The AMR4020V fixed pitch magnetic scale sensor contains two push-pull Wheatstone bridges, each composed of four high-sensitivity anisotropic magnetoresistance (AMR) sensing elements. When the sensor moves along the length of the magnetic scale, the magnetic field changes caused by displacement, due to the alignment of the AMR elements with the magnetic pole width, result in the two Wheatstone bridges outputting two orthogonal sine wave signals. The period of the signal corresponds to the displacement of one magnetic pole width. Decoding these two sine wave signals allows for precise measurement of the relative displacement between the chip and the magnetic scale.

The internal structure of the sensor effectively compensates for the temperature drift, improving measurement accuracy in various application environments. The AMR4020V is housed in a small DFN21L (6 mm × 2 mm × 1.5 mm) package, with the magnetic sensing elements inside the sensor biased to one side of the package. This arrangement reduces the restrictions on the sensor’s installation distance, making the structural design of the application system more flexible and facilitating assembly in confined spaces.

Features and Benefits

Applications