AK8970N

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Magnetic Sensors - Linear, Compass (ICs)

The AK8970N is a multi-axis magnetic sensor device used to detect absolute magnetic North and measure the magnitude of the three-axis magnetic field. This device is an ideal choice for compass pointing application and is used for autonomous navigation systems, image stabilisation, motion sensing, and human machine interface applications. It has ultra-low power consumption, adjustable sensitivity, wide operating temperatures, an SPI/I2C interface, and a footprint of 8.5mm x 8.5mm.

Overview

The AK8970N is an advanced multi-axis magnetic sensor device. It is designed for measuring the element magnetic fields generated from a given reference direction, or \'magnetic north\' for compass applications. The device consists of a 3-axis magnetoresistive sensor which detects three-dimensional elements of a local magnetic field. The magnetic sensor output is conditioned and converted to a digital format that can be read by any processor. The device includes an integrated on-chip driver that allows the signals to be used directly in the user’s system.

Features

The AK8970N provides many features that provide the user with a highly configurable solution for their compass pointing application. These features include:

• Ultra-low power consumption
• Adjustable sensitivity
• Wide operating temperature range of -40°C to +85°C
• Dual interface option: SPI or I2C
• High resolution output for improved accuracy
• Small footprint: 8.5mm x 8.5mm

Applications

The AK8970N is ideal for various applications where pointing accuracy is paramount. The device is suitable for stand-alone applications such as in autonomous navigation systems, image stabilisation, motion sensing, and human machine interface applications. It is also suitable in embedded systems such as in navigation and pointing systems.

Working Principle

The AK8970N consists of three current sensing magnetoresistive sensors. These sensors are sensitive to both the magnitude and direction of written field elements and convert the changes in local field components into digital data. The working principle of these magnetoresistive sensors consists of four phases. First, the individual temperature coefficients of the sensors are calibrated. In the second phase, the zero offset of each axis is calibrated and stored. The device then uses this data to correct the magnetic field readings. The third phase requires the user to set the sensitivity of the magnetic field sensing range. During the fourth and final phase, an autonomous periodic measurement of the magnetic field is taken. The device then continuously updates the calibration data and sensor readings.

Conclusion

The AK8970N is an advanced multi-axis magnetic sensor device designed to provide accurate, low-noise magnetic field sensing. This device is ideal for compass pointing applications such as autonomous navigation, image stabilisation, motion sensing, and human machine interface applications. The AK8970N provides ultra-low power consumption, adjustable sensitivity, wide operating temperatures, an SPI/I2C interface, and a small footprint. The technology behind the AK8970N consists of a temperature-calibrated, zero-offset magnetoresistive sensor with an autonomous measuring process for accurate magnetic field readings.

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