Description

The TMR4101 magnetic scale sensor contains

two push-pull half-bridges, each consisting of two

high-sensitivity tunnel magnetoresistance (TMR)

elements. The layout of the TMR elements matches the

width of the magnetic poles. When the sensor moves

along the length of the scale, the sensor outputs two

quadrature sine wave signals, each corresponding

to the width of a pair of magnetic poles. By decoding

these two sine wave signals, the relative displacement

between the chip and the scale can be accurately

measured.

The TMR4101 magnetic scale sensor chip uses a small

package DFN4L (1.32 mm × 0.66 mm × 0.3 mm), which

reduces the requirements for chip installation, making

the structural design of the system more flexible and

convenient for assembly in narrow spaces.

MultiDimension Technology can provide magnetic scale

medium with customizable lengths as the accessory of

TMR4101 to meet our customers’ needs.

Features and Benefits

• Tunneling magnetoresistance (TMR)

technology

• Detects magnetic scale period of 0.8 mm

• High sensitivity

• Wide operating voltage range

• Allows for larger air gap

• Analog voltage outputs for A and B phases

• Good temperature stability

• RoHS & REACH compliant

Applications

• Camera Autofocus System

• Gear motion speed and direction detection

• Linear and angular velocity sensing

• Linear and curved displacement measurement

• Magnetic scale and magnetic encoder