描述 Description

HAL 300和HAL 320是以CMOS技術(shù)生產(chǎn)的差動(dòng)開(kāi)關(guān)。傳感器包括兩個(gè)主動(dòng)偏置補(bǔ)償?shù)臏囟妊a(bǔ)償霍爾片，一個(gè)帶有施密特觸發(fā)器的差動(dòng)放大器，和一個(gè)開(kāi)漏輸出晶體管。差動(dòng)傳感器感應(yīng)磁場(chǎng)的空間位置變化。差動(dòng)放大器會(huì)放大S1和S2兩塊霍爾片的霍爾電壓。差動(dòng)信號(hào)和施密特觸發(fā)器中預(yù)設(shè)的開(kāi)關(guān)值進(jìn)行比較。相應(yīng)地，輸出晶體管進(jìn)行開(kāi)關(guān)動(dòng)作。在HAL300打標(biāo)面封裝前旋轉(zhuǎn)的多極磁環(huán)可以產(chǎn)生差動(dòng)信號(hào)，或者在HAL320的封裝背面在兩個(gè)霍爾片產(chǎn)生反偏壓。主動(dòng)偏置補(bǔ)償使得磁參數(shù)在全電壓和全溫度下都是持續(xù)的。該傳感器系為汽車(chē)和工業(yè)應(yīng)用設(shè)計(jì)，工作電壓從4.5伏到24伏，溫度范圍從–40 °C up to 170 °C。有SMD ?SOT89B 和鉛封版 TO92UA兩種封裝。

特性 Features

·Distance between Hall plates: 2.05?mm
·Operates from 4.5 V to 24 V supply voltage
·Switching offset compensation at 62 kHz
·Overvoltage protection
·Reverse-voltage protection at VDD-pin
·Short-circuit protected open-drain output by thermal shutdown
·Operates with magnetic fields from DC to 10 kHz
·Output turns low with magnetic south pole on branded side of package and with a higher magnetic flux density in sensitive area S1 as in S2
·On-chip temperature compensation circuitry minimizes shifts of the magnetic parameters over temperature and supply voltage range
·The decrease of magnetic flux density caused by rising temperature in the sensor system is compensated by a built-in negative temperature coefficient of hysteresis
·EMC corresponding to ISO 7637