OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Incremental Shaft Encoder
OPE1275S Single Channel (Tachometer)
OPE2275S Dual Channel
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com Issue A 10/09
Page 1 of 4
Applications:
• Printer motors
• Machine automation
• Machine safety
Features:
• Body O.D. = 28mm [1.10”]
• Shaft Diameter 6.35 mm [0.25”]
• 3/8”-32 UNF Thread
• Pulses per revolution 256 maximum
• Analog Output
• 100 - 5,000 RPM
Description:
The OPE1275S and OPE2275S are designed for small shaft motors. The OPE1275S provides a single channel
analog output for speed of rotation while the OPE2275S provides a dual channel analog output for speed and
direction of rotation.
The output of the OPE1275S provides a rise and fall pulse providing the designer two slopes for each pulse
doubling the count capability. The OPE2275S provides quadrature rise and fall pulse pattern s providing the
design engineer 4 times the pulse per revolution count.
Power requirements are 5 volts ± .5 volts.
Electrical connection is achieved with a 4 -pin Mol ex 53048-0410 co nnector providing V+, Ground and Outp ut pins.
The mating connector is a 4-pin Molex 51021-0400 (Terminal pin 50058 or 50079)
or equivalent.
Frequency response is fro m DC to 25 kHz providing a maximum of 256 cycles p er revolution (CPR) and 1024
quadrature states pe r revolution (PPR).
This product is designed for general encoding for low-speed ap plications.
The OPE1275S and OPE2275S are fully assem bled and ready to be connected to your application.
RoHS
Ordering Information
OPE X 275 S - ZZZ
OPTEK Product Encoder Resolution per revolution:
128 holes per revolution
Channels: 256 holes per revolution
1 = Single channel
2 = Dual Channel Shaft Configuration:
Motor Diameter- 27.5mm S = Extended Shaft
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Incremental Shaft Encoder
OPE1275S Single Channel (Tachometer)
OPE2275S Dual Channel
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A 10/09
Page 2 of 4
OPE1275S
OPE2275S
1 2 3 4
VCC CH A CH B GND
Pin Out
PIN #1
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Incremental Shaft Encoder
OPE1275S Single Channel (Tachometer)
OPE2275S Dual Channel
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com Issue A 10/09
Page 3 of 4
Electrical Characteristics (TA = 25°C unless otherwise noted — for reference only)
SYMBOL PARAMETER MIN TYP MAX UNITS TEST CONDITIONS
VCC Supply Voltage 4.5 5.0 5.5 V
ICC Supply Current - 21 27 mA VCC = 5.0 volts
VOH High Level Output Voltage Vcc-0.5 - - V IC = 100 µA
VOL Low Level Output Voltage - - 0.4 V IC = 20 mA
TR Rise Time - 500 - ns 10% to 90%, VCC = 5.0 volts
TF Fall Time - 100 - ns 10% to 90%, VCC = 5.0 volts
FR Frequency Response - - 60 kHz
H.S. Hole Size 0.10 - - inch
Rotation Maximum speed of rotation with 1024
holes per rotation - - 100 rev/sec
Encoding Characteristics:
SE Symmetry Error 0 16 75 °e
QE Quadrature Error—OPE2275 only 0 12 60
Notes:
1. All parameters measured using pulse technique, Vcc = 5.0 volts and TA = 25°C.
Absolute Maximum Ratings (TA=25°C unless otherwi se noted)
Maximum Units
Storage Temperature Range -40o C to +85o C
Operating Temperature Range 0o C to +85o C
Power Supply Voltage VCC 4.5 to 5.5 VDC
Power Dissipation(2) 250 mW
Vibration (5 Hz to 2 kHz) 20 g
Shaft Axial Play ± 0.51 mm [0.02”]
Off-Axis Mounting Tolerance 0.254 mm [0.01”]
Acceleration 250,000 rad/sec2
Mechanical Specifications:
Dimensions Units
Moment of Inertia 6.48 X 10-5 OZ-IN-S2
Shaft Length 0.3 to 0.7 Inches
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Incremental Shaft Encoder
OPE1275S Single Channel (Tachometer)
OPE2275S Dual Channel
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A 10/09
Page 4 of 4
Timing Definitions:
PPR = Pulses Per Revolution
Electrical Degree (°e) = 1/360th of 1 cycle
Cycle = 360 electrical degrees (°e)
Symmetry = Relationship between X & Y in electrical
degrees (°e).
Position Error = The difference between the actual
shaft position and the position indicated by
the encoder cycle count.
Quadrature: The lead or lag difference between
channels “A” and “B” in el ectrical degrees
(normally 90°e)
Cycle Error = The difference between the actual shaft
rotational position and the cycle count
rotational position.
Rise Time = Time required to switch between 1 0% and
90% of the highest to lowest signal levels.
Fall Time = Time required to switch bet ween 90% and
10% of the highest to lowest signal levels.
Timing Diagram:
