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Data Sheet - Series E Incremental Encoders

Ultra-Miniature, High-Resolution with Flexible Mounting Features

Key Features

  1. Two Channel Quadrature Output with Index
  2. Ultra-Miniature size (Ø0.787 in (Ø17 mm))
  3. Cost Effective
  4. Resolution Up to 7500 Cycles per Revolution (cpr); up to 30000 counts with 4X decoding
  5. Integrated RS 422 Differential Linedriver
  6. Choice of Shaft Sizes, Mounting Features, and Electrical Terminations

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

Need something not shown? Complete a Custom Solution Request.

All dimensions are REFERENCE and are in inches [mm] • Document number: S021X(DRAFT050912)

Page last modified on 2006-11-13 17:35
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