General description The TDA8034T/TDA8034AT is a cost-effective analog interface for asynchronous and synchronous smart cards operating at 5 V or 3 V. Using few external components, the TDA8034T/TDA8034AT provides all supply, protection and control functions between a smart card and the microcontroller. Features and benefits ■ Integrated circuit smart card interface in an SO16 package ■ 5 V or 3 V smart card supply ■ One protected half-duplex bidirectional buffered I/O line (C7) ■ VCC regulation: ◆ 5 V ± 5 % or 3 V ± 5 % using two low ESR multilayer ceramic capacitors: one of 220 nF and one of 470 nF ◆ current spikes of 40 nA/s (VCC = 5 V and 3 V) or 15 nA/s (VCC =1.8 V) up to 20 MHz, with controlled rise and fall times and filtered overload detection of approximately 120 mA ■ Thermal and short-circuit protection for all card contacts ■ Automatic activation and deactivation sequences triggered by a short-circuit, card take-off, overheating, falling VDD, VDD(INTF) or VDDP ■ Enhanced card-side ElectroStatic Discharge (ESD) protection of > 6 kV ■ External clock input up to 26 MHz connected to pin XTAL1 ■ Card clock generation up to 20 MHz using pin CLKDIV1 with synchronous frequency changes of: ◆ 1⁄2 fxtal or 1⁄4 fxtal on TDA8034T ◆ fxtal or 1⁄2 fxtal on TDA8034AT ■ Non-inverted control of pin RST using pin RSTIN ■ Compatible with ISO 7816, NDS and EMV 4.2 payment systems ■ Supply supervisor for killing spikes during power on and off: ◆ using a fixed threshold ◆ using an external resistor bridge with threshold adjustment ■ Built-in debouncing on card presence contacts (typically 4.5 ms) ■ Multiplexed status signal using pin OFFN Applications ■ Pay TV ■ Electronic payment
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