Tri-axis Magnetic Smart Switch

Tri-axis Magnetic Smart Switch




Wide Measurement Range & High Resolution

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. (0.25/0.5/1/10/20/50/100Hz 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.

Block Diagram


Main Specifications

Tri-axis Magnetic Sensor
  Tri-axis Magnetic Smart Switch with Digital Output
Part Number AK09970N
Technology Si Hall
Power supply (VDD) [V] 1.7 to 3.6
Magnetic sensitivity [μT/LSB] 1.1
Measurement range [mT] X,Y,Z ±36
Measuremet time [ms] 0.23
Current consumption @100Hz ODR (Low power drive) [μA] 27
Current consumption when measuring [mA] 1.5
Output pin   Interrupt pin (CMOS / Open Drain)
Max. ODR [Hz] 2000
Interface   SPI / I2C
Package   16-pin QFN
Package Size [mm] 3.0 × 3.0 × 0.75

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