TDA8024

` 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 (V_DDP and PGND)
` 3 or 5 V ± 5% regulated card supply voltage (V<sub>CC</sub>) with appropriate decoupling has the following capabilities:
I<sub>CC</sub> < 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, V<sub>DD</sub> or V<sub>DDP</sub> 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.

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 isa 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".