Monolithic Power Systems Inc High-Accuracy, High-Bandwidth, Configurable, TMR-Based Digital Magnetic Angle Sensor

The MA600A is a precision, high-bandwidth magnetic angle sensor that detects the absolute angular position of a permanent magnet, typically a diametrically magnetized cylinder on a rotating shaft. With its integrated precision tunnel magnetoresistance (TMR) sensor, the MA600A achieves high bandwidth and high accuracy (INL), making it an ideal solution for position control and robotics.

The MA600A supports a wide range of magnetic field strengths and mounting configurations: end-of-shaft (on-axis) and side-shaft (off-axis).

On-chip non-volatile memory (NVM) provides storage for configuration parameters, including the reference zero-angle position, as well as ABZ, UVW, and pulse-width modulation (PWM) settings.

The MA600A is factory-calibrated to achieve an error (INL) below 0.6° across its operating temperature range. Furthermore, a final system calibration is available through a 32-point, user-configurable correction table. The resulting error (INL) after user calibration can be smaller than 0.1°. 

Communication with the MA600A can be accomplished via a serial peripheral interface (SPI) or synchronous serial interface (SSI).

The MA600A supports a daisy-chain configuration. It allows for the sequential SPI angle readout of multiple sensors, which minimizes the number of I/O pins used by the controller device.

The MA600A is available in a small QFN-16 (3mmx3mm) package.

Features

• <0.6° Error (INL)
• <0.1° Error (INL) after User Calibration with On-Chip 32-Point Lookup Table
• Configurable 12-Bit to 15-Bit Absolute Angle Encoder
• High Bandwidth (e.g. 12kHz at 12.5-Bit Resolution)
• No Latency
• Wide 10mT to 100mT Magnetic Field Range
• Serial Peripheral Interface (SPI) for Digital Angle Readout and Chip Configuration
• SPI Angle Readout in Daisy Chain Configuration Supported
• Synchronous Serial Interface (SSI) for Digital Angle Readout
• Incremental ABZ Quadrature Encoder Interface with Configurable Pulses per Turn (1 to 4096)
• Incremental UVW Encoder Output
• Pulse-Width Modulation (PWM) Absolute Output
• Multi-Turn or Speed Output Option
• 3.3V Supply
• 7.5mA Quiescent Current (I_AVDD + I_DVDD)
• -40°C to +125°C Operating Temperature
• Available in a Small QFN-16 (3mmx3mm) Package

Applications

• Motor Control
• Robotics