|
|||||||||
 |
|
||||||||
|
|
||||||||||||||
| . 网站首页 . 新闻 . 新品 . 方案 . 专访 . 活动 . DSP . EDA . 评测室 . 技术文库 . 会员区 . 商城 . 服务导航 . 邮购 . 资源 . | ||
 |
||
|
||
|
|||||
| NXP TDA8023 低功耗 IC卡接口方案 | |||||
作者：NXP 文章来源：NXP 点击数： 更新时间：2008-1-31  |
|||||
|
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 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 |
|||||
| 欢迎点击进入：TI德州中文网 (国内唯一针对TI应用的中文技术网站) 文章录入：admin 责任编辑：admin | |||||
| 【发表评论】【加入收藏】【告诉好友】【打印此文】【关闭窗口】 | |||||
| 网友评论：（只显示最新10条。评论内容只代表网友观点，与本站立场无关！） |
| | 设为首页 | 加入收藏 | 联系站长 | 友情链接 | 版权申明 | 网站公告 | 管理登录 | | |||
|
