S2 Rotary Shaft Encoder

S2 Webproduct 01 Product Photo

S2 Features

  • Shafted rotary encoder
  • 14 Resolutions from 64 to 10,000 CPR (256 to 40,000 PPR)
  • Available in 6 mm and 1/4 in. shaft sizes
  • Three torque options
  • 2 channel quadrature TTL square wave output
  • Optional Index channel
  • High-retention connector/cable (sold separately)

See more info below

Configure the S2

US Digital S2 Rotary Shaft Encoder Description

Restriction of Hazardous Substances

The S2 rotary shaft encoder converts shaft position or speed into a quadrature output signal. This rotary encoder delivers up to 40,000 PPR resolution in a glass-filled polymer housing. Available in two shaft sizes: 6 mm, 1/4 in.

US Digital offers three different torque options for various uses: 

  • Default (-D): sleeve bushing with higher damping for human interface applications.

  • Ball bearing (-B): miniature precision ball bearings suitable for high-speed applications.

  • Light static drag (-N): sleeve bushing with lower damping for low-speed applications.

This optical rotary encoder is designed to drive cables up to 10 feet long. For longer cable lengths, we recommend using the model S6 and selecting the differential output. Another option is to add a PC4/PC5 differential line driver to this encoder. 

This S2 incremental encoder is designed for use with a high-retention connector. After you make your selections in the Product Configurator, compatible cables and connectors will be displayed below and must be ordered separately.

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 in-oz (D-option)
0.3 in-oz (N-option)		 0.05 in-oz (B-option)
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
54
72		 33
62
85		 mA
mA
mA		 CPR < 1000, no load 
CPR ≥ 1000 and < 3600, no load
CPR ≥ 3600, no load
Low-level Output  

0.05
0.25		 0.5
0.5		 V
mA
mA
mA		 IOL = 8mA max., CPR < 3600
IOL = 5mA max., CPR ≥ 3600
no load, CPR < 3600
no load, CPR ≥ 3600
High-level Output 2.0
2.0

4.8
3.5		   V
V
V
V		 IOH = -8mA max., CPR < 3600
IOH = -5mA max., CPR ≥ 3600
no load, CPR < 3600
no load, CPR ≥ 3600
Output Current Per Channel -8
-5		   8
5		 mA
mA		 CPR < 3600
CPR ≥ 3600
Output Rise Time   110
50		   nS
nS		 CPR < 3600
CPR ≥ 3600
Output Fall Time   35
50		   nS
nS		 CPR < 3600
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.
  • US Digital® warrants its products against defects in materials and workmanship for two years. See complete warranty for details.

Related

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    Datasheet

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