S2 Features
- 2-channel quadrature, TTL square wave outputs
- 3rd channel index option
- 64 to 10,000 CPR (256 to 40,000 PPR)
- Ball-bearing option tracks to 10,000 RPM
- Wide operating temperature
- Single +5V supply
S2 Product Description
The S2 series high resolution optical shaft encoder is a non-contacting rotary to digital converter. Useful for position feedback or manual interface, the encoder converts real-time shaft angle, speed, and direction into TTL-compatible quadrature outputs with or without index. It operates from a single +5VDC supply.
The S2 is our first generation ball-bearing optical shaft encoder and is available for those customers who have designed it into their products; however, the S6 is recommended for new designs in place of the S2.
Three shaft torque options are available:
- Default (-D): sleeve bushing with higher damping for human interface applications.
- Ball bearing (-B): miniature precision ball bearings suitable for high-speed applications.
- Light static drag (-N): sleeve bushing with lower damping for low-speed applications.
The S2 is designed to drive cables up to 10 feet long. For longer cable lengths, adding a PC4/PC5 differential line driver is recommended. Connection to the S2 series encoder is made through a 5-pin standard connector. The mating connectors are available from US Digital with several cable options and lengths.
Mechanical Drawings
Specifications
ENVIRONMENTAL
| PARAMETER | VALUE | UNITS |
|---|---|---|
| Operating Temperature, CPR < 2000 | -40 to 100 | C |
| Operating Temperature, CPR ≥ 2000 | -25 to 100 | C |
| Electrostatic Discharge, IEC 61000-4-2 | ± 4 | kV |
| Vibration (10Hz to 2kHz, sinusoidal) | 20 | G |
| Shock (6 milliseconds, half-sine) | 75 | G |
MECHANICAL
| PARAMETER | SLEEVE BUSHING | BALL BEARING |
|---|---|---|
| Max. Acceleration | 250000 rad/sec² | 250000 rad/sec² |
| Max. Shaft Speed (mechanical) | 100 rpm (1) | 10000 rpm (1) |
| Max. Shaft Torque | 0.5 in-oz (D-option) 0.3 in-oz (N-option) |
0.05 in-oz (B-option) |
| Max. Shaft Loading | 2 lbs. dynamic 20 lbs. static |
1 lb. |
| Bearing Life | > 1000000 revolutions | L10 = (19.3/Fr)³ * Where L10 = bearing life in millions of revs, and Fr = radial shaft loading in pounds |
| Weight | 1.28 oz. | 1.28 oz. |
| Max. Shaft Runout | 0.0015 in. T.I.R. | 0.0015 in. T.I.R. |
| Max. Panel Nut Tightening Torque | 20 in-lbs | 20 in-lbs |
| Technical Bulletin TB1001 - Shaft and Bore Tolerances | Download | |
* Only valid with negligible axial shaft loading.
(1) The maximum speed due to electrical considerations is dependent on the CPR. See the EM1 and EM2 product pages.
PHASE RELATIONSHIP
B leads A for clockwise shaft rotation, and A leads B for counterclockwise rotation when viewed from the shaft side of the encoder.
ELECTRICAL
- Specifications apply over the entire operating temperature range.
- Typical values are specified at Vcc = 5.0Vdc and 25°C.
- For complete details, see the EM1 and EM2 product pages.
| PARAMETER | MIN. | TYP. | MAX. | UNITS | CONDITIONS |
|---|---|---|---|---|---|
| Supply Voltage | 4.5 | 5.0 | 5.5 | V | |
| Supply Current | 27 | 33 | mA | CPR < 1000, no load | |
| 54 | 62 | mA | CPR ≥ 1000 and < 3600, no load | ||
| 72 | 85 | mA | CPR ≥ 3600, no load | ||
| Low-level Output | 0.5 | V | IOL = 8mA max., CPR < 3600 | ||
| 0.5 | mA | IOL = 5mA max., CPR ≥ 3600 | |||
| 0.05 | mA | no load, CPR < 3600 | |||
| 0.25 | mA | no load, CPR ≥ 3600 | |||
| High-level Output | 2.0 | V | IOH = -8mA max., CPR < 3600 | ||
| 2.0 | V | IOH = -5mA max., CPR ≥ 3600 | |||
| 4.8 | V | no load, CPR < 3600 | |||
| 3.5 | V | no load, CPR ≥ 3600 | |||
| Output Current Per Channel | -8 | 8 | mA | CPR < 3600 | |
| -5 | 5 | mA | CPR ≥ 3600 | ||
| Output Rise Time | 110 | nS | CPR < 3600 | ||
| 50 | nS | CPR ≥ 3600 | |||
| Output Fall Time | 35 | nS | CPR < 3600 | ||
| 50 | nS | CPR ≥ 3600 |
Notes
- Cables and connectors are not included and must be ordered separately.
- For ordering information please see the Compatible Cables / Connectors section above.
- US Digital® warrants its products against defects in materials and workmanship for two years. See complete warranty for details.
Configuration Options |
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| S2 | - | CPR (Cycles Per Revolution) 64 1000 1024 2000 2048 2500 3600 4000 4096 5000 7200 8000 8192 10000 | - | Shaft Diameter 236 (6mm) 250 (1/4") | - | Index IE (Index) NE (Non-Index) | - | Torque D (Default Torque) B (Ball Bearing) N (Light Static Drag) | - | Housing D (Default) | ||||||||||||||||||||||
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PLEASE NOTE: This chart is for informational use only. Certain product configuration combinations are not available. Visit the S2 product page for pricing and additional information. |
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