引言

　　FPGA、微處理器、DS2482-100和DS2480B是常見的1-Wire主機(jī)器件。1-Wire/iButton?從器件由Maxim生產(chǎn)，該系列器件的典型工作電壓為2.8V至5.25V。過去，傳統(tǒng)的1-Wire主機(jī)和從器件均采用5V漏極開路邏輯。

　　現(xiàn)在，設(shè)計人員需要1-Wire主機(jī)IO提供1.8V的漏極開路邏輯。而大部分1-Wire從器件可以安全地工作在5V，它們中的絕大多數(shù)無法工作在1.8V。需要一個雙向電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器" target="_blank">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" 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title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" 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title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" 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title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" 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title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" 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title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器" title="電平轉(zhuǎn)換器">電平轉(zhuǎn)換器">電平轉(zhuǎn)換器克服這種限制。本參考設(shè)計(RD)采用Maxim?的MAX3394E雙向電平轉(zhuǎn)換器，用于解決這類應(yīng)用中的問題。

　　電平轉(zhuǎn)換器

　　MAX3394E雙向電平轉(zhuǎn)換器采用8引腳、3mm x 3mm TDFN封裝。借助其內(nèi)部擺率增強(qiáng)電路，可理想用于大電容負(fù)載驅(qū)動。1-Wire從器件電容負(fù)載通常大于500pF。MAX3394E的VCC I/O引腳具有±15kV HBM (人體模式)靜電保護(hù)，為1-Wire主機(jī)提供保護(hù)。1-Wire總線通常用于連接外部世界，HBM保護(hù)是基本需求。推薦在上拉電阻(R3)、可選擇的強(qiáng)上拉電路以及1-Wire從器件處使用DS9503P以增強(qiáng)ESD保護(hù)。

　　應(yīng)用電路

　　圖1所示電路利用MAX3394E實現(xiàn)1.8V至5V雙向電平轉(zhuǎn)換，系統(tǒng)采用漏極開路端口。

　　圖1. 1-Wire雙向電平(1.8V至5V)轉(zhuǎn)換器電路原理圖，注意，引腳I/O VL和I/O VCC具有10kΩ內(nèi)部上拉。

　　該參考設(shè)計的BOM (材料清單)如表1所示。

　　波形測量/測試結(jié)果

　　圖2至圖5是對*估電路板進(jìn)行測試得到的結(jié)果。

　　測試條件為：

　　VL = 1.8V

　　VCC = 5.0V

　　CH1：1-Wire主機(jī)(OW_MASTER)

　　CH2：DS1920 (OW_SLAVE)

　　OW_SLAVE線長：2.4米，最大值。

　　測試時沒有使用圖1中可選擇的強(qiáng)上拉電路。

　　僅在室溫下測量。

　　圖2. 從1-Wire復(fù)位波形可以看出MAX3394E的性能，在線應(yīng)答脈沖幅度不超過250mV，低于典型1-Wire主機(jī)VIL的0.4V最大電壓。

　　圖3. 1-Wire寫操作波形，寫“1”時隙，tLOW1 < 15µs。

　　圖4. 1-Wire寫操作波形，寫“0”時隙，60µs < tLOW0 < 120µs。

　　圖5. 1-Wire讀操作波形，1-Wire從機(jī)漏極開路端口返回的讀“0”時隙，電平低于典型1-Wire主機(jī)VIL的0.4V最大值。

　　結(jié)論

　　該參考設(shè)計用于實現(xiàn)1.8V至5V 1-Wire雙向電平轉(zhuǎn)換，驅(qū)動典型的1-Wire從器件。本文介紹了設(shè)計電路的搭建與測試，給出了電路原理圖、BOM及典型測試波形。