8-Bit Contactless Angle Encoder with ABZ Output and Push Button Function
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The MA820 is an easy-to-use, magnetic, angle encoder designed to replace analogic potentiometers or rotary switches. In contrast to most other MagAlpha parts, the MA8XX series is targeted towards human-machine interface applications rotating at a maximum of 200 rpm. The sensor detects the absolute angular position of a permanent magnet attached to a rotating shaft and outputs incremental ABZ encoder data. The number of pulses per channel for each A or B output is programmable from 1 to 64 via an SPI interface.
Magnet shapes and configurations are very flexible. Typically, the MA820 is used with a diametrically magnetized cylinder of 2 - 8mm in diameter.
The MA820 features programmable magnetic field strength thresholds, which allow for the implementation of a push or pull button function. These are output as two logic signals.
On-chip non-volatile memory provides storage for configuration parameters, including the reference zero angle position, ABZ pulses per channel, and magnetic field detection threshold settings.
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Features & Benefits
- 8-Bit Resolution Absolute Angle Encoder
- Contactless Sensing for Long Life with No Wear
- SPI Serial Interface for Chip Configuration
- Incremental ABZ Encoder Interface with 1-64 Programmable Pulses Per Channel
- Programmable Magnetic Field Strength Detection for Push/Pull Button Detection
- 3.3V, 11mA Supply
- -40 to +125°C Operating Temperature
- Available in a QFN-16 (3mmx3mm) Package
Active Part Numbers:
EVKT820-KNOB-Q-01A Evaluation Kit Rotary Knob Eval Kit for the Angular Sensing and Push-Button Features of MagAlpha Sensors
The EVKT-KNOB kit evaluates the angular sensing and push-button features of the MA820. It is delivered assembled and with a knob and magnet. The sensor is mounted in an end-of-shaft configuration.
It requires the communications kit (EVKT-MACOM) and the Macom App Software (see below) to evaluate MagAlpha functionality and performance with your set-up, such as noise level, refresh rate, power-up time, and magnetic field dependence.
Long Eval Board for MA820
Round Eval Board for MA820
Windows Desktop Application + Drivers for the MagAlpha Communication Kit.