TDA8024T

IC卡接口 IC card interface

Overview

The TDA8024 is a complete and cost-efficient analog interface for asynchronous 3 V 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 internet site www.nxp.com and from _“Application note AN10141”_.

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## 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 pct supply VDDP and PGND

* 3 or 5 V +- 5 pct 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.

## Target Applications

* IC card readers for banking

* Electronic payment

* Identification

* Pay TV.

## Features