Allegro MicroSystems A31331 3D Linear Hall-Effect Sensor
Allegro MicroSystems A31331 3D Linear Hall-Effect Sensor is a flexible magnetic sensor that can measure the applied flux density in any one, two, or three axes and calculate the angle in up to two user-defined planes. The A31331 comes in a standard field configuration of ±600 G. Additionally, the device is preconfigured for SPI or I2C. The magnetic temperature coefficient is customer-programmable to support various magnet properties.
The A31331 supports two digital interfaces: four-wire SPI or I2C for ease of use. The SPI can operate at up to 10 MHz for high-speed applications, and the I2C interface can operate at up to 1 MHz. The I2C address can be set by external resistors (16 unique addresses) or programmed into EEPROM via I2C (127 unique addresses), allowing multiple devices on the same bus.
The A31331's highly configurable power management allows system-level optimization of supply current and performance. Its low-leakage sleep current makes it well-suited for portable, battery-operated applications. The Allegro MicroSystems A31331 is supplied in an eight-pin thin-shrink small-outline package (TSSOP). The package is lead-free (Pb) with 100% matte tin lead frame plating.
Features
- Flexible operating modes
- Can measure input in any one, two, or three axes
- 15-bit angle output from any selectable two-axis plane
- Low root-mean-square (RMS) angle noise for high system resolution
- SPI and I2C interfaces for easy system integration
- Up to 10 MHz serial peripheral interface (SPI)
- Up to 1 MHz inter-integrated circuit (I2C)
- Ideal for battery-powered, low-voltage applications
- 2.65 to 3.6 V analog supply operation
- 1.8 to 3.6 V digital supply operation
- Low-leakage sleep ICC
- Low-power duty cycle mode options for additional power savings
- Flexible multifunction pin for interrupt and sample-start functionality
- The interrupt pin provides a digital output when the user-defined threshold is exceeded
- On-chip EEPROM for storing factory and customer-configured settings
- –40°C to 125ºC operation
- AEC-Q100, Grade 1 automotive qualified
Applications
- Valve position
- Shifter
- Human-machine interface (HMI)
Functional Block Diagram
