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              南麟電子推出低功耗無極性全時檢測霍爾開關LN245MR
              作者:admin時間:2017-07-07 11:02:02閱讀:6248

                上海南麟電子股份有限公司最近推出一款檢測周期為350us(VDD=3V)無極性霍爾開關電路,LN245MR 是一款基于混合信號CMOS 技術的無極性霍爾開關,這款IC 采用了先進的斬波穩定技術,因而能夠提供準確而穩定的磁開關點。

                在電路設計上,LN245MR提供了一個內嵌的受控時鐘機制來為霍爾器件和模擬信號處理電路提供時鐘源,同時這個受控時鐘機制可以發出控制信號使得消耗電流較大的電路周期性的進入“休眠”模式;同樣通過這個機制,芯片被周期性的“喚醒”并且根據預定好的磁場強度閾值檢測外界穿過霍爾器件磁場強度的大小。如果磁通密度高于“操作點”閾值或者低于“釋放點”閾值,則開漏輸出晶體管被驅動并鎖存成與之相對應的狀態。而在“休眠”周期中,輸出晶體管被鎖定在其先前的狀態下。

                LN245MR的輸出晶體管在面向封裝標示一面存在一定強南極或北極磁場時被鎖定在開狀態,而在無磁場時鎖定在關狀態。

                采用SOT23-3封裝。

              關鍵技術指標:

              工作電壓VDD:1.8-5.5(V)
              平均功耗IQ:350μA(VDD=3V)
              磁場反轉點B=±1.5mT(VDD=1.8V-5.5V)
              磁場遲滯值:BHYS=0.4mT

              典型應用電路:

              圖片1.png

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