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AEDR-8310-1K0 Datasheet(PDF) 2 Page - Agilent(Hewlett-Packard) |
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AEDR-8310-1K0 Datasheet(HTML) 2 Page - Agilent(Hewlett-Packard) |
2 / 10 page 2 Theory of Operation The AEDR-8300 series combines an emitter and a detector in a single surface mount leadless package. When used with a codewheel or linear codestrip, the encoder translates rotary or linear motion into digital outputs. As seen in the block diagram, the AEDR-8300 consists of three major components: a light emit- ting diode (LED) light source, a detector IC consisting photo- diodes and lens to focus light beam from the emitter as well as light falling on the detector. The operation of the encoder is based on the principle of optics where the detector photodiodes sense the absence and presence of light. In this case, the rotary/ linear motion of an object being monitored is converted to equivalent light pattern via the use of codewheel/codestrip. As shown in the above diagram, the reflective area (window) of the codewheel (or codestrip) reflects light back to the photodetector IC, whereas no light is reflected by the non-reflective area (bar). An alternating light and dark patterns corresponding to the window and bar fall on the photodiodes as the codewheel rotates. The moving light pattern is exploited by the detector circuitry to produce digital outputs representing the rotation of the codewheel. When the codewheel is coupled to a motor, the encoder outputs is then a direct representation of the motor rotation. The same con- cept applies to the use of a codestrip to detect linear motion. Definitions State Width (S) : The number of electrical degrees between a transition in Channel A and the neighboring transition in Chan- nel B. There are 4 states per cycle, each nominally 90oe. State Width Error ( ∆S): The deviation of state width, in electrical degree, from its ideal value of 90oe. Phase ( φ): The number of electri- cal degrees between the center of high state of Channel A and the center of high state of Channel B. Nominally 90oe. Phase Error ( ∆φ): The deviation of phase, in electrical degree, from its ideal value of 90oe. Pulse Width (P) : The duration of high state of the output, in electrical degree, within one cycle. Nominally 180oe or half a cycle. Pulse Width Error ( ∆P): The deviation of pulse width, in electrical degree, from its ideal value of 180oe. Count (N) : The number of window and bar pair per revolu- tion (CPR) of codewheel. For linear codestrip, defined as the number of window and bar pair per unit length (lines per inch [LPI] or lines per mm [LPmm]). One Cycle (C) : 360 electrical degrees (oe). Equivalent to one window and bar pair. One Shaft Rotation : 360 me- chanical degrees. Also equivalent to N counts (codewheel only). Line Density : The number of window and bar pair per unit length, expressed in either lines per inch (LPI) or lines per mm (LPmm). Optical radius (Rop) : The distance between the codewheel center and the centerline be- tween the two domes of the encoder. Figure 1. Block Diagram of AEDR-8300. VLED GND VCC CH A CH B GND SIGNAL PROCESSING CIRCUITRY R CODEWHEEL OR CODESTRIP |
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