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Allegro MicroSystems ALS31300 3D Linear Hall-Effect Sensors offer 3DMAG™ technology and provide a 12-bit digital value corresponding to the magnetic field measured in each X, Y, and Z axes. The devices are preconfigured for 3D sensing applications for head-on linear motion, slide-by position sensing, and rotation angle measurements. The ALS31300 offers a joystick mode, including a low gain option for the Z-axis channel. This feature employs a back-bias magnet to permit return-to-zero force instead of traditional spring-based solutions. Three different factory-programmed sensitivity ranges are available in ±500G, ±1000G, and ±2000G.
The I2C address is set either by external resistors (16 unique addresses) or programmed into EEPROM via I2C (127 unique addresses), resulting in multiple devices on the same bus. Furthermore, the ALS31300 includes 78 bits of user EEPROM.
The ALS31300 enables robust joystick design, replacing potentiometer-based joystick modules. Magnetic joysticks can be low-profile, facilitating low system power for battery-powered applications and support joystick wake-on motion. With the addition of a back-bias magnet, the ALS31300 allows magnetic return to zero or removable joysticks.
Power management of the ALS31300 is highly configurable, allowing for system-level optimization of supply current and performance. Sleep mode consumes just 14nA (typical), making the ALS31300 appropriate for portable, battery-operated applications.
The ALS31300 is housed in a small footprint 3mm × 3mm × 0.8mm, 10-contact DFN package (“EJ”) that is lead (Pb) free, with 100% matte-tin lead-frame plating.
