TMR Magnetometer is a fast and accurate sensor, ideal for proximity or non-contact current detection
NVE Corporation’s SM225-10E high-speed Tunneling Magnetoresistance (TMR) Smart Magnetometer is part of a family of transformative sensors defining the new state-of-the-art for magnetic sensing technology. TMR technology offers higher accuracy, higher sensitivity, better temperature stability, lower power consumption, and smaller package sizes compared to Hall effect sensors. Higher-performance TMR sensors like the SM225-10E are ideal for the Industrial Internet of Things revolution, which demands better sensors, better connectivity, and better prices.
The SM225-10E combines a unique TMR sensor element with elegant digital signal processing in an ultraminiature DFN package. A high-speed Serial Peripheral Interface (SPI) interface provides access to sensor data and programmable parameters.
The SM225-10E is a general-purpose, programmable magnetometer with high sensitivity and high accuracy. The TMR sensor elements are sensitive in-plane, which is optimal for non-contact current sensing and off-axis mechanical magnet configurations.
SM225-10E parts are used with either ferrite or rare-earth permanent magnets and can detect over 60 millimeters of linear travel.
The sensor can also stand as a non-contact current sensor with unlimited isolation. Typical current ranges are ±250A up to ±1000A.
The sensor can be used for linear sensing or as a switch with programmable open-and-close thresholds.
In short, the SM225 is the most accurate high-speed magnetometer in its class. With a total accuracy specification of two percent of full-scale over a 0 to 125 degree Celsius operating temperature range, and four percent over the full minus 40 to 125 degree Celsius operating range. Accuracy is specified as a percentage of the SM225’s full-scale range of 15 millitesla (150 oersteds). The accuracy specification covers all error sources, including sensitivity, offset, nonlinearity, hysteresis, noise, and supply variation.
Following is the summary of Key SM225-10E features:
- Wide 0 to 150 Oe / 0 to 15 mT linear range
- Can detect ordinary magnets more than 50 mm away
- Fast SPI interface
- 2% of full-scale accuracy for 0 to 125°C
- Fast 15000 samples per second update rate
- Factory calibrated
- Programmable offset and gain compensation
- -40°C to 125°C operating range
- Ultraminiature 2.5 x 2.5 mm TDFN package
The AG953H-07E Evaluation Kit has everything needed to evaluate the SM225-10E. The Kit includes an evaluation board with an SM225-10E sensor and a microcontroller with a USB interface, evaluation software, a permanent magnet, and a current-carrying busbar with screw connections.
NVE is a leader in the practical commercialization of spintronics, a nanotechnology that relies on electron spin rather than electron charge to acquire, store and transmit information. The company manufactures high-performance spintronic products including sensors and couplers that are capable to acquire and transmit data. NVE has also licensed its spintronic magnetoresistive random access memory technology, commonly known as MRAM.
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