Description

The TMR3109 is a contactless, high-precision, and

high-speed magnetic rotary encoder sensor, which

integrated with tunneling magnetoresistance (TMR)

sensors and CMOS digital signal processing circuitry.

The TMR3109 senses the single pole-pair magnet

rotation above the chip by TMR sensors, collects the

rotating magnetic field signal, transmits it to the digital

processing unit, and calculates the rotation angle.

The TMR3109 supports 3-wire and 4-wire SPI working

modes, allowing the client MCU to read 23-bit absolute

position information through the SPI protocol.

Auto-calibration is available for the TMR3109 to

compensate non-linearities caused by imperfect

installation.

Features and Benefits

• Tunneling magnetoresistance (TMR) technology

• Supply voltage: 3.3 V to 5 V

• Supply current: 10 mA (typical)

• Supports 0° to 360° absolute angle detection

• On and off axis measurements

• Available in SPI interface

• Angular output delay < 2 μs

• Angular repeatability < ±0.05°

• Speeds up to 40,000 RPM

• Auto-calibration function

• Integrated automatic gain calibration function

• RoHS & REACH compliant

Applications

• Contactless angular position measurement

• Brushless motor position sensing

• Rotary speed sensing

• Close loop stepper system

• Servo encoder