV)

26 MHz integrated crystal oscillator

Clock generation for cards up to 20 MHz (divided by 1, 2, 4 or 8 through CLKDIV1 and CLKDIV2 signals) with synchronous frequency changes

Non-inverted control of RST via pin RSTIN

ISO 7816, GSM11.11 and EMV (payment systems) compatibility

Supply supervisor for spike-killing during power-on and power-off and power-on reset (threshold fixed internally or externally by a resistor bridge)

Built-in debounce on card presence contacts

One multiplexed status signal off