NXP TDA8023低功耗IC卡接口方案

        NXP 公司的TDA8023是完整的低功耗同步或异步智能 IC卡模拟接口芯片。它用在卡和微控制器之间，用很少的外接元件就能提供电源，保护和控制功能，广泛用在银行终端，互联网终端，机顶盒和手提IC卡阅读器。

      本文介绍TDA8023主要性能，方框图以及典型应用电路图。

        The TDA8023 is a complete cost-efficient, low-power analog interface for synchronous or asynchronous smart cards. It can be placed between the card and the microcontroller wit very few external components to perform all supply, protection and control functions.

        主要性能： 
        I2C-bus controlled IC card interface in TSSOP28
        Supply voltage from 2.7 V to 6.5 V
        Independant supply voltage VDD(INTF) for interface signals with the microcontroller
        Shutdown input for very low power consumption when the part is not used
        Power reduction modes when the card is active
        DC-to-DC converter for VCC generation (capacitive doubler, tripler, or inductive, or
        follower automatically selected according to supply voltage and card voltage)
        1 specific protected half duplex bidirectional buffered I/O line, with current limitation at
        15 mA, maximum frequency 1 MHz
        2 auxiliary card I/O lines controlled by I2C-bus (C4 and C8)
        VCC regulation: 5 V, 3 V or 1.8 V &#61617;&#61472;8 %, ICC < 55 mA, current spikes of 40 nAs up to
        20 MHz, with controlled rise and fall times, filtered overload detection approximately
        80 mA, current limitation about 120 mA
        Thermal and short-circuit protections 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 VDD(DCDC) drop-out
        Enhanced ElectroStatic Discharge (ESD) protection on card side (> 6 kV)
        20 MHz clock input
        Clock generation for the card up to 10 MHz (CLKIN divided by 1, 2, 4 or 5) with
        synchronous frequency changes; stop HIGH or LOW or free running 1 MHz in cards
        Low-power mode; current limitation on pin CLK (C3)
        RST signal (C2) with current limitation at 20 mA, controlled by an embedded
        programmable CLK pulse counter on asynchronous cards or by a register on
        synchronous cards
        ISO 7816-3, GSM 11.11 and EMV 2000 (payment systems) compatibility
        Supply voltage supervisor for spike killing during power-on and emergency         deactivation at power-off: threshold internally fixed or set via an external resistor bridge; pulse width internally fixed or set via an external capacitor
        Card presence input with 10 ms built-in debouncing system
        One interrupt signal INT

       应用：
      Banking terminals
      Internet terminals
      Set-top boxes
      Portable IC card readers

图1。带容性DC/DC转换器的 TDA8023方框图

图2带感性DC/DC转换器的 TDA8023方框图

图3带容性DC/DC转换器的 TDA8023 TT应用电路图

本文来源：NXP     作者：

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