XENSIV TMR sensor: Precise length measurements for diverse applications

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Infineon Technologies combines its proven expertise in magnetic position sensor with its established linearized tunnel magnetoresistance (TMR) technology to launch the XENSIV TLI5590-A6W magnetic position sensor. The sensor comes in a wafer-level package and is well suited for linear and angular incremental position detection. The device is qualified for industrial and consumer applications according to the JEDEC standard JESD47K and can be used as a replacement for optical encoders and resolvers. It is well suited for positioning lenses for zoom and focus adjustment in cameras.

The TLI5590 is a low field sensor with Infineon TMR technology which was developed for high-volume sensor systems. As a result, the sensor offers ultra-high sensitivity, low jitter, and low power consumption. Compared to linear Hall sensors, TMR sensors offer better linearity, lower noise, and lower hysteresis. The high signal-to-noise ratio and the lower power enable cost-effective magnetic designs with lower battery consumption.

As a result, the new sensor enables accurate detection with rapidly changing directions. The TLI5590 consists of two TMR Wheatstone bridges, where the TMR resistance depends on the direction and strength of the external magnetic field. In combination with a multipole magnet, each bridge provides a differential output signal, i.e., sine and cosine signals. These can be further processed for relative position measurement. 

The sensor is housed in an extreme small 6-ball wafer level package SG-WFWLB-6-3. Due to the higher integration density, the sensor size has been reduced, which supports miniaturization and position detection in microsystems. The TLI5590-A6W enables fine measurement with a very high accuracy of better than 10 µm, which is achieved by using a suitable linear or rotary magnetic encoder. With an extended operating temperature range of up to +125°C, the sensor can be used flexibly in various industrial and consumer applications. In addition, its high temperature stability makes it the perfect choice for use in harsh environments.