The Allegro Microsystems ALS31300 three-axis linear Hall effect sensor IC provides 12-bit digital output words that are proportional to the strength of the field present in each of the X, Y, and Z axes. The quiescent output value (zero magnetic field applied) is at mid-scale. The ALS31300 is available pre-configured for use in joystick mode that includes crouch capability or single-ended X, Y, and Z mode. Single-ended configured devices are suitable for 3D linear sensing or 2D angle sensing applications and are available with three different factory-programmed sensitivity operating ranges: ±500 G, ±1000 G, and ±2000 G. The sensitivity temperature coefficient is pre-programmed to support the drift profile of neodymium magnets.

The ALS31300 incorporates I²C interface for easy integration into a wide variety of applications. The I²C address can be set either by external resistors (16 unique addresses) or programmed into EEPROM via I²C (127 unique addresses), allowing for multiple devices on the same bus. The ALS31300 also includes 78 bits of user EEPROM.

The ALS31300 enables robust joystick design, replacing potentiometer based joystick modules. Magnetic joysticks can be low profile and enable low system power for battery-powered applications, and support joystick wake-on motion. With the addition of a back-bias magnet, the ALS31300 enables 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 14 nA (typical), making the ALS31300 well-suited for portable, battery-operated applications. The ALS31300 is supplied in a 3 mm × 3 mm × 0.8 mm, 10-contact DFN package (“EJ”). This small footprint package is lead (Pb) free, with 100% matte-tin lead-frame plating.