S1
Description
Optical Shaft Encoder
Page 1 of 6
The S1 series 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. The encoder utilizes a mylar disk, metal shaft and
bushing, LED light source, and monolithic electronics. It operates from a single
+5VDC supply.
The S1 is normally designed for applications of 10 feet or less. For longer cable
lengths, adding a PC4 / PC5 differential line driver is recommended.
Three shaft torque versions are available. The standard torque version has a
sleeve bushing lubricated with a viscous motion control gel to provide torque and
feel that is ideal for front panel human interface applications.
The no torque added option has a sleeve bushing and a low viscosity lubricant
(that does not intentionally add torque) for low RPM applications where a small
amount of torque is acceptable.
The ball bearing version uses miniature precision ball bearings that are suitable
for high speed and ultra low torque applications.
Connection to the S1 series encoder is made through a 5-pin standard connector
(sold separately). The mating connectors are available from US Digital with
several cable options and lengths.
Features
Small size
Low cost
2-channel quadrature,TTL squarewave outputs
3rd channel index option
Tracks from 0 to 300000 cycles/sec
Ball bearing option tracks to 10,000 RPM
-25 to +100C operating temperature
Single +5VDC supply
32 - 5000 CPR
Mechanical Drawing
Rev. 150223122350
S1
Optical Shaft Encoder
Page 2 of 6
Environmental
Parameter
Operating Temperature, CPR < 2000
Operating Temperature, CPR
Vibration (5Hz to 2kHz)
Electrostatic Discharge, Human Body Model
2000
Value
-40 to 100
-25 to 100
20
±4
Units
C
C
G
kV
Mechanical
Parameter
Max. Acceleration
Max. Shaft Speed
Max. Shaft Torque
Max. Shaft Loading
Bearing Life
Sleeve Bushing
250000 rad/sec²
100 rpm
0.5 ±0.2 in-oz
0.3 in-oz (N-option)
2 lbs. dynamic
20 lbs. static
> 1000000 revolutions
Ball Bearing
250000 rad/sec²
10000 rpm
0.05 in-oz
1 lb.
L
10
= (19.3/F
r
)³ *
Where
L
10
= bearing life in millions of revs, and
F
r
= radial shaft loading in pounds
0.70 oz.
Weight
0.70 oz.
Rev. 150223122350
S1
Parameter
Optical Shaft Encoder
Page 3 of 6
Sleeve Bushing
0.0015 in.
20 in-lbs
Ball Bearing
0.0015 in.
20 in-lbs
Download
Max. Shaft Total Indicated Runout
Max. Panel Nut Tightening Torque
Technical Bulletin TB1001 - Shaft and Bore Tolerances
* only valid with negligible axial shaft loading.
Phase Relationship
B leads A for clockwise shaft rotation, and A leads B for counterclockwise rotation viewed from the shaft side of the encoder (see
the
EM1 page).
Electrical
Specifications apply over entire operating temperature range.
Typical values are specified at Vcc = 5.0Vdc and 25 C.
For complete details, see the EM1 or EM2 product pages.
Parameter
Supply Voltage
Supply Current
Min.
4.5
Typ.
5.0
27
54
72
Max.
5.5
33
62
85
0.5
0.5
Units
V
mA
mA
mA
V
V
V
V
V
Conditions
CPR < 500, no load
CPR
CPR
500 and <2000, no load
2000, no load
Low-level Output
I
OL
= 8mA max., CPR < 2000
I
OL
= 5mA max., CPR
no load, CPR
2000
2000
0.25
High-level Output
2.0
2.0
4.8
3.5
Output Current Per Channel
-8
-5
Output Rise Time
110
50
Output Fall Time
100
50
8
5
I
OH
= -8mA max. and CPR < 2000
I
OH
= -5mA max. and CPR
no load and CPR < 2000
no load and CPR
CPR < 2000
CPR
2000
2000
2000
V
V
mA
mA
nS
nS
nS
nS
CPR < 2000
CPR
2000, ± 5mA load
CPR < 2000
CPR
2000, ± 5mA load
Pin-out
Rev. 150223122350
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