MA704 Contactless Angle Sensor QFN-16

MA704 Contactless Angle Sensor QFN-16

The MA704 detects the absolute angular position of a permanent magnet, typically a diametrically magnetized cylinder on a rotating shaft.

Key Specifications

Features

• 10-Bit Resolution Absolute Angle Encoder
• Contactless Sensing for Long Life
• SPI Serial Interface for Digital Angle Readout and Chip Configuration
• Incremental 8-Bit ABZ Quadrature Encoder Interface with Programmable Pulses Per Turn from 1-64
• PWM Output 10-Bit
• Programmable Magnetic Field Strength Detection for Diagnostic Checks
• 3.3V, 12 mA Supply
• -40°C to +125°C Operating Temperature
• Available in a QFN-16 (3mmx3mm) Package

Typical Application Circuit

Applications

• General Purpose Angle Measurement
• Angle Encoders
• Automotive Angle or Speed Sensors

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