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AKM releases a Tri-axis Magnetic Sensor for IoT Designs; the AK09970 captures Magnetic Fields with Vector Components

2017/01/06 (updated 2017/04/04)


There is increasing demand for a sensing function to monitor an object’s status in remote locations as IoT products are expected to grow in the market.

Asahi Kasei Microdevices Corporation, (AKM), has developed the AK09970, a tri-axis magnetic sensor that is able to detect magnetic signals in X, Y, and, Z directions. The AK09970 supports wide measurement range with high resolution in tri-axis detection and captures magnetic fields in 3-dimensions. With these abilities, it is great device for controlling the direction of security cameras and connected home, (smart home, smart house), smart locks, along with door and window open/close detection.

Samples are available now, with mass-production of the AK099770 in summer 2017.


High Sensitivity Setting / Wide Range Setting

The AK09970N has a high sensitivity setting of 36mT on tri-axis.  It is able to measure a wide range of magnetic field from microtesla to millitesla such as from geomagnetic to a magnet since it has high measurement resolution of 1.1µT/LSB in high sensitivity mode. In addition, wide range setting of 101mT can be achieved via the Z axis.

Low-power Consumption when Battery Life is Critical

The AK09970N can operate using only a few µA, thus consuming a very low current that satisfies a demand of IoT products, (Refer to the Specification Table). It contributes to a long battery life of a product that needs constant acquisition of sensor data to monitor an object’s status.

Magnetic Field Output (Digital)/ Data Ready Alert (DRDY bit)

The AK09970N measures magnetic field on all tri-axis via intermittent drive and outputs the result as digital data, (supporting I2C/SPI communications). It outputs a Data Ready alert to the dedicated register when the measurement data is updated. (0.25/0.5/1/10/20/15/100Hz interval modes or single measurement mode is selectable for intermittent drive options.)

Magnetic Event Interrupt Function

The AK09970N has magnetic event interrupt pins. Two thresholds can be programmed for each axis, (setting the resolution equal to the measuring resolution). When a magnetic field that exceeds the threshold is sent, the AK09970N outputs a “Magnetic Event” interrupt to registers or external output pins. The magnetic event that causes an interrupt output that can be selected freely by setting a register. (Data Ready alert mentioned in 3 can also be output from an interrupt pin). Two interrupt pins are available for magnetic event: the INT pin for push-pull output and the ODIN pin for open-drain output. Therefore, the output format can be selected depending on the customer’s product.


IoT, Security Applications, (Door, Window open/close detection), Monitoring Applications for Factory Equipment, etc.

Main Specifications

Part # AK09970N
Range Setting*
High sensitivity setting Wide range setting
Magnetic sensitivity 1.1µT/LSB 3.1µT/LSB
Measurement range X,Y,Z ±36mT X,Y ±35mT, Z ±101mT
Power Setting*
Low power drive Low noise drive
Noise 15.0µTrms 5.0µTrms
Idd average 0.6µA@1Hz
Output bit 16-bit
Output pin Interrupt pin (CMOS/Open Drain)
Interface SPI/I2C
Power supply 1.7 to 3.6V
16-pin QFN (3.0×3.0×0.75 mm)
Status 2017/07 MP

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