The SM324-10E smart magnetometer from NVE is designed to provide ultra-precise magnetic field measurements while detecting magnets even over 50mm away. It utilises Tunneling Magnetoresonance (TMR) technology, which is superior compared to the traditional Hall-effect devices in terms of in-plane sensitivity, precision (±0.3% accuracy), speed (300 samples per second) and noise levels. The I²C interface works as data as well as programming interface; the programmable values include magnetic thresholds, sensor offset, temperature values, user-defined memory and other values. The digital signal also allows for application-specific calibration; the calibration coefficient is stored in internal non-volatile memory. The SM324-10E is capable of withstanding harsh environments, including those in automotive applications, due to their robust ESD protection, and is available in ultraminiature TDFN6 package (2.5×2.5mm footprint).

• Smart TMR Magnetometer
• Magnetic field operating range of 0 to ±20 Oe
• 24bit output resolution
• Accuracy as low as ±0.3% at 25° (±1% across the temperature range)
• Sample rate of 300 samples per second
• Temperature range of −40°C to +125°C
• 1.68V to 3.6V supply
• Programmable features include offset and gain correction, I²C address and thresholds
• Sophisticated digital signal processing
• Ultraminiature TDFN6 package

Typical applications for the SM324-10E series include:

• Proximity sensing
• Noncontact current sensing
• Robotics
• Automotive applications
• Internet of Things (IoT) end nodes

The below table gives the full specifications of the NVE SM324-10E smart TMR magnetometer: