ALS31313: Automotive Grade, 3-D Magnetic Linear Hall-Effect Sensor with I2C Output and Advanced Low Power Management

The ALS31313 3D magnetic sensor 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 ALS31313 is available preconfigured 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 preprogrammed to support the drift profile of neodymium magnets.

The ALS31313 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 ALS31313 also includes 78 bits of user EEPROM.

Power management of the ALS31313 is highly configurable, allowing for system-level optimization of supply current and performance. Sleep mode consumes just 14 nA (typical), making the ALS31313 well suited for portable, battery-operated applications.

The ALS31313 is supplied in an 8-pin TSSOP. The package is lead (Pb) free with 100% matte-tin leadframe plating.

• AEC-Q100 automotive qualification pending
• Senses magnetic fields in X, Y, and Z axes
• Z-axis sensing of “crouch” or push button motion
• Capable of operating with back-bias magnets
• Ideal for battery-powered, low-voltage applications
  • 2.65 to 3.5 V single supply operation
  • 1 MHz I2C compatibility down to 1.8 V
  • 14 nA (typ) Sleep I_CC
  • 12 μA to 2 mA I_CC(typ) in low-power duty cycle mode
• Industry standard I²C接口,便于系统集成
  • Up to 1 MHz (Fast Mode+) I²C communication
  • 16 selectable addresses via external resistor divider
  • 127 available address configurable via EEPROM
• On-chip EEPROM
  • Stores factory- and user-configured settings
  • 78 bits of user EEPROM for additional storage
  • On-chip charge pump for easy programming
• Flexible 12-bit ADC with 10-bit ENOB (Effective Number of Bits)
• Single-Ended Mode (X, Y, and Z axes): enables one to three axes
• Differential Mode (X and Y axes): enables slide-by linear sensing
• Common Mode (X and Y axes): enables joystick operation
• 1% (typ)准确factory-trimmed opti的敏感性ons (±500 G, ±1000 G, and ±2000 G full-scale input)
• Integrated temperature sensor
• Wide ambient temperature range: –40°C to 125°C