Bourns® Model EMS22 Product Description

Bourns® Model EMS22 is a non-contacting rotary

magnetic encoder with a Hall Effect application-

specific standard product (ASSP) capable of

producing four distinct output waveforms. These

waveforms include 2-bit quadrature up to 256 PPR*,

Step/Direction up to 512 PPR, Pulse-Width

Modulated (PWM) output with 1024 positions, and

Absolute with 1024 positions.

Model EMS22 is available in both a 3.3 and 5.0 Vdc

supply voltage and is offered in two different

versions. This product has the capability of rotating

up to 10,000 RPM while maintaining code accuracy,

making it suitable for MMI applications such as

industrial automation. This performance is achieved

by utilizing dual ball bearings in the construction of

the device, resulting in extended rotational life up to

100,000,000 shaft revolutions (beyond 100,000,000

shaft revolutions in some configurations).

The EMS22 non-contacting encoder is ideal for

use in harsh environments where extreme levels of

temperature, moisture and particles are present. The

outstanding performance of this device is attributed

to the non-contacting technology and superior

performance of the austriamicrosystems® AS5040

Hall Effect ASSP. In addition, this product is sealed

to IP** 65 with an optional upgrade to IP 67.

The EMS22 is RoHS compliant in accordance with

Directive 2002/95/EC of the European Parliament

and Council of 27 Jan 2003 on the restriction of the

use of certain hazardous substances in electrical and

electronic equipment.

This model is produced and assembled utilizing

state-of-the art production equipment along with

lean principles to provide our customers with a high

performance product at a competitive price.

* Pulses per Revolution

** Ingression Protection

What is Hall Effect?

Discovered by Edwin Hall in 1879, Hall Effect refers

to the potential difference on opposite sides of a

bar-shaped conducting or semi-conducting material

(Hall element). This potential difference (voltage) is

produced by a magnetic field applied perpendicular

to the Hall element through which an electric current

flows. Figure 1 is provided to clarify this concept by

illustration. Figure 2 demonstrates two different states

of the AS5040 ASSP as the magnet rotates in close

proximity to the ASSP.

Figure 1: Hall Effect Concept