TMR3111 23-bit TMR Magnetic Rotary Encoder
The TMR3111 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 TMR3111 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 TMR3111 supports 3-wire and 4-wire SPI working modes, allowing the client MCU to read 23-bit absolute position information through the SPI protocol. Additionally, the chip also provides a 12-bit resolution PWM output interface, with the PWM frequency configurable in four levels according to customer requirements.

It is able to output A/B phase programmable incremental position signal with 1 to 4096 pulse and programmable zero-point (Z phase) signal. TMR3111 also provides inverted UVW output, analog and PWM signals, with rotational speed up to 40,000 RPM.

The TMR3111 can self-calibrate to compensate non-linearities caused by imperfect installation.

Features and Benefits

• Tunneling magnetoresistance (TMR) technology    
• Supply voltage: 3 V to 5 V
• Available in SPI, ABZ and PWM interfaces    
• Supply current: 10 mA (typical)
• Programmable A/B/Z interpolation factors from ×1 to ×4096    
• Speeds up to 40,000 RPM
• Integrated automatic gain calibration function    
• Angular repeatability < ±0.05°
• Integrated EEPROM rewritable over 1000 cycles    
• On and off axis measurements
• Supports 0° to 360° absolute angle detection    
• Angular output delay < 2 μs
• RoHS and REACH compliant    

Applications

• Contactless angular position measurement    
• Brushless motor position sensing
• Rotary speed sensing    
• Close loop stepper system
• Servo encoder

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MultiDimension Technology(MDT®) is a leading supplier of magnetic sensors specializing in Tunneling Magnetoresistance (TMR) technology. The company offers high-quality TMR magnetic sensors and system solutions for industrial and consumer sensor applications. MDT has corporate headquarters in Zhangjiagang Free Trade Zone, Jiangsu, China, with branch offices located in San Jose, CA, USA and Shanghai, China. MDT owns a unique portfolio of intellectual properties and state-of-the-art manufacturing facilities that support volume production of high-performance, low-power and low-cost sensors to satisfy the most demanding customer needs. Led by its founding team of elite experts and veterans in magnetic sensor technology and engineering services, MDT is committed to creating added values to its customers and ensuring their success.