描述 Description

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 NXP internet site (www.nxp.com) and from “Application note AN10141”.

特性 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 ApplicationsIC card readers for banking
Electronic payment
Identification
Pay TV.

應(yīng)用 Application

IC card readers for banking
Electronic payment
Identification
Pay TV.