The MI sensors change inductance by 100% over its field measurement range. This variable inductance property is used in a cost and space efficient ASIC (PNI 11096) which incorporates a patented temperature and noise stabilized oscillator/counter circuit with an SPI interface.
The microprocessor compatible SPI interface allows easy access to the MicroMag's measurement parameters and resulting field measurement data. Advantages include 3V operation, low power consumption, large signal noise immunity under all conditions, and a large dynamic range. Resolution and field measurement range are software configurable for a variety of applications.
The measurement is very stable over temperature and inherently free from offset drift. These advantages make PNI Corporation's MicroMag3 the choice for prototyping, education and low volume applications.
A reference design is also available for use in high volume applications. Features Complete 3-axis magnetometer draws < 500 µA at 3 VDC. Operation as low as 2.2 VDC. Part size: 25.44 x 25.1 x 19 mm. DIP configuration for easy prototyping. Field measurement range ±1100 µT (±11 Gauss) Resolution as low as 0.015 µT (0.00015 Gauss) All digital solution, no additional circuitry is required. SPI protocol for interfacing to a processor.
Applications Robotic applications. High-performance magnetic field sensing. High-performance solid state navigation equipment for automotive, marine, and aeronautic applications. Direction-finding features for any device where bearing or attitude indicators have value.