1. Basic Description

The BMM350 is a 3-axis magnetic sensor which operates in automatic mode or triggered mode. The magnetic-to-digital conversion technology is based on TMR (tunnel magneto resistance)

The BMM350 is designed to meet all requirements for high performance consumer applications such as magnetic compass, virtual, augmented and mixed reality applications and high-end gaming, platform stabilization applications such as image stabilization, or indoor navigation and dead-reckoning, for example in robotics applications.

Evaluation circuitry converts the output of the magnetic transducer sensing structures, developed, produced and tested in BOSCH facilities. The corresponding chip-sets are packed into one single WLCSP 1.28mm x 1.28mm x 0.5mm housing. For optimum system integration the BMM350 is fitted with digital interfaces (I2C, I3C), offering a wide VDDIO voltage range from 1.72V to 3.6V. To provide maximum performance and reliability each device is tested and ready-to-use calibrated.

The BMM350 has an excellent temperature behaviour with an outstanding low temperature coefficients of the offset (TCO) and of the sensitivity (TCS).

An API is provided for quick integration into the target system.

Key features

Three-axis magnetic field sensor

• Ultra-Small package Wafer Level Chip Scale Package (9 pins, 0.4mm ball pitch) footprint 1.28 x 1.28 mm2, height 0.5 mm

• Digital interface I2C, I3C, 1 interrupt pin, 1 pin for I2C/I3C (legacy) address definition

• Low voltage operation VDD supply voltage range: 1.72V to 1.98V VDDIO interface voltage range: 1.72V to 3.6V

• Flexible functionality Magnetic field range typical: ±2000μT (x, y-axis), ±2000μT (z-axis)

Magnetic field resolution of ~0.1μT

• On-chip interrupt controller Interrupt-signal generation for new data

• Ultra-low power Low current consumption (typ. 200μA @ 100 Hz in regular power preset), short wake-up time

• Normal and forced mode periodic operation (normal mode) and triggered operation (forced mode)

• Temperature range -40 °C … +85 °C

• RoHS compliant, halogen-free

Typical applications

• Magnetic heading information

• Tilt-compensated electronic compass for map rotation, navigation and augmented reality

• Gyroscope calibration in 9-DoF applications for mobile devices

• In-door navigation, e.g. step counting in combination with accelerometer

• Gaming (AR/VR)