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LN245
CMOS 無(wú)極性高靈敏度高頻霍爾開(kāi)關(guān)
LN245 是一款基于混合信號(hào) CMOS 技術(shù)的無(wú)極性霍
爾開(kāi)關(guān)，這款 IC 采用了先進(jìn)的斬波穩(wěn)定技術(shù)，因而能夠提
供準(zhǔn)確而穩(wěn)定的磁開(kāi)關(guān)點(diǎn)。
在電路設(shè)計(jì)上，LN245 提供了一個(gè)內(nèi)嵌的受控時(shí)鐘機(jī)制
來(lái)為霍爾器件和模擬信號(hào)處理電路提供時(shí)鐘源，同時(shí)這個(gè)受
控時(shí)鐘機(jī)制可以發(fā)出控制信號(hào)使得消耗電流較大的電路周期
性的進(jìn)入“休眠”模式；同樣通過(guò)這個(gè)機(jī)制，芯片被周期性
的“喚醒”并且根據(jù)預(yù)定好的磁場(chǎng)強(qiáng)度閾值檢測(cè)外界穿過(guò)霍
爾器件磁場(chǎng)強(qiáng)度的大小。如果磁通密度高于“操作點(diǎn)”閾值
或者低于“釋放點(diǎn)”閾值，則開(kāi)漏輸出晶體管被驅(qū)動(dòng)并鎖存
成與之相對(duì)應(yīng)的狀態(tài)。而在“休眠”周期中，輸出晶體管被
鎖定在其先前的狀態(tài)下。
LN245 的輸出晶體管在面向封裝標(biāo)示一面存在一定強(qiáng)
南極或北極磁場(chǎng)時(shí)被鎖定在開(kāi)狀態(tài)，而在無(wú)磁場(chǎng)時(shí)鎖定在關(guān)
狀態(tài)。
■ 產(chǎn)品概述
LN245 是一款基于混合信號(hào) CMOS 技術(shù)的無(wú)極性霍 爾開(kāi)關(guān)，這款 IC 采用了先進(jìn)的斬波穩(wěn)定技術(shù)，因而能夠提 供準(zhǔn)確而穩(wěn)定的磁開(kāi)關(guān)點(diǎn)。 在電路設(shè)計(jì)上，LN245 提供了一個(gè)內(nèi)嵌的受控時(shí)鐘機(jī)制 來(lái)為霍爾器件和模擬信號(hào)處理電路提供時(shí)鐘源，同時(shí)這個(gè)受 控時(shí)鐘機(jī)制可以發(fā)出控制信號(hào)使得消耗電流較大的電路周期 性的進(jìn)入“休眠”模式；同樣通過(guò)這個(gè)機(jī)制，芯片被周期性 的“喚醒”并且根據(jù)預(yù)定好的磁場(chǎng)強(qiáng)度閾值檢測(cè)外界穿過(guò)霍 爾器件磁場(chǎng)強(qiáng)度的大小。如果磁通密度高于“操作點(diǎn)”閾值 或者低于“釋放點(diǎn)”閾值，則開(kāi)漏輸出晶體管被驅(qū)動(dòng)并鎖存 成與之相對(duì)應(yīng)的狀態(tài)。而在“休眠”周期中，輸出晶體管被 鎖定在其先前的狀態(tài)下。 LN245 的輸出晶體管在面向封裝標(biāo)示一面存在一定強(qiáng) 南極或北極磁場(chǎng)時(shí)被鎖定在開(kāi)狀態(tài)，而在無(wú)磁場(chǎng)時(shí)鎖定在關(guān) 狀態(tài)。
■ 額定工作參數(shù)
工作溫度范圍 TMIN ≤ TA ≤ TMAX ?40°C ≤ TA ≤ 85°C 工作電壓范圍 1.8V ≤ VDD ≤ 6.0V
■ 產(chǎn)品特點(diǎn)
? 磁開(kāi)關(guān)點(diǎn)的高靈敏度高穩(wěn)定性
? 高頻檢測(cè)
? 抗機(jī)械應(yīng)力強(qiáng)
? 數(shù)字輸出信號(hào)
? 無(wú)極性的開(kāi)關(guān)
■ 用途
? 移動(dòng)電話(huà)
? 筆記本電腦
? 便攜電子設(shè)備等
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