3D magnetometer for cost-effective applications
MLX90391
The MLX90391 is a low-power 3D digital magnetometer in TSOT23-6L offering selectable range configurations up to ±520 mT for cost-sensitive anti-tamper smart metering and contactless HMI controls.
Top features
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Selectable magnetic range ±65 mT, ±130 mT, ±260 mT & ±520 mT
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Wake-up on change / Interrupt modes
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Power Down mode of 5 nA
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16-bit Digital Output for magnetic and temperature data
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Data Ready output for μC synchronization
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Built-in chip temperature compensation
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Runtime selectable modes (on-the-fly)
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Integrated configurable digital filter
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Individually selectable magnetic axes
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I2C compatible with 0.1 MHz, 0.4 MHz & 1.0 MHz
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External synchronized measurement via I2C
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Two selectable I2C slave addresses in one device
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Wide supply voltage from 1.7 V to 3.6 V
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Ambient temperature range from -40 °C to 125 °C
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TSOT23-6L (SE) package: RoHS, Green and Halogen free compliant
3D magnetometer for cost-effective applications - MLX90391
Product description
The MLX90391 is a 3-axis magnetometer specifically designed for micropower cost-sensitive applications. It measures magnetic fields along the X, Y, and Z axes using a combination of vertical and horizontal Hall-effect technology, and outputs 16-bit magnetic and IC temperature data over an I²C interface.
Featuring four user-selectable magnetic range options (±65 mT, ±130 mT, ±260 mT, and ±520 mT), the device allows engineers to use the same IC for high-resolution position measurement or for robust external-magnet anti-tamper protection up to 500 mT in smart utility meters. Its standard TSOT23-6L package and familiar I²C interface enable a direct drop-in replacement, simplifying upgrades without PCB redesigns.
The chip integrates Wake-up on Change (WOC) logic with Static Delta and Dynamic Delta modes, allowing the host system to remain in deep sleep while the IC monitors magnetic field variations. Operating from 1.7 V to 3.6 V across -40C to 125C, it features an ultra-low 5 nA power-down mode for prolonged battery operation.
The MLX90391 offers synchronization options via an external trigger pin or an I2C command. Two I2C addresses (per device) are available by swapping SDA and INTB pins. Furthermore, it is available in two versions to offer more variety in I2C address options. In total, four pre-programmed MLX90391 can be placed on a single I2C bus.
Application examples:
- Anti-tampering – E-meters, doors & windows
- White goods – Smart knob & liquid levels
- Battery-powered tools – Hairdryer & drill trigger
- Smart home – HMI thermostat & electronic lock
- Wearables – Smart watch digital crown & bezel
- Industrial – Linear & pneumatic actuators
- Gaming – Joystick, D-pads & trigger buttons
- E-bikes – Forks and gear position
- PC peripheral – Mouse roller
Features and benefits
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Selectable magnetic range ±65 mT, ±130 mT, ±260 mT & ±520 mT
-
Wake-up on change / Interrupt modes
-
Power Down mode of 5 nA
-
16-bit Digital Output for magnetic and temperature data
-
Data Ready output for μC synchronization
-
Built-in chip temperature compensation
-
Runtime selectable modes (on-the-fly)
-
Integrated configurable digital filter
-
Individually selectable magnetic axes
-
I2C compatible with 0.1 MHz, 0.4 MHz & 1.0 MHz
-
External synchronized measurement via I2C
-
Two selectable I2C slave addresses in one device
-
Wide supply voltage from 1.7 V to 3.6 V
-
Ambient temperature range from -40 °C to 125 °C
-
TSOT23-6L (SE) package: RoHS, Green and Halogen free compliant
Documents and tools
Datasheet(s)
Product flyer(s)
Selection guide(s)
Environmental
IC handling and assembly
Magnet suppliers
Related tech talks
Videos
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