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HEDL-6402-IP11 Datasheet(PDF) 3 Page - Agilent(Hewlett-Packard) |
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HEDL-6402-IP11 Datasheet(HTML) 3 Page - Agilent(Hewlett-Packard) |
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3 / 8 page  3 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 LENS LED Vcc Gnd Ch A Ch A Ch B Ch B I I RESISTOR PHOTODIODE SIGNAL PROCESSING CIRCUITY CODEWHEEL 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. |
Similar Part No. - HEDL-6402-IP11 |
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Similar Description - HEDL-6402-IP11 |
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