ams AG - global leader in the design and manufacture of high performance analog ICs (integrated circuits)

AS5172A-B High Resolution Position Sensor

High-Resolution On-Axis Magnetic Angular Position Sensor with PSI5 Output

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The AS5172 is a magnetic position sensor with a high-resolution 12-bit PSI5 output according PSI5 specification Version 1.3 and 2.1.

Based on a Hall sensor technology, this device measures the orthogonal component of the flux density (Bz) over a full-turn rotation and compensates for external stray magnetic fields with a robust architecture based on a 14-bit sensor array and analog front-end (AFE). A sub-range can programmed to achieve the best resolution for the application. To measure the angle, only a simple two-pole magnet rotating over the center of the package is required. The magnet may be placed above or below the device. The absolute angle measurement provides an instant indication of the magnet’s angular position. The AS5172 operates up to a voltage of 16.5V and is protected against overvoltage up to +20V. In addition, the supply pins are protected against reverse polarity up to – 18V.

Key Features

  • 12-bit resolution @90° minimum arc
  • Low output noise, low inherent INL
  • Magnetic stray field immunity
  • Functional safety, diagnostics
  • AEC-Q100 Grade 0 qualified (AS5172B)
    AEC-Q100 Grade 1 qualified (AS5172A)
  • System cost reduction – no PCB and additional components are needed

Key Benefits

  • Resolve small angular excursion with high accuracy
  • Accurate angle measurement
  • Higher durability and lower system costs (no shield needed)
  • Enabler for safety critical applications
  • Suitable for automotive applications
  • SIP Package

Product Facts

Resolution 14-bit / 12-bit
Interfaces PSI5
Output UART-over-PSI5
Max speed [rpm]
Overvoltage protection [ ] Yes
Supply voltage [V] 4.0 to 12.0
Temperature range [°C] AS5172A: -40 to +125
AS5172B: -40 to +150
Package SiP (System in Package) AS5172A
Automotive qualified

Additional Information


The AS5172 is ideal for automotive applications like:

  • Brake and Gas Pedals
  • Throttle Valve and Tumble Flaps
  • Steering Angle Sensors
  • Chassis Ride
  • EGR
  • Fuel-Level Measurement Systems
  • 2/4WD Switch
  • Contactless Potentiometers