AS5134 High Speed Magnetic Rotary Encoder

By ams 132

AS5134 High Speed Magnetic Rotary Encoder

ams' AS5134 is a contactless magnetic rotary encoder for accurate angular measurement over a full turn of 360°. It is a system-on-chip combining integrated Hall elements, analog front end, and digital signal processing in a single device.

To measure the angle, only a simple 2-pole magnet rotating over the center of the chip is required. The absolute angle measurement provides instant indication of the magnet's angular position with a resolution of 8.5-bit = 360 positions per revolution. This digital data is available as a serial bit stream and as a PWM signal.

In addition to the angle information, the strength of the magnetic field is also available as a 6-bit code. Data transmission can be configured for 1-wire (PWM), 2-wires (DCLK, DIO), or 3-wires (DCLK, DIO, CS).

A software programmable (OTP) zero position simplifies assembly, as the zero position of the magnet does not need to be mechanically aligned. A power down mode together with fast startup- and measurement-cycles allows for very low average power consumption.

View Diagram

Features and Benefits
  • Direct measurement of magnetic field strength allows exact determination of vertical magnet distance
  • Incremental outputs ABI quadrature: 90 ppr, step direction: 180 ppr, fixed pulse width 360 ppr
  • BLDC motor commutations outputs UVW, selectable for 1- to 6-pole pairs
  • Daisy-chain mode for cascading of multiple sensors
  • User programmable zero position, sensitivity
  • 9-bit multi-turn counter
  • 360° contactless angular position encoding
  • 2-digital 360 step (8.5-bit) absolute outputs:
    • Serial interface
    • Pulse width modulated (PWM) output
  • Low power mode with fast startup
  • Wide magnetic field input range: 20 mT to 80 mT
  • Wide temperature range: -40°C to +140°C
  • Small Pb-free package: SSOP-20
  • High speed: up to 82,000 rpm
  • Contactless rotary position sensing
  • Rotary switches (human machine interface)
  • AC/DC motor position control
  • Brushless DC motor position control

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