MultiDimension Technology Co., Ltd. TMR Geartooth Sensor TMR4006

Description The TMR4006 geartooth sensor adopts a unique push-pull Wheatstone bridge design. This design includes a single-channel or dual-channel Wheatstone full bridge composed of four or eight unshielded high-sensitivity tunneling magnetoresistance (TMR) sensing elements. The Wheatstone bridge provides a differential voltage output along the gradient of the applied magnetic field along the sensor’s sensing direction. The dual-channel Wheatstone full bridge generates two orthogonal sine/cosine voltage output signals to measure the position of the gear rotation and detect the direction of rotation. The high-sensitivity performance of the TMR4006 enables detection of small magnetic field changes, and its output signal has good temperature stability. The TMR4006 is available in compact LGA6L (3mm × 6mm × 0.9mm) package, with 2.0 mm of TMR sensing element spacing. LGA6L Features and Benefits Tunneling magnetoresistance (TMR) technology High sensitivity to magnetic gradient High saturation field allows operation in large DC magnetic field Compatible to small pitch gear measurement Sine/cosine signal output with accurate phase difference Wide air gap tolerance Excellent resistance to external magnetic field interference DC (zero speed) operation Excellent thermal stability Compact package RoHS & REACH compliant Applications Gear speed and direction measurement Linear and angular speed sensing Linear and angular displacement sensing Magnetic scale Magnetic encoder