TLC2543是TI公司的12位串行模数转换器，使用开关电容逐次逼近技术完成A/D转换过程。由于是串行输入结构，能够节省51系列单片机I/O资源；且价格适中，分辨率较高，因此在仪器仪表中有较为广泛的应用。-TI' s TLC2543 12 serial ADC, using switched-capacitor successive approximation technique complete A/D conversion process. Because it is a serial input structure, can save 51 series I/O resources　and affordable, high resolution, so the instrument has more widely used.