Stray field TMR sensor for high-precision length measurements
Infineon Technologies has combined its magnetic position sensing technology with its linearized tunnel magnetoresistance (TMR) technology for high precision length measurements.
The Infineon XENSIV TLI5590-A6W magnetic position sensor 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.
This enables accurate detection with rapidly changing directions with high sensitivity of 9/18 mV/V/mT, 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.
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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 sensor is housed in an extreme small 6-ball wafer level package SG-WFWLB-6-3.
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.
The TLI5590-A6W can be ordered now.
www.infineon.com/linear-sensors/tli5590-a6w
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