S2 Optical Shaft Encoder

S2 Features

  • 2-channel quadrature, TTL square wave outputs
  • 3rd channel index option
  • 64 to 10,000 CPR (256 to 40,000 PPR)
  • Ball-bearing option tracks to 10,000 RPM
  • Wide operating temperature
  • Single +5V supply

See more info below

Configure the S2

S2 Product Description

Restriction of Hazardous Substances

The S2 series high resolution optical shaft encoder is a non-contacting rotary to digital converter. Useful for position feedback or manual interface, the encoder converts real-time shaft angle, speed, and direction into TTL-compatible quadrature outputs with or without index. It operates from a single +5VDC supply.

The S2 is our first generation ball-bearing optical shaft encoder and is available for those customers who have designed it into their products; however, the S6 is recommended for new designs in place of the S2.

The S2 is designed to drive cables up to 10 feet long. For longer cable lengths, adding a PC4/PC5 differential line driver is recommended.

Three shaft torque versions are available:

  • The default torque version has a sleeve bushing designed to provide torque and feel ideal for front panel human interface applications.
  • The ball-bearing version uses miniature precision ball bearings that are suitable for high-speed and ultra-low torque applications.
  • The light static drag option has a sleeve bushing that does not intentionally add torque for low RPM applications where a small amount of torque is acceptable.

Connection to the S2 series encoder is made through a 5-pin standard connector. The mating connectors are available from US Digital with several cable options and lengths.

Product Specifications

ENVIRONMENTAL

PARAMETER VALUE UNITS
Operating Temperature, CPR < 2000 -40 to 100 C
Operating Temperature, CPR ≥ 2000 -25 to 100 C
Electrostatic Discharge, IEC 61000-4-2 ± 4 kV
Vibration (10Hz to 2kHz, sinusoidal) 20 G
Shock (6 milliseconds, half-sine) 75 G

MECHANICAL

PARAMETER SLEEVE BUSHING BALL BEARING
Max. Acceleration 250000 rad/sec² 250000 rad/sec²
Max. Shaft Speed (mechanical) 100 rpm (1) 10000 rpm (1)
Max. Shaft Torque 0.5 ±0.2 in-oz
0.3 in-oz (N-option)		 0.05 in-oz
Max. Shaft Loading 2 lbs. dynamic
20 lbs. static		 1 lb.
Bearing Life > 1000000 revolutions L10 = (19.3/Fr)³ *
Where L10 = bearing life in millions of revs, and
Fr = radial shaft loading in pounds
Weight 1.28 oz. 1.28 oz.
Max. Shaft Runout 0.0015 in. T.I.R. 0.0015 in. T.I.R.
Max. Panel Nut Tightening Torque 20 in-lbs 20 in-lbs
Technical Bulletin TB1001 - Shaft and Bore Tolerances Download

* Only valid with negligible axial shaft loading.

(1) The maximum speed due to electrical considerations is dependent on the CPR. See the EM1 and EM2 product pages.

PHASE RELATIONSHIP

B leads A for clockwise shaft rotation, and A leads B for counterclockwise rotation when viewed from the shaft side of the encoder.

ELECTRICAL

  • Specifications apply over the entire operating temperature range.
  • Typical values are specified at Vcc = 5.0Vdc and 25°C.
  • For complete details, see the EM1 and EM2 product pages.
PARAMETER MIN. TYP. MAX. UNITS CONDITIONS
Supply Voltage 4.5  5.0 5.5 V  
Supply Current   27 33 mA CPR < 1000, no load 
  54 62 mA CPR ≥ 1000 and < 3600, no load
  72 85 mA CPR ≥ 3600, no load
Low-level Output     0.5 V IOL = 8mA max., CPR < 3600
    0.5 mA IOL = 5mA max., CPR ≥ 3600
  0.05   mA no load, CPR < 3600
  0.25   mA no load, CPR ≥ 3600
High-level Output 2.0     V IOH = -8mA max., CPR < 3600
2.0     V IOH = -5mA max., CPR ≥ 3600
  4.8   V no load, CPR < 3600
  3.5   V no load, CPR ≥ 3600
Output Current Per Channel -8   8 mA CPR < 3600
-5   5 mA CPR ≥ 3600
Output Rise Time   110   nS CPR < 3600
  50   nS CPR ≥ 3600
Output Fall Time   35   nS CPR < 3600
  50   nS CPR ≥ 3600

PIN-OUT

PIN DESCRIPTION
1 Ground
2 Index
3 A channel
4 +5VDC power
5 B channel

Note: 5-pin single-ended mating connector is CON-C5 or CON-LC5

PRODUCT CHANGE NOTIFICATIONS

Title Date Description Download
S2 Housing Update – PCN 6935 1/13/2020 US Digital is implementing a redesign of the plastic housing components. The design changes are primarily an alteration of surface drafts and orientation of the housing components relative to each other. The new housing is dimensionally equivalent without any impact to form, fit or function within the envelope of the previous design. Download
Laser Marking - PCN 5253 6/17/2015 As part of our ongoing continuous improvement efforts, US Digital is changing the labeling/marking method for our E3, E6, H3, H6, S1, S2 and S6 products. Download
EM1 & EM2 Update - PCN 4199 1/14/2014 Based on our continuous process improvement program, US Digital is changing the current marking method for our EM1 and EM2 encoder modules to a serialization method. This change will allow for each module to have a unique code; the current marking method is based on a date code system that includes all encoder modules produced within a specific week / year. The serialization system will be based on a hexadecimal system. Download
EOL Sealed Housing Option - PCN 1021 4/11/2013 This PCN is a formal notification that US Digital is discontinuing the Sealed Housing option for the following products:
  • A2 Absolute Optical Encoder
  • A2T Absolute Optical Inclinometer
  • H1 Ball Bearing Optical Shaft Encoder
  • H3 Ball Bearing Optical Shaft Encoder
  • S1 Optical Shaft Encoder
  • S2 Optical Kit Encoder
The Sealed Housing option provides the encoder with low level capability of surviving in moisture environments, however the encoder is NOT waterproof or intended to be used in applications where this is required.		 Download
EM1 LED Die - PCN 1016 2/7/2013 As part of US Digital's continual assurance of supply strategy, we have qualified additional sources for our LED die used in our EM1 encoder module, which in turn impacts all of the following products:

EM1, E2, E3, E5, E6, H1, H15, H3, H5, H6, HB5M, HB6M, HD25, PE, S1, S2, S5, S6, T5 and T6

The device specification will remain the same, i.e. there will be no change to form, fit or function of the product(s) as specified by US Digital. The appropriate quality and reliability testing has been performed on representative products to ensure normal parametric distribution, consistent with US Digital's quality and reliability standards.		 Download

Additional Information

Product Notes

  • Cables and connectors are not included and must be ordered separately.
  • For ordering information please see the Compatible Cables / Connectors section above.
  • US Digital® warrants its products against defects in materials and workmanship for two years. See complete warranty for details.

Datasheets

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