Ultra-Miniature, High-Resolution with Flexible Mounting Features
Key Features
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Description
The Series E are high performance, cost effective, three-channel optical incremental encoders. Series E encoders emphasize high reliability, high resolution and easy assembly, using transmissive encoder technology to sense rotary position. Outputs of the Series E encoders are two channel quadrature outputs and a third channel gated index output. These encoder modules can be easily mounted to customer-specific applications using a choice of shaft and mounting face options.
The Series E encoder translates rotary motion of a shaft into a three-channel digital output. The Series E encoder has five key parts: a single light emitting diode (LED) light source, a photodetector IC with a set of uniquely configured photodiodes, an interpolator IC, a line driver IC and a pair of lenses. This light is used to produce internal signals A and A-, and B and B-.
As part of the "push-pull" detector system, these signals are fed through comparators and line driver that are part of the signal processing circuitry to produce the final outputs for channels A.
Absolute Maximum Ratings
| Storage Temperature | -40° C to 125° C |
| Operating Temperature | -40° C to 125° C |
| Supply Voltage | 4.5 V to 5.5 V |
| Output Voltage | -0.5 V to cc V |
| Output Current per Channel | 20 mA |
| Frequency | 1 MHz |
Recommended Operating Conditions
| Parameter | Symbol | Min | Typical | Max | Units | Notes |
| Temperature | Ta | -40 | 25 | 125 | ° C | |
| Supply Voltage | Vcc | 4.5 | 5.0 | 5.5 | volts | Ripple <100 mVp-p |
| Frequency | f | 125 | 1000 | kHz | f = rpm x cpr / 60 | |
| Humidity | RH | 98 | % | non-condensing | ||
| Vibration | v | 20 | g | 50 to 500 Hz | ||
| Shock | s | 50 | g | 11 ms duration |
Maximum Frequency and RPM
| cpr | Max Frequency (kHz) | Max Speed (rpm) |
| 2500 | 1000 | 12000 |
| 5000 | 1000 | 12000 |
| 7500 | 1000 | 8000 |
| Note: Maximum frequency will be lower due to limitation in maximum RPM. | ||
Definitions
Count (N): N refers to the cycles per revolution (cpr) of the encoder output.
One Cycle (C): 360 electrical degrees (°e).
One Shaft Rotation: 360 mechanical degrees, N cycles (rotary motion only).
Phase (.): The number of electrical degrees between the center of the high state on the channel A and the center of the high state of channel B. This value is nominally 90°e.
Pulse Width (P): The number of the electrical degrees that an output is a high-level during one cycle, nominally 180°e or 1/2 a cycle.
Pulse Width Error (.P): The deviation in electrical degrees of the pulse width from its ideal value of 180°e.
Index Pulse Width (Po): The number of electrical degrees that an index is high during one full shaft rotation. This value is nominally 90°e or 1/4 cycle.
State Width (S): The number of the electrical degrees between a transition in the output of the channel B. There are 4 states per cycle, each nominally 90°e.
State Width Error (.S): The deviation in electrical degrees of each state width from its ideal value of 90°e.
Encoding Characteristics
| Parameter | Symbol | Typical | Max. | Units |
| Pulse Width Error | .P | 5 | 85 | °e |
| State Width Error | .P | 5 | 60 | °e |
| Phase Error | .P | 1 | 40 | °e |
| Encoding characteristics over recommended operating conditions. Typical values at 25° C | ||||
Electrical Characteristics
| Parameter | Symbol | Min | Typical | Max | Units |
| Supply Current | Icc | 55 | 80 | mA | |
| High level Output Voltage, V | OH | 2.5 | 3.4 | V | |
| Low level Output Voltage, V | OH | 0.3 | 0.5 | V | |
| Encoding characteristics over recommended operating conditions. Typical values at 25° C | |||||
Electrical Connections
| Pin | Signal | Description |
| 1 | A+ | Digital Output - Ch A |
| 2 | A- | Digital Output - Ch A not |
| 3 | Gnd | Ground |
| 4 | Gnd | Ground |
| 5 | B+ | Digital Output - Ch B |
| 6 | B- | Digital Output - Ch B not |
| 7 | Vcc | Input Voltage |
| 8 | Vcc | Input Voltage |
| 9 | I+ | Digital Output - Index |
| 10 | I- | Digital Output - Index not |
| Note: Both Pin 7 and Pin 8 must be connected to Vcc. Either Pin 3 or Pin 4 must be connected to Gnd. | ||
Mating Connector
The Series E encoder requires a 5 x 2 (1.27mm x 1.27mm) female IDC Connector. The cable used is 0.635mm pitch flat ribbon cable.
Electrical Interface
A compatible line receiver is the National Semiconductor DS26C32AM Quad Differential Line Receiver. Unused pin should be grounded for noise reduction.
Ordering Codes
| Order Code Format | Description |
| abcde | rotary encoder |
| Example: E1231 (E rotary encoder, 2 mm hollow shaft, Ø 0.875 in servo mount, 7500 cpr resolution, straight pin electrical termination) | |
| Variable | Value | Description |
| a | E | rotary encoder |
| b | 1 | shaft: thru, Ø2 mm |
| 2 | shaft: thru, Ø2.5 mm | |
| 3 | shaft: thru, Ø3 mm | |
| 4 | shaft: thru, Ø4 mm | |
| 5 | shaft: thru, Ø0.125 in | |
| 6 | shaft: Ø0.125 in | |
| c | 1 | mounting face: 20 mm/0.787 in servo and 3-hole face |
| 2 | mounting face: 0.875 in servo | |
| 3 | mounting face: tether (ears) | |
| 4 | mounting face: 3/8-32 UNEF-2A 3/8 in panel mount with nut and lockwasher | |
| d | 1 | resolution: 2500 cpr |
| 2 | resolution: 5000 cpr | |
| 3 | resolution: 7500 cpr | |
| e | 1 | electrical connector: 3 straight pins |
| 2 | electrical connector: 3 straight pins with mating connector | |
| 3 | electrical connector: 8-in (203-mm) long, 10-conductor ribbon cable with connector |
Output Waveforms
Direction of Encoder Rotation: When the shaft rotates in a clockwise direction (when viewed from the shaft end), channel A will lead channel B. When the shaft rotates in a counter-clockwise direction (when viewed from the shaft end), channel B will lead channel A.
Drawings
shown with mounting face 1
shown with mounting face 2
shown with mounting face 3
shown with mounting face 4
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All dimensions are REFERENCE and are in inches [mm] • Document number: S021X(DRAFT050912)