S2 Optical Shaft Encoder

Photos (4)
Mechanical Drawings (1)

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

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.

Three shaft torque options are available:

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.

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. 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 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/F_r)³ * Where L₁₀ = bearing life in millions of revs, and F_r = 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

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	I_OL = 8mA max., CPR < 3600
			0.5	mA	I_OL = 5mA max., CPR ≥ 3600
		0.05		mA	no load, CPR < 3600
		0.25		mA	no load, CPR ≥ 3600
High-level Output	2.0			V	I_OH = -8mA max., CPR < 3600
	2.0			V	I_OH = -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
Output Current Per Channel	-5		5	mA	CPR ≥ 3600
Output Rise Time		110		nS	CPR < 3600
Output Rise Time		50		nS	CPR ≥ 3600
Output Fall Time		35		nS	CPR < 3600
Output Fall Time		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

S2-Datasheet.pdf

3D Model Downloads

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