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HEDL-64xx Dataheets PDF



Part Number HEDL-64xx
Manufacturers Hewlett-Packard
Logo Hewlett-Packard
Description Optical Incremental Housed Encoders
Datasheet HEDL-64xx DatasheetHEDL-64xx Datasheet (PDF)

www.DataSheet4U.com 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 • -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 Description The HEDL- 64XX series are high .

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www.DataSheet4U.com 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 • -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 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 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. 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 -40°C to 100°C -25°C to 90°C 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 Param.


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