ST8024_08 Datasheet, PDF (1/31 Pages) STMicroelectronics – Smartcard interface

ST8024
Smartcard interface
Features
■ 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 bi-
directional 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
SO-28
TSSOP28
■ 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
Description
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 set-
top-box, IC card readers for banking,
identification, pay TV.
Table 1. Device summary
Order codes
Temperature range
ST8024CDR
-25 to 85 °C
ST8024CTR
-25 to 85 °C
June 2008
Package
SO-28 (tape and reel)
TSSOP28 (tape and reel)
Rev 7
Packaging
1000 parts per reel
2500 parts per reel
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