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    • 8. 发明公开
    • 저전력 자기장 센서
    • 低功率磁场传感器
    • KR1020100032428A
    • 2010-03-25
    • KR1020107001173
    • 2008-05-05
    • 알레그로 마이크로시스템스, 엘엘씨
    • 두그,마이클,씨.밀라노,숀,디.데이비드,폴
    • G01D5/14G01P13/04G01P3/487G01R33/00
    • G01D5/145G01P3/487G01P13/00G01P13/04G01P13/045
    • A magnetic field sensor for low power applications includes a magnetic field sensing element that, during sample intervals, provides a signal proportional to a sensed magnetic field and also includes a comparator circuit that, during the sample intervals, compares the magnetic field signal to threshold levels to generate a sensor output signal indicative of a strength of the magnetic field. According to a dual sample rate feature, initially the magnetic field signal is sampled at a first predetermined sample rate and, following detection of a transition of the sensor output signal, is sampled at a second, faster predetermined sample rate for a predetermined interval. According to a user-programmable sample rate feature, a user may operate the sensor at a fixed, predetermined sample rate or at a user-specified sample rate. The magnetic field sensor may detect the speed and/or direction of rotation of a rotating magnetic article.
    • 用于低功率应用的磁场传感器包括磁场感测元件,其在采样间隔期间提供与感测磁场成比例的信号,并且还包括比较器电路,其在采样间隔期间将磁场信号与阈值电平进行比较 以产生表示磁场强度的传感器输出信号。 根据双采样率特征,首先以第一预定采样速率对磁场信号进行采样,并且在检测到传感器输出信号的转变之后,以预定间隔以第二更快的预定采样速率采样。 根据用户可编程的采样率特征,用户可以以固定的,预定的采样率或以用户指定的采样率来操作传感器。 磁场传感器可以检测旋转磁性制品的速度和/或旋转方向。