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