它用在卡和微控制器之間，用很少的外接元件就能提供電源，保護和控制功能，廣泛用在銀行終端，互聯網終端，機頂盒和手提IC卡閱讀器。本文介紹TDA8023主要性能，方框圖以及典型應用電路圖。
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 < 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
應用：
Banking terminals
Internet terminals
Set-top boxes
Portable IC card readers
圖1 帶容性DC/DC轉換器的 TDA8023方框圖
圖2帶感性DC/DC轉換器的 TDA8023方框圖
圖3帶容性DC/DC轉換器的 TDA8023 TT應用電路圖