Allegro MicroSystems A31301 3D Linear Hall-Effect Sensors

Allegro MicroSystems A31301 3D Linear Hall-Effect Sensors are flexible, three-axis Hall-effect magnetic sensor ICs capable of measuring the applied flux density in any 1-, 2-, or 3-axes and calculating the angle in up to any two user-defined planes. The A31301 comes in three standard field configurations of ±600G, ±1400G, or ±2000G. These 3mm x 3mm x 0.8mm, 10-contact DFN-packaged (“EJ”) devices are available preconfigured for SPI or I²C interfaces. The magnetic temperature coefficient is customer-programmable, with a factory default trim for neodymium magnets.

The A31301 sensor ICs support two different digital interfaces for ease of use (four-wire SPI or I²C). For high-speed applications, the SPI can operate up to 10MHz, and the I²C interface operates up to 1MHz. The I²C address can be set by external resistors (16x unique addresses) or programmed into EEPROM via I²C (127x unique addresses), allowing multiple devices on the same bus.

Power management of the Allegro MicroSystems A31301 3D Linear Hall-Effect Sensors is highly configurable, allowing for system-level optimization of the supply current and performance. A low leakage sleep current makes the A31301 well-suited for portable, battery-operated applications.

Features

Flexible operating modes
- Can measure input in any 1-, 2-, or 3-axes
- 15-bit angle output from any selectable 2-axes plane
Low RMS angle noise for high system resolution
SPI (up to 10MHz) and I²C (up to 1MHz) interfaces for easy system integration
Ideal for battery-powered, low-voltage applications
- 2.65V to 3.6V analog supply operation
- 1.8V to 3.6V digital supply operation
- Low leakage sleep ICC
- Low-power duty cycle mode options for additional power savings
±600G, ±1400G, or ±2000G field configurations

Flexible multifunction pin for interrupt and sample-start functionality, interrupt pin provides digital output when user-defined threshold has been exceeded
On-chip EEPROM for storing factory and customer-configured settings
Low-profile 3mm x 3mm DFN package for space-constrained applications
-40°C to +85ºC operating temperature range
100% matte-tin leadframe plating
Lead-free

Applications

Camera gimbals
Gamepad joysticks
Motor control feedback

RC autonomous vehicles
Robotic position sensing
Industrial motor control

Specifications

Supply voltage ranges
- 2.65V to 3.6V normal operation
- 2.8V to 3.5V EEPROM programming
0.1µs to 10,000µs supply voltage ramp range
2.51V typical power-on reset
1ms minimum power-on delay time
50ms typical EEPROM write delay time

100x maximum EEPROM write count
-0.5V maximum reverse voltage
±1.7% typical linear sensitivity error
0.12%/°C typical sensitivity temperature coefficient
+65°C/W package thermal resistance

Allegro MicroSystems A31301 3D Linear Hall-Effect Sensors

Features

Applications

Specifications

Functional Block Diagram

Typical Application Circuits

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