小型通信終端往往采用低功耗小尺寸的微控制器，I/O 引腳資源有限，但仍然要面對大量I/O 端口的需要。利用AVR 單片機片內(nèi)的一路ADC 以及相關(guān)的多檔位開關(guān)的模糊判決法和算術(shù)平均濾波算法，實現(xiàn)多檔位開關(guān)的檔位分辨，可以在節(jié)省多個I/O 口資源的基礎(chǔ)上簡化接口電路設(shè)計。實踐證明該方法具有較高工程實用價值。
關(guān)鍵詞：ADC；多檔位分辨；模糊判決；算術(shù)平均濾波
Multi-Switching Distinguish and Its Application in Small Communication Terminal Based on On-Chip ADC Yang fan, Zhao li (Guilin University of Electronic Technology, Guilin 541004, China) Abstract:A low power and small size microcontroller is needed in the small communication terminal, but its I/O ports is limited. A single ADC of AVR microcontroller is used in Multi-Switching distinguish. Based on this application methods of Fuzzy Decision and Arithmetic Average Filtering are presented, this topic has special important significance on saving the I/O ports and simplifying the circuit design. The result of a series of experiments shows that this technology has a high value on engineering.
Key words: ADC, Multi-Switching Distinguish, Fuzzy Decision, Arithmetic Average Filtering