Features

• Hall elements and a signal processing circuit are formed on a substrate (1-chip monolithic)
• Long life and high environment resistance due to contactless rotation angle detection
• Ratiometric analog output
• Angular resolution: 0.36° (10 bits)
• Operating voltage: 2.7 to 3.3V
• Small temperature drift (+/-1° max.)
• Operating temperature range: -30 to 85°C
• Micro 6-pin package, 3.6 x 3.0 x t0.95 mm (3.6 x 4.2 x t0.95 mm including lead wires)

Example of configuration

As shown to the right, the sensor IC can be used simply by locating a radially polarized disc magnet above or below the sensor with a gap.
With such a simple layout, you can create a system detecting absolute angles in a contactless manner.

Main applications

• Compact absolute rotary encoder
• Compact input device (mode selector, control volume)
• Substitute for potentiometer
• Rotary switch

Example of angular error measurement

<Measurement conditions>

• Magnet : Neodymium magnet (Residual magnetic flux
  density: Br = 1250 mT)
  7.0 dia. × t2.0 mm (polarized in radial direction)
  
• Layout : Gap between magnet and sensor package:
  4 mm(This causes 30 mT to be applied to EM-3242.)
  *No eccentricity in magnet rotation.
  Sensor center aligned to rotation center.
• Peripheral circuit : A 0.1 mF bypass capacitor is connected between Vdd and Vss.
  Magnet rotation : Measured in 1° increments up to 360°

Reference materials

• Rotational angle detection
• [Reference] Magnets used with EM-3242
• [Reference] Effect upon angular accuracy when the magnet rotation center is displaced