MA310

Part: MPS MagAlpha Family

Type: Magnetic Angular Position Sensor

Description: The MPS MagAlpha family of magnetic angle position sensors provides instantaneous angle measurement with up to 14-bit resolution, supporting rotation speeds from 0 to over 100kRPM, and operating from a 3.3V supply with 12mA typical consumption.

Operating Conditions:

• Supply voltage: 3.3V (typical)
• Operating temperature: -40 to +125°C
• Rotation speed: 0 to >100kRPM
• Magnetic field range: 15mT to 150mT

Absolute Maximum Ratings:

• Max supply voltage: null
• Max continuous current: null
• Max junction/storage temperature: null

Key Specs:

• Sample rate: up to 1μs
• Latency: 10μs (at 100kRPM)
• Angle resolution: up to 14 bits
• Magnetic field working range: 15mT to 150mT
• Supply current: 12mA (at 3.3V)
• ABZ resolution: up to 1024 PPR
• PWM output frequency: approx. 50kHz (MA850)
• Filter bandwidth: 390 Hz (MA102, MA302)

Features:

• Instantaneous angle sensing
• High resolution up to 14 bits
• Support for shaft rotation speeds from zero to over 100kRPM
• Wide magnetic field range support from 15mT to 150mT
• End- and side-shaft sensor topologies
• Low power consumption: 3.3V, 12mA
• Small form factor: 3x3mm QFN-16 package
• Contactless push-button functionality (MA8xx family)
• Non-volatile memory for configuration
• Digital SPI/SSI, incremental ABZ, PWM, and UVW output options

Applications:

• Rotary Human-Machine-Interface (HMI) applications
• Brushless DC (BLDC) Motor Control
• Motor Commutation
• Motor Commutation with Position Control (Servo Motor)
• General Angle Sensor Applications

Package:

• QFN-16 (3x3mm)

• SPI interface for direct digital angle reading and chip configuration
• ABZ encoder interface with up to 1024 pulses per channel per turn
• UVW commutation interface with pole pair emulation from a simple two-pole magnet
• Magnetic field strength monitoring for diagnostics
• One-time programmable or reprogrammable non-volatile memory for storage of zero position and other programmable chip configuration parameters

Figure 8: MagAlpha MA3xx Block Diagram

MA8xx Family

Rotary knobs are used in a diversity of human-to-machine-interface applications, such as the program selector on a washing machine or the infotainment control in a car. These applications typically use a conventional potentiometer or mechanical rotary applications, which have limited life spans due to mechanical wear and tear or environmental degradation. The use of magnetic angle sensors to implement contactless sensing eliminates both issues to provide a long lifetime solution.

The MagAlpha MA8xx family is a new, simple-touse, digital, magnetic sensor range designed to replace analog potentiometers or rotary switches in such applications. The sensor detects the absolute angular position of a permanent magnet attached to the rotating knob. Typically, a simple diametrically magnetized cylinder with a 3 to 8mm diameter is suitable.

Different options are available, including digital angle output via SPI/SSI bus, incremental ABZ interface, or PWM output.

Programmable threshold magnetic field strength detection is built in to enable implementation of a contactless push or pull button. Detection is performed by reading the device registers or the logic state of the two output signals. In this way, a combined rotary knob with "push or pull to select" functionality can be created.

Figure 2: Block Diagram of MA8xx Family Sensor