MA782 Low-Power Angle Sensor QFN-14

MA782 Low-Power Angle Sensor QFN-14

The MA782 detects the absolute angular position of a permanent magnet, such as a diametrically magnetized cylinder on a rotating shaft.

Key Specifications

Features

• 8-Bit to 12-Bit Resolution Absolute Contactless Angle Encoder
• <0.5µA Current Consumption in Idle Mode
• 10mA Current Consumption in Active Mode
• Angle Detection Interrupt to Wake the System
• Magnetic Field Strength Alarm
• Supports On-Axis and Off-Axis Operation
• Serial Peripheral Interface (SPI)
• 3.3V Supply
• -40°C to +125°C Operating Temperature
• Available in a QFN-14 (2mmx2mm) Package

Typical Application Circuit

Applications

• Portable Devices
• Tablet Foldable Displays
• Mobile Flip Phones
• E-Bike Shifters and Throttle Control
• Smart Door Locks

Design Notes

• Mechanical tolerance between the magnet and the sensing element translates directly into angle error; budget it before choosing the resolution.
• Match the output interface (SPI, ABZ, PWM or analog) to the MCU timing, including the latency the control loop can tolerate.
• Offset and sensitivity drift over temperature are systematic — a single-point calibration at room temperature will not hold over the operating range.
• Differential or digital outputs survive electrically noisy motor environments far better than single-ended analog ones.

Common Questions