oH
VE S CO
AV R M
AI SIO PL
LA N IA
BL S NT
E
Features
■
■
■
■
■
■
Two channel quadrature output
Bushing or servo mount
Square wave signal
Index channel available
Small size
Resolution to 256 PPR
■
■
■
CMOS and TTL compatible
Long life
High operating speed
*R
EN - Rotary Optical Encoder
Electrical Characteristics
Output ..............................................................................................2-bit gray code, Channel A leads Channel B by 90 º (electrical) with clockwise rotation
Resolution ..................................................................................................................................................................................25 to 256 cycles per revolution
Insulation Resistance (500 VDC) ......................................................................................................................................................................1,000 megohms
Electrical Travel ........................................................................................................................................................................................................Continuous
Supply Voltage ..........................................................................................................................................................................................5.0 VDC ±0.25 VDC*
Supply Current ................................................................................................................................................................................................26 mA maximum
Output Voltage
Low Output ....................................................................................................................................................................................................0.8 V maximum
High Output........................................................................................................................................................................................................4 V minimum
Output Current
Low Output ..................................................................................................................................................................................................25 mA minimum
Rise/Fall Time ......................................................................................................................................................................................................200 ns (typical)
Shaft RPM (Ball Bearing)............................................................................................................................................................................3,000 rpm maximum
Power Consumption......................................................................................................................................................................................136 mW maximum
Pulse Width (Electrical Degrees, Each Channel) ..............................................................................................................................................180 º ±45 º TYP.
Pulse Width (Index Channel) ....................................................................................................................................................................................360 º ±90 º
Phase (Electrical Degrees, Channel A to Channel B)..........................................................................................................................................90 º ±45 º TYP.
Index Channel Centered on 1-1 State Combination of A and B Channels ..................................................................................................................0 º ±45 º
*Consult factory for other voltages up to 5 VDC.
Environmental Characteristics
Operating Temperature Range ..........................................................................................................................................-40 ºC to +75 ºC (-40 °F to +167 °F)
Storage Temperature Range ............................................................................................................................................-40 °C to +85 °C (-40 °F to +185 °F)
Humidity....................................................................................................................................................................MIL-STD-202, Method 103B, Condition B
Vibration ................................................................................................................................................................................................................................5 G
Shock ..................................................................................................................................................................................................................................50 G
Rotational Life
A & C Bushings (300 rpm maximum)** ..............................................................................................................................................10,000,000 revolutions
W, S & T Bushings (3,000 rpm maximum)** ....................................................................................................................................200,000,000 revolutions
IP Rating ..............................................................................................................................................................................................................................IP 40
Mechanical Characteristics
Mechanical Angle ............................................................................................................................................................................................360 ° Continuous
Torque (Starting and Running)
A & C Bushings (Spring Loaded for Optimum Feel) ................................................................................................................1 N-cm (1.5 oz-in.) maximum
W, S & T Bushings (Ball Bearing Shaft Support) ................................................................................................................0.07 N-cm (0.1 oz-in.) maximum
Mounting Torque ....................................................................................................................................................1.7 to 2.0 N-cm (15 to 18 lb.-in.) maximum
Shaft End Play ......................................................................................................................................................................0.30 mm (0.012 ”) T.I.R. maximum
Shaft Radial Play ..................................................................................................................................................................0.12 mm (0.005 ”) T.I.R. maximum
Weight ..............................................................................................................................................................................................................11 gms. (0.4 oz.)
Terminals ........................................................................................................................................................................Axial or radial pc pins or ribbon cable
Soldering Condition
Manual Soldering ....................................................................................................................96.5Sn/3.0Ag/0.5Cu solid wire or no-clean rosin cored wire
370 °C (700 °F) max. for 3 seconds
Wave Soldering ..............................................................................................................................................96.5Sn/3.0Ag/0.5Cu solder with no-clean flux
260 °C (500 °F) max. for 5 seconds
Wash processes ........................................................................................................................................................................................Not recommended
Marking ..................................................................................................................................Manufacturer’s trademark, name, part number, and date code.
Hardware ..................................................................One lockwasher and one mounting nut supplied with each encoder, except on servo mount versions.
**For resolutions ≤ 128 quadrature cycles per shaft revolution.
Quadrature Output Table
OUTPUT VOLTAGE
Channel A
Channel B
Index
Channel
(Optional)
4.0 V (Min)
0.8 V (Max)
4.0 V (Min)
0.8 V (Max)
4.0 V (Min)
0.8 V (Max)
1 cycle
360
° ±
90
°
Clockwise rotation
STANDARD RESOLUTIONS AVAILABLE
1
0
1
0
1
0
(Full quadrature output cycles per shaft revolution)
25*
125
50*
128
64
200
100
256
For Non-Standard Resolutions—Consult Factory
* Channel B leads Channel A
*RoHS Directive 2002/95/EC Jan 27 2003 including Annex
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
GENERAL INFORMATION
The Bourns
®
EN model is a self-contained rotary optical encoder. It
produces a 2-bit quadrature signal which is suitable for digital systems
where both magnitude and direction of adjustment must be provided.
The EN encoder is ideal for use as a digital panel control or as a position
sensing device in applications where long life, reliability, high resolution
and precise linearity are critical.
The EN series encoder converts rotary input into electrical signals
which can be used by microprocessors without A/D conversion.
Bourns encoder output signals are square wave digital pulses which do
not require debounce circuitry. Both features make it possible to
significantly reduce the memory overhead, wiring and wiring
interconnects required by other types of control devices.
EN optical encoders offer a useful rotational life of from 10 million to
200 million shaft revolutions, making them ideal for extended service
applications. The Bourns encoder is also compact and well suited for
situations where the available space is limited.
EN - Rotary Optical Encoder
Dimensional Drawings
Optional
Radial Leads
.635
SQ.
(.025)
18.5
(.73)
15.88
(.625)
2.36
(.093)
21.21
(.835)
1/4-32 UNEF
3.167 + .000/ – .0076
DIA.
(.1247 + .000/ – .0003)
1.37
(.054)
9.53
(.375)
2.54
TYP.
(.100)
6.35
(.250)
9.525
(.375)
8.636
(.34 )
Consult factory for options not shown,
including:
• Wire lead or cable options
• Connectors
• Non-standard resolutions
• Special shaft/bushing sizes and
features
• Special performance characteristics
• PCB mounting bracket
Bushing Style
C
6.342 + .000/ – .0076
DIA.
(.2497 + .000/ – .0003)
3/8-32 UNEF
10.32 + .000/ – .0508
DIA.
(.4062 + .000/ – .002)
9.53
(.375)
7.14 + .000/ – .0508
DIA.
(.281 + .000/ – .002)
9.53
(.375)
R.
.254
±
.076
(.010 .003)
F
6.34
(.2497)
5.54
(.218)
SHAFT
LENGTH
12.7
(.050)
15.9
(.625)
9.53
(.375)
1.57
3/8-32 UNEF
(.062)
6.342 + .000/ – .0076
DIA.
(.2497 + .000/ – .0003)
1/4-32 UNEF
1.57
(.062)
3.167 + .000/ – .0076
DIA.
(.1247 + .000/ – .003)
.787
±
.254
(.031
±
.010)
19.1
(.750)
SHAFT FLAT
LENGTH
(DIM. F)
2.54
(.100)
5.08
(.200)
8.25
(.325)
Bushing Style
A
Bushing Style
S
(Ball Bearing)
Bushing Style
T
(Ball Bearing)
1.57
(.062)
1.57
(.062)
1.57
(.062)
Anti-rotation Lug
View
Shaft End Style
C
2.54
4 PLCS.
(.100)
4.14
(.163)
TERMINATION DIAGRAM
INDEX
OR CHANNEL A
N.C.
11.13
(.438)
3.167 + .000/ – .0076
DIA.
(.1247 + .000/ – .003)
18.11
(.713)
21.8
(.86)
Vcc
CHANNEL B
GROUND
Optional
Radial Leads
-
A
+
B
19.05
±
.0127
DIA.
(.7500
±
.0005)
22.2 + .0127 / – .1270
DIA.
(.875 + .0005 / – .0050)
9 PLCS.
0.99
DIA. MIN.
(.039)
6.99
2 PLCS.
(.275)
Servo Mount Style
W
(Ball Bearing)
Recommended Board Layout
with Bracket
Ribbon Cable Option Detail
Bushing with Bracket
Side Exit
Connector
Pinout
— A +B
Connector
Pinout
5
4
3
2
1
5
4
3
2
1
Ribbon Cable Option
Rear Exit
Ribbon Cable Option
Side Exit
DIMENSIONS:
MM
(IN.)
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
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