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HEDL- 64XX Series Optical Incremental Housed Encoders
Data Sheet
Features * Two channel quadrature output with optional index pulse * Quick and easy assembly * Cost-effective * Small form factor * IP50 * Resolutions up to 512 Counts Per Revolution * -25C to 90 operating temperature * Built-in RS 422 differential line driver * Hub available in 2,3 and 4 mm shaft sizes. * Coupling plate or threaded mount mounting options available
Description The HEDL- 64XX series are high performance, cost effective, twochannel optical incremental housed encoders with optional index pulse. These encoders emphasize high reliability, high resolution and easy assembly. The HEDL- 64XX housed encoders use transmissive technology to sense rotary position. This sensor consists of an LED light source, a photodetector IC and line driver. The outputs of the HEDL- 64XX encoders are 2 square waves in quadrature and and an optional gated index pulse. These encoders may be quickly and easily mounted to a motor.
Available Styles Threaded Hole Version
Coupling Plate Version
Package Dimensions Threaded Mount Version
Coupling Plate Version
2
Theory of Operation The HEDL- 64XX translates rotary motion of a shaft into a two or three channel digital output. The HEDL- 64XX series has four key parts: a single light emitting diode (LED) light source, a photodetector IC with a set of uniquely configured photodiodes , a line drive IC and a pair of lenses. The lens over the LED focuses light onto the codewheel. As the codewheel rotates, an alternating pattern of light and dark corresponding to the pattern of the codewheel falls upon the photodiodes. This light is used to produce internal signals A and A', and B and B'. As part of this "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 and B and index.
Definitions Count (N): For rotary motion, the number of bar and window pairs or counts per revolution(CPR) of the codewheel. For linear motion, the number of bar and window pairs per unit length (lines per inch[LPI] or lines per mm [LPmm]). One Cycle(C): 360 electrical degree(e), 1 bar and window pair. One Shaft Rotation: 360 mechanical degrees, N cycles (rotary motion only). Line Density: The number of reflective and non- reflective pairs per unit length, expressed as either lines per inch(LPI) or lines per mm (LPmm). Cycle error(C):: An indication of cycle uniformity. The difference between an observed shaft angle which gives rise to one electrical cycle and the nominal angular increment of 1/ N of a revolution
Pulse Width (P): The number of the electrical degrees that an output is high during one cycle, nominally 180e or 1/2 a cycle. Pulse Width Error(P): The deviation in electrical degrees of the pulse width from its ideal value of 180e. 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 90e. State Width Error (S): The deviation in electrical degrees of each state width from its ideal value of 90e. Phase (f): 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 90e. Phase error (f): The deviation in electrical degrees of the phase from its ideal value of 90e. Position error (q):: The normalized angular difference between the actual shaft position and the position indicated by the encoder cycle count. Index Pulse Width (Po): The number of electrical degrees that an index is high during one full shaft rotation. This value is nominally 90e or 1/4 cycle.
RESISTOR Vcc PHOTODIODE Ch A Ch A LED LENS SIGNAL PROCESSING CIRCUITY Ch B Ch B I I
CODEWHEEL
Gnd
3
Output Waveforms
C P Channel A s1 Amplitude Channel B t1 t2 P0 Index s2 s3 s4 o
Codewheel Rotation
Direction of Motor Rotation When the codewheel rotates in the clockwise direction (top view), channel A will lead channel B. If the codewheel rotates in the counterclockwise direction, channel B will lead channel A. Pin Assignment Pin PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8 Signal Ch A Ch A' Ground Ch B Ch B' Vcc Index Index' Description Digital output Digital output Ground Digital output Digital output Input voltage Digital output Digital output Absolute Maximum Ratings Storage Temperature Operating Temperature Supply Voltage Output Voltage Output Current per Channel Frequency -40C to 100C -25C to 90C 4.5 V to 5.5 V -0.5 V to 5.5V -2.0 mA to 25 mA 100 kHz
Note s rpm = frequency * 60 / cpr Absolute Maximum Rating are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The table "Recommended Operating Conditions and Characteristics" provides conditions for actual device operation.
Recommended Operating Conditions Parameter Temperature Supply Voltage Symbol TA VCC Min. 0 4.5 Typical 25 5.0 Max. 90 5.5 Units C Volts Notes
4
Electrical Characteristics (over recommended operating conditions Typically at 25oC) Parameter Supply Current High level Output Voltage Low level Output Voltage Symbol ICC VOH VOL 2.4 0.2 Min. Typical 40 Max. 65 Units mA V V IOH = -2 mA min. IOL = 25 mA max Notes
Notes This device meets the ESD ratings below: Class C per EIA/JESD22-A115-A (MM) Class 1C per JESD22-A114-B (HBM)
Encoding Characteristics Parameter Pulse Width Error State Width Error Phase Error Position Error Cycle Error Index Pulse Width Index rise time after Ch B fall Index fall time after Ch A rise Symbol P S Df DQ C Po t1 t2 Typical 7 15 15 40 10 90 500 150 Max. 70 60 60 120 45 120 800 500 Units e e e arcmin e e ns ns
Mechanical Characteristics (refer to page 2 and 3 for details) Parameter Recommended Motor Shaft Diameters Adhesive Mount (recommended mounting glue type is Hernon 823 anaerobic glue or equivalent) Allowable Motor Shaft Length Coupling plate Threaded mount Bolt Circle Diameter : Coupling plate Threaded mount Mounting Screw Size: Coupling plate Threaded mount Max axial load Max radial load Bearing life (based on the above loading) Unit weight Sealing (per IEC 529) Humidity Vibration (per IEC 68-2-27) Shock (per IEC 68-2-27) Dimension/Details 2, 3, 4 Tolerance +/-.01 (+/-.0004) Units mm (in)
11.6 max 11.0 max 28.6 15.90 M2 M2x 3.5 0.3 0.3 2 x 10 10 22 IP50 98% RH max Non condensing 20g @ 10 Hz ~ 500 Hz 30 g @ 11ms +/-0.1 +/-0.05
mm
mm
mm kgf kgf rev gm
5
Electrical Interface This encoder is recommended to be used with line receiver DS26C32. Please refer to the diagram below.
Connectors The header to be used with the encoder is AMP Part Number 176264- 3 or equivalent. Mounting Considerations The mounting plates are designed to absorb normal installation misalignment and runouts . The user should minimize misalignment as much as possible to achieve optimum performance.
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APPLICATION NOTES Mares Mounting Recommendation Recommended gluing tool design
Specifications Material Application specific, stainless steel shim plate in general Application specific, ~0.3mm in general Application specific
Thickness Size Table 1 Motor shaft diameter, 0.01mm Motor It is recommended that anaerobic glue (thread lock glue such as Hernon 823 or equivalent) be applied to the mounting screws as the encoder is tightened to the motor base if the encoder will be operating under prolonged vibration or shock environment. The use of gluing tool is highly recommended. Insert the tool into motor shaft and apply glue around the shaft as shown below. This will help to control the glue thickness. The tool will scrape the excess glue as it is being removed from motor shaft. This will prevent the glue from overflowing into motor or encoder bearing as the motor shaft is inserted into encoder. 2.00 3.00 4.00
Recommended X, +0.02/-0mm 2.02 3.02 4.02
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Ordering Information
HEDL - 64
-
Channels 0 - 2 channel 4 - 3 channel
Ribbon cable connection 2Pigtail 3Connector
Resolution A - 500 CPR I - 512 CPR
Mounting P - Coupling plate T - Tab Hole
Shaft Size 01 2mm 02 3mm 11 4mm
* 4mm shaft size is not available for 3 channel devices.
www.agilent.com/semiconductors
For product information and a complete list of distributors, please go to our web site. Data subject to change. Copyright 2003 Agilent Technologies, Inc. October 03, 2003 5989-0101EN

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