Description

The TMR3105A 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 TMR3105A 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. TMR3105A outputs 12-bit absolute position signal through SPI communication protocol. At the same time, it is able to output A/B phase programmable incremental position signal with 1 to 1024 pulse and programmable zero-point (Z phase) signal. TMR3105A also provides inverted UVW output, analog and PWM signals, with rotational speed up to 20,000 RPM.

Features and Benefits

••Tunneling magnetoresistance (TMR) technology

••Contactless measurement

••Available in SPI, ABZ differential, UVW, Analog and PWM interfaces

••12-bit absolute position output in SPI mode

••Programmable A/B interpolation factors: ×1 to ×1024

••Programmable Z pulse width in 1LSB/2LSB/4LSB/180°

••Programmable inverted UVW output resolution in 1 to 16 pole-pair

••Programmable analog clamping voltage and PWM frequency

••Programmable zero position

••Angular repeatability < ±0.2°

••Speeds up to 20,000 RPM

••Adaptive supply voltage: 3.3 V to 5 V

Applications

••Contactless angular position measurement

••Brushless motor position sensing

••Rotary speed sensing

••Robotics