S4 Product Description The S4 miniature 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 without index. The encoder utilizes a mylar disk, metal shaft, and bushing or bearing. It operates from a single +5VDC supply.
The S4 encoder is available with ball bearings for motion control applications or static drag to feel like a potentiometer for the front-panel manual interface.
The reflective sensor incorporates an LED light source and a monolithic photodetector with signal shaping electronics, providing two-channel bounceless quadrature TTL outputs.
You can connect the S4 by using a high retention 4 conductor snap-in polarized 1.25mm pitch connector. The mating connector is polarized and should attach smoothly to the encoder; do not force. See below for Cables & Connectors.
Please note: On January 16, 2012, US Digital modified the S4 part number. The S4 optical encoder is now offered with a differential output option; thus, we changed the S4 part number to accommodate either the single-ended or differential output options. The S4 part number also has a place holder added for a possible future index option. The index option is currently unavailable, and there is no projected date at which it will be made available. We also removed the current "Power" option for the S4 from the part number. The power option is very rarely selected and therefore is being eliminated from the S4 part number.
Product Specifications
ENVIRONMENTAL
PARAMETER
VALUE
UNITS
Vibration (5Hz to 2kHz)
20
G
Operating Temperature
-20 to 100
C
Electrostatic Discharge, IEC 61000-4-2S -option)D -option)
MECHANICAL
SPECIFICATION
SLEEVE BUSHING
BALL BEARING
Max. Acceleration
10000 rad/sec²
250000 rad/sec²
Max. Shaft Speed
100 rpm
15000 rpm
Max. Shaft Torque
0.5 ±0.2 in-oz (D -option)N -option)
0.05 in-oz
Max. Shaft Loading
2 lbs. dynamic
1 lb.
Bearing Life
> 1,000,000 revolutions
L10 = (22/Fr )³ *L10 = bearing life in millions of revs, andFr = radial shaft loading in pounds
Weight
0.46 oz.
0.42 oz.
Max. Shaft Total Indicated Runout
0.0015 in.
0.0015 in.
Max. Panel Nut Tightening Torque
20 in-lbs
20 in-lbs
Technical Bulletin TB1001 - Shaft and Bore Tolerances
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* only valid with negligible axial shaft loading.
PHASE RELATIONSHIP
PARAMETER
TYP.
MAX.
UNITS
Symmetry, S
180 ± 16
180 ± 75
electrical degrees
Quadrature Delay, Q
90 ± 10
90 ± 60
electrical degrees
(1) B leads A for clockwise shaft rotation, and A leads B for counterclockwise rotation viewed from the shaft side of the encoder.
(2) Typical values represent the encoder performance at typical mounting alignment, whereas the maximum values represent the encoder performance across the range of recommended mounting tolerance.
SINGLE-ENDED ELECTRICAL
SPECIFICATIONS
MIN.
TYP.
MAX.
UNITS
NOTES
Supply Voltage
4.5
5.0
5.5
V
Supply Current
21
27
mA
no load
Low-level Output
0.4
V
IOL = 6 mA
High-level Output
2.4
V
IOH = -1 mA
Rise Time
500
ns
CL = 25 pF, RL = 2.7 kΩ
Fall Time
100
ns
DIFFERENTIAL ELECTRICAL
SPECIFICATIONS
MIN.
TYP.
MAX.
UNITS
NOTES
Supply Voltage
4.5
5.0
5.5
V
Supply Current
23
29
mA
no load
Differential Output Voltage
3.0
3.8
V
RL = 100 ohm
Differential Output Rise/Fall Time
20
ns
PIN-OUT
4-PIN SINGLE-ENDED (1)
6-PIN DIFFERENTIAL (2)
Pin
Description
Pin
Description
1
+5VDC power
1
Ground
2
A channel
2
A channel
3
Ground
3
A- channel
4
B channel
4
+5VDC power
5
B channel
6
B- channel
(1) 4-pin single-ended mating connector is CON-MIC4 CON-MIC6
PRODUCT CHANGE NOTIFICATIONS
Title
Date
Description
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E4, E4P, S4 - PCN 5741
05/09/2016
As part of our on-going product lifecycle management process, we have identified products that will be transitioned to an "End-of-Life" status. Products targeted for end-of-life may be available for a last time buy option prior to being made obsolete, however quantities are limited and special requirements may apply.
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E4 - E4P - S4 Update - PCN 1014
11/29/2011
We have modified the E4, E4P and S4 product lines in order to improve the performance and durability of the encoder. Changes include new molds for the plastic base and cover parts with an over-molded bushing in the S4 base, a new SMT connector (compatible with current mating connector), and a modified PCB profile to accommodate the new connector and plastic part modifications.
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Additional Information
Related
Datasheet
Feedback
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