TDA8024TT - IC card interface
FEATURES
IC card interface
3 or 5 V supply for the IC (VDD and GND)
Three specifically protected half-duplex bidirectional
buffered I/O lines to card contacts C4, C7 and C8
DC/DC converter for VCC generation separately
powered from a 5 V ± 20% supply (VDDP and PGND)
3 or 5 V ± 5% regulated card supply voltage (VCC) with
appropriate decoupling has the following capabilities:
– ICC < 80 mA at VDDP = 4 to 6.5 V
– Handles current spikes of 40 nAs 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, VDD or VDDP
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); not for TDA8024AT
Built-in debounce on card presence contacts
One multiplexed status signal OFF.
APPLICATIONS
IC card readers for banking
Electronic payment
Identification
Pay TV.
3 GENERAL DESCRIPTION
The TDA8024 is a complete and cost-efficient analog
interface for asynchronous 3 or 5 V smart cards. It can be
placed between the card and the microcontroller to
perform all supply, protection and control functions. Very
few external components are required. The TDA8024AT is
a direct replacement for the TDA8004AT.
More information can be obtained from the Philips Internet
site (http://www.semiconductors.philips.com) and from
“Application note AN10141”.
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