基于最少器件电路替代智能卡接口芯片的设计

Design of a replacement circuit of the smart card interface chip based on a minimun device circuit

简述了数字电视系统中智能卡的工作原理,介绍了智能卡接口芯片TDA8024的功能,由此设计了一款电路替代TDA8024,并分析了测试结果。结果表明,此电路能够很好的替代TDA8024实现智能卡与机顶盒的通信,符合ISO7816标准,有效地降低了成本。目前此电路已经应用于数字机顶盒产品中。

This paper introduces the working principle of smart card and the functions of interface chip TDAS024 in digital television system. Then a replacement circuit of interface chip named TDA8024 is designed. At last the test results are given. The circuit can be a good alternative to TDAS024, implementing the communications of smart card and set-top box. The circuit is in accordance with the ISO 7816 standard, and reduces cost effectively. It has been applied to the digital set-top box products.