General Description:The AMR3108A is a contactless, high-precision,and high-speed magnetic rotary encoder sensor,which integrated with anisotropic magnetoresistance(AMR) sensors and CMOS digital signal processing circuitry.

The AMR3108A senses the single pole-pair magnet rotation above the chip by AMR sensors, collects the rotating magnetic field signal, transmits it to the digital processing unit, calculates the rotation angle and outputs 12-bit absolute position signals. 

The signal period of AMR3108A is 180° rotation angle. Using the reserved inverted switch interface, it can be extended to the detection of 360° rotation angle. 

AMR3108A outputs 12-bit absolute position signal through SPI communication protocol in a 180° rotation period. 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. AMR3108AP also provides inverted UVW output, analog and PWM signals, with rotational speed up to 20,000 RPM.

Features and Benefits:(1)Anisotropic magnetoresistance (AMR) technology;(2)Contactless measurement;(3)Available in SPI, ABZ differential, UVW, Analog and PWM interfaces;(4)12-bit absolute position output in SPI mode;(5)Programmable A/B interpolation factors: ×1 to ×1024;(6)Programmable Z pulse width in 1LSB/2LSB/4LSB/90°;(7)Programmable inverted UVW output resolution in 1 to 16 pole-pair;(8)Programmable analog clamping voltage and PWM frequency;(9)Programmable zero position;(10)Angular repeatability < ±0.1°;(11)Speeds up to 20,000 RPM;(12)Adaptive supply voltage: 3.3 V to 5 V.

Applications:(1)Contactless angular position measurement;(2)Brushless motor position sensing;(3)Rotary speed sensing;(4)Stepper motor.