NXPTDA8023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 ?8 %, ICC 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