来电显示DTMF解码器9270D的单片机测试方案

MCU Scheme to Test DTMF Decoder 9270D with Function of Display of Dial-in-number

利用 930 2电话拨号器产生DTMF测试信号 ,由 16C5 4单片机编程进行测试控制 ,可以很方便对解码器 92 70D进行功能验证 ,其方案具有测试线路简单 ,制作方便 ,成本低廉 。

A scheme to test decoder 9270D is designed,and the signal DTMF is generated by a dialer CSC9302D.The test is controlled by MCU 16C54,with the advantage of simple circuit,low cost,and high accuracy.