HEDL- 64XX Series Optical Incremental Housed Encoders Data Sheet Features 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 • 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 • -25°C 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 Package Dimensions Threaded Mount Version Coupling Plate Version 2 Theory of Operation Definitions 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. 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]). 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. 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 RESISTOR Vcc PHOTODIODE Ch A Ch A LED SIGNAL PROCESSING CIRCUITY LENS Ch B Pulse Width (P): The number of the electrical degrees that an output is high 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. 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. 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 90°e. Phase error (∆f): The deviation in electrical degrees of the phase from its ideal value of 90°e. 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 90°e or ¼ cycle. Ch B I I CODEWHEEL Gnd 3 Output Waveforms C P Channel A s2 s1 s3 s4 o Amplitude Channel B t1 Index t2 P0 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 Absolute Maximum Ratings Pin Signal Description Storage Temperature -40°C to 100°C PIN 1 Ch A Digital output Operating Temperature -25°C to 90°C PIN 2 Ch A’ Digital output Supply Voltage 4.5 V to 5.5 V PIN 3 Ground Ground Output Voltage -0.5 V to 5.5V PIN 4 Ch B Digital output Output Current per Channel -2.0 mA to 25 mA PIN 5 Ch B’ Digital output Frequency 100 kHz PIN 6 Vcc Input voltage PIN 7 Index Digital output PIN 8 Index’ Digital output 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 4 Parameter Symbol Min. Typical Max. Units Temperature TA 0 25 90 °C Supply Voltage VCC 4.5 5.0 5.5 Volts Notes Electrical Characteristics (over recommended operating conditions Typically at 25oC) Parameter Symbol Supply Current ICC High level Output Voltage VOH Low level Output Voltage VOL Min. Typical Max. Units 40 65 mA 2.4 0.2 Notes V IOH = -2 mA min. V IOL = 25 mA max 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 Symbol Typical Max. Units Pulse Width Error ∆P 7 70 °e State Width Error ∆S 15 60 °e Phase Error Df 15 60 °e Position Error DQ 40 120 arcmin Cycle Error ∆C 10 45 °e Index Pulse Width Po 90 120 °e Index rise time after Ch B fall t1 500 800 ns Index fall time after Ch A rise t2 150 500 ns Dimension/Details Tolerance Units 2, 3, 4 +/-.01 (+/-.0004) mm (in) 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 11.6 max 11.0 max Bolt Circle Diameter : Coupling plate Threaded mount 28.6 15.90 Mounting Screw Size: Coupling plate Threaded mount M2 M2x 3.5 mm Max axial load 0.3 kgf Max radial load 0.3 kgf Bearing life (based on the above loading) 2 x 10 10 rev Unit weight 22 gm Sealing (per IEC 529) IP50 Humidity 98% RH max Non condensing Vibration (per IEC 68-2-27) 20g @ 10 Hz ~ 500 Hz Shock (per IEC 68-2-27) 30 g @ 11ms mm +/-0.1 +/-0.05 mm 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. 6 APPLICATION NOTES Recommended gluing tool design Mares Mounting Recommendation Specifications Material Application specific, stainless steel shim plate in general Thickness Application specific, ~0.3mm in general Size Application specific Table 1 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. Motor shaft diameter, ± 0.01mm Recommended ∅X, +0.02/-0mm 2.00 2.02 3.00 3.02 4.00 4.02 7 Ordering Information HEDL - 64 - Channels 0 - 2 channel 4 - 3 channel Ribbon cable connection 2 Pigtail 3 Connector 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