High Precision Tri-axis Magnetic Sensor


High Precision Tri-axis Magnetic Sensor




Conventional tri-axis magnetic sensors have been used for position tracking applications. However, there are cases when sufficient performance is not possible due to magnetic field noise. World class ultra-low noise tri-axis sensing from the AK09940 resolves this problem, increasing magnetic position tracking accuracy for AR and VR.

The AK09940 is ideal for magnetic particle testing and metal contamination detection with triaxial magnetic measuring, which measures wet field, small changes, and distortion in magnetic-fields with high precision. In addition, the AK09940 has very low power consumption current suitable for triaxial measurement in wearable and IoT devices with small batteries.

World-Class Ultra-Low Noise

The AK09940 allows for measurement of minute magnetic signals with ultra-low noise (40nT RMS) in the X, Y, and Z axes that are normally drowned out by noise.

Magnetic position tracking used in controllers such as AR and VR devices has the advantage that it can be detected even if the sensor is hidden behind objects. However, due to signal noise on the receiving side, sufficient performance ordinarily may not be obtained in terms of detection range, position accuracy, and response speed. This problem is solved with the ultra-low noise tri-axis magnetic sensor on the receiving side.

Ultra-Low Current Consumption

An ultra-low current consumption of 30μA @ 100Hz makes it ideal for devices using small-capacity batteries.

Small Package

The AK09940 is housed in a small LGA 1.6 x 1.6mm package.


Augmented Reality/Virtual Reality (AR/VR) Devices, Wearable Devices, Magnetic Metal Particle Testers, Magnetic Mapping

Key Features

  • Analog Power Supply VDD: +1.7V to +1.98 [V]
  • Digital Power Supply VID: +1.65V to VDD [V]
  • Interface: I2C & 4-wire SPI
  • Current Consumption (@100Hz ODR) (Power Mode): 30, 60, 100, 200 [ μA (typ.) ]
  • Noise (Power Mode): 70, 60, 50, 40 [ nT-rms (typ.) ]
  • Sensitivity: 10 [nT/LSB]
  • Measurement Range: ±1200 [μT]
  • Output Bit: 18 [bit]
  • Package Size: 1.6 x 1.6 x 0.6 [mm]

Block Diagram


Main Specifications

Tri-axis Magnetic Sensor
  High Precision Tri-axis Magnetic Sensor
Part Number AK09940
Technology TMR
Magnetic Sensitivity [nT/LSB] 10
Measurement Range [μT] ±1200
Measuremet Time [ms] 0.66 / 0.98 / 1.62 / 2.9
Noise (Power Mode) [nT RMS] 70 / 60 / 50 / 40
Output Bit [bit] 18
Max. ODR [Hz] 400
Interface   I2C / 4-wire SPI
Analg Power Supply VDD [V] +1.7 to +1.98
Digital Power Supply VID [V] +1.65 to VDD
Current Consumption@100Hz ODR (Power Mode) [μA] 30 / 60 / 100 / 200
Current Consumption when measuring [mA] 0.93
FIFO   8 steps
Package   11-pin LGA
Package Size [mm] 1.6 × 1.6 × 0.6


AK09940 Datasheet
English [019002992-E-00]
(42 Pages PDF: 732KB)

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