The SM225-10E smart magnetometer from NVE is designed to provide precise magnetic field measurements, detecting magnets even over 50mm away. The sensors combine precise Tunneling
Magnetoresistance (TMR) sensor elements with easy-to-use
digital signal processing, Unlike awkward, old-fashioned Hall-effect sensors, TMR is
sensitive in-plane for optimal current sensing and easy
mechanical interfaces. TMR also provides more sensitivity,
higher precision (2%), higher speed (15kSps), and lower noise than Hall. This magnetometer is a digital device with a 4-wire SPI interface, providing magnetic field data and a way to set parameters such as thresholds. The SM225-10E sensor comes factory calibrated to high accuracy, with the calibration coefficients stored in internal non-volatile memory and is available in ultra-miniature TDFN6 packaging (2.5 x 2.5mm footprint).

• Smart TMR Magnetometer
• Wide 0 to 15 mT/0 to 150 Oe linear range
• 10 bit output resolution
• 2% FS accuracy for 0 to 125 °C
• 15kSps sample rate for fast response
• Temperature range of −40°C to +125°C
• 2.2V to 3.6V supply
• 3.3V or 5V compatible 4-wire SPI interface
• Analog field measurements plus on/off digital output
• In-plane sensitivity
• Ultraminiature 2.5mm x 2.5mm TDFN6 package

Typical applications for the SM225-10E series include:

• Proximity sensing
• Current sensing
• Security and intrusion detection
• Automotive applications
• Cylinder position sensing

The below table gives the full specifications of the NVE -10E smart TMR magnetometer: