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Bosch Sensortec


Bosch Sensortec BMM350 Magnetometer & BHI360 Smart Sensor

Small package size, large performance capabilities in hearables and more

Experience precise and accurate magnetic field sensing capabilities for a wide range of applications in hearables and more. Bosch Sensortec's BMM350 Magnetometer and BHI360 Smart Sensor System enable seamless integration of advanced sensor functionalities into your designs so that you can go to market with more efficient IoT applications.



The Bosch BMM350 is a very small 16-bit 3-axis, low-current magnetometer that brings the benefits of superior efficiency, high accuracy, and low-noise, into a compact package. This digital sensor is an optimal choice for a wide variety of consumer applications in addition to hearables; such as virtual, augmented, and mixed reality, head orientation, indoor navigation, magnetic compass, high-end gaming, and robotics.

Whether you’re building a new design, or upgrading an existing project, the BMM350 brings features optimized for accuracy, reliability, and flexibility in a single monolithic package solution that integrates with ease into a wide variety of devices.

This device’s versatility, performance, and reliability make it an unmatched choice that customers can easily integrate into a multitude of existing and upcoming devices such as smartphones, wearables, hearables, vehicles, drones, and GPS modules.


  • Package dimensions: 1.28 x 1.28 x 0.5 mm³ wafer level chip scale package (WLCSP)
  • Operating range: -40 °C to 85 °C
  • Supply voltage:
    • VDDIO: 1.72 V … 3.6 V
    • VDD: 1.72 V … 1.98 V
  • Typical output noise rms 3dB BW = ODR/2:
    • ± 190 nTrms (x,y axis)
    • ± 450 nT rms (z axis)
  • Sensitivity Temperature Drift (typ.): ± -0.010 %/K
  • Average typical current consumption: 200 µA @ 100 Hz in normal mode
  • Magnetic field range, all axes: ± 2000 µT
  • Zero-field offset drift after soldering (typ.): ± 25 µT
  • Sensitivity/gain error after soldering (typ.): ± 1 %
  • Interface: I2C and I3C
  • TCO error (typ.): ± 200 nT/K
  • Maximum sampling rate: 400 Hz (normal mode)


  • Head orientation for 3D audio
  • Indoor navigation
  • Reduced motion sickness in AR/VR
  • Positioning and speed detection



BHI360 is a programmable IMU-based sensor system combining a gyroscope with an accelerometer that enables full customization. The integrated sensor fusion library enables 3D audio with head orientation for personalized sound experiences as well as simple gesture recognition. It can be used in wearables and hearables, smartphones and tablets, smart devices and more.

The sensor is provided in a compact 20-pin LGA package measuring 2.5 x 3 x 0.95 mm³. This means it is 50% smaller than its previous generation, and that it is the smartest programmable IMU sensor in the market. BHI360 is a highly integrated, ultra-low power, smart 6-axis IMU consisting of a 32-bit programmable microcontroller. In addition, it consists of an ultra-low power microprocessor, including pre-installed sensor fusion software and algorithms in a single package.


Hardware features

  • ARC EM4 CPU (up to 3.6 CoreMark/MHz)
  • Floating Point Unit (FPU)
  • Memory Protection Unit (MPU)
  • 4-Channel micro-DMA Controller
  • ARCv2 16/32-bit instruction set

Low Power CPU

  • Optimized for accelerometer based always-on algorithms


  • 256 kB on-chip SRAM
  • 144 kB on-chip ROM preloaded with software

Software features

  • Open sensor platform
  • Integrated event-driven software framework
  • Integrated BSX sensor fusion software library
  • Support for high-performance mode as well as low-power modes
  • Integrated head orientation algorithm
  • Optimized algorithms running on ultra-low power core
  • Powerful SDK


  • Wrist wearables (smartwatches, fitness bands, smart hybrid watches)
  • Head mounted devices (headsets, truly wireless in-ear devices, smart sunglasses)
  • Smartphones and other mobile communication devices
  • AR/VR/MR headset and controller devices