EMS22 Datasheet, PDF (2/8 Pages) Bourns Electronic Solutions – Non-Contacting Magnetic Encoder

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.
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.
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 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
Figure 1: Hall Effect Concept
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.