General description

The TDA8025 is a cost-effective analog interface for asynchronous smart cards operating at 3 V, 1.8 V or optionally, 1.2 V. Using few external components, the TDA8025 provides integrated supply, protection and control functions for a range of applications.

Features

■ Integrated circuit smart card interface

■ 3 V, 1.8 V or 1.2 V smart card supply

■ Low power consumption in inactive mode

■ Three protected, half duplex, bidirectional buffered input/output lines (C4, C7 and C8)

■ VCC regulation:

◆ 3 V, 1.8 V or optionally 1.2 V at ± 5 using one 220 nF and one 470 nF low ESR multilayer ceramic capacitor.

◆ Current pulse handling for pulses of 40 nAs at VCC = 3 V, 15 nAs at VCC = 1.8 V or VCC = 1.2 V up to 20 MHz

■ Thermal and short-circuit protection for all card contacts

■ Automatic activation and deactivation sequences triggered by short-circuit, card take-off, overheating, falling VDD(INTF) and VDD(INTREGD)

■ Enhanced card-side ElectroStatic Discharge (ESD) protection of > 6 kV

■ Clock signal using the internal oscillator or an external crystal (≤ 26 MHz) connected to pin XTAL1

■ Card clock generation up to 20 MHz with synchronous frequency changes of fxtal, 1?2 fxtal, 1?4 fxtal or 1?8 fxtal using pins CLKDIV1 and CLKDIV2

■ Non-inverted control of pin RST using pin RSTIN

■ NDS certified

■ Supply supervisors during power on and off:

◆ VDD(INTREGD) using a fixed threshold

◆ VDD(INTF) using resistor bridge threshold adjustment

■ Built-in debouncing on card presence contacts (typically 4.5 ms)

■ Multiplexed status signal using pin OFFN

Applications

■ Pay TV

■ Electronic payment

■ Identification

■ Bank card readers

TDA8025HN屬于集成電路（IC） > 專用。恩智浦半導(dǎo)體公司制造生產(chǎn)的TDA8025HN專用該系列產(chǎn)品可提供所需的功能，用以將信息源/信宿連到各種復(fù)雜或范圍狹窄應(yīng)用中的傳感器、變送器、致動(dòng)器、傳輸介質(zhì)或其他此類端點(diǎn)。例如，汽車安全氣囊驅(qū)動(dòng)器、車身控制和信息娛樂總線、自適應(yīng)電纜均衡器、智能卡等等。