Ultra-Miniature, High-Resolution with Flexible Mounting Features
Key Features
- Two Channel Quadrature Output with Index
- Ultra-Miniature size (Ø0.787 in (Ø17 mm))
- Cost Effective
- Resolution Up to 7500 Cycles per Revolution (cpr); up to 30000 counts with 4X decoding
- Integrated RS 422 Differential Linedriver
- 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)
