Allegro MicroSystems A31015 Linear Hall-Effect Sensor
Allegro MicroSystems A31015 Linear Hall-Effect Sensor is a nanopower, ratiometric linear Hall-effect sensor IC designed specifically to maximize battery life in portable and space-constrained applications. Unlike traditional linear sensors that consume constant power, the A31015 features a dedicated active-high enable (EN) pin, allowing system microcontrollers to duty-cycle the A31015. This power-gating capability reduces average power consumption to less than 1µW (at 10Hz cycling), while the ultra-low-leakage sleep mode consumes less than 1nA.
When enabled, the A31015 wakes up in under 13µs, providing a high-accuracy analog voltage output proportional to the magnetic field. In sleep mode, the output transitions to a high-impedance state, facilitating easy interface with shared ADC lines or multiplexed sensor arrays.
Packaged in a tiny 1.54mm2 DFN-4 (suffix EW), the Allegro MicroSystems A31015 delivers reliable magnetic sensing for precision position and travel detection without compromising the thermal or power budget of next-generation products.
Features
- Wide 1.6V to 5.5V operating supply range
- Wide -40°C to +125°C temperature range
- Small DFN-4 package with 1.54mm2 area, 0.5mm pitch, and < 0.5mm height
- < 1µW average power with 10Hz duty cycling
- < 13µs enable time
- High-impedance output in sleep mode
- < 1nA maximum sleep mode supply current
- Many orderable configurations to customize the IC for optimal system performance
- Wide range of sensitivity options
- Polarity available with bipolar, unipolar south, or unipolar north options
- 0%/°C to 0.2%/°C temperature coefficient range
Applications
- Gaming
- Internet of Things (IoT) and smart homes
- Industrial and utility metering
- Medical and personal care
Functional Block Diagram
