Agilent AEDA-3200-Txx Series Ultra Miniature, High Resolution Incremental Encoders Data Sheet Features * Two channel quadrature output with index * Quick and easy assembly using Plug and Play tool Description The AEDA-3200-T series (top mounting type) are high performance, cost effective, three-channel optical incremental encoder modules. AEDA-3200-T series emphasize high reliability, high resolution and easy assembly, using transmissive encoder technology to sense rotary position. Outputs of the AEDA-3200 encoders are two channel quadrature outputs and a third channel gated index output. These encoder modules can be easily mounted to customer specific applications with the specially designed Plug and Play tool. * Cost-effective * Ultra miniature size (17 mm) 17.6 * Resolution options from 2500 to 10000 Cycles Per Revolution (CPR), up to 40000 counts with 4X decoding * Integrated RS 422 differential line driver 11 .4 17.0 Outline Drawing 2x5 - 1.27mm pitch pin (0.4mmx0.4mm) header Detector PCB 0.1 0.010 PDA Reticle Lens Codewheel Hub Emitter PCB 2 Theory of Operation The AEDA-3200 translates rotary motion of a shaft into a three channel digital output. The AEDA-3200 series has five key parts: a single light emitting diode (LED) light source, a photodetector IC with a set of uniquely configured photodiodes, an interpolator IC, a line driver IC and a pair of lenses. RESISTOR Vcc PHOTODIODES Ch A Ch A LE D Ch B SIGNAL PROCESSING CIRCUITRY LENS Ch B I This light is used to produce internal signals A and A-, and B and B-. I CODEWHEEL As part of the "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. Gnd The AEDA-3200 is available for cycles per revolution (CPR) of 2500 to 10000. This translates to a maximum resolution of 40000 counts after quadrature decode (4X). Output Waveforms AMPLITUDE C P 2.5 V 0.5V CH. A f S1 S2 S3 S4 2.5 V 0.5 V CH. B Po 2.5 V 0.5 V CH. I CH. I2.5 V 0.5 V CH. A2.5 V 0.5 V CH. B2.5 V 0.5 V CODEWHEEL ROTATION (Clockwise) 3 Definitions Count (N): N refers to the cycles per revolution (CPR) of the encoder output. Pulse Width Error (P): The deviation in electrical degrees of the pulse width from its ideal value of 180 e. One Cycle (C): 360 electrical degrees ( e). 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 1/4 cycle. One Shaft Rotation: 360 mechanical degrees, N cycles (rotary motion only). Phase (): 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. Pulse Width (P): The number of the electrical degrees that an output is a high-level during one cycle, nominally 180 e or 1/2 a cycle. 4 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. Direction of Motor Rotation When the codewheel rotates in a clockwise direction, channel A will lead channel B (Figure 1 illustrates the definition of clockwise direction of codewheel rotation). When the codewheel rotates in a counter-clockwise direction, channel B will lead channel A. Direction of codewheel rotation Figure 1. Viewed from the PCB encoder end. Absolute Maximum Ratings Storage Temperature -40C to 125C Operating Temperature -40C to 125C Supply Voltage 4.5 V to 5.5 V Output Voltage -0.5 V to Vcc Output Current per Channel 20 mA Frequency 1 MHz Recommended Operating Conditions Parameter Symbol Min. Typical Max. Units Temperature TA -40 25 125 C Supply Voltage VCC 4.5 5.0 5.5 Volts Ripple <100 mVp-p Frequency f 125 1000 kHz f = RPM x CPR 60 Maximum Frequency and RPM CPR Maximum Frequency (kHz) Maximum RPM 2500 1000 1 12000 5000 1000 12000 6000 1000 10000 7200 1000 8300 7500 1000 8000 8000 1000 7500 10000 1000 6000 Note: 1. Maximum frequency will be lower due to limitation in maximum RPM. 5 Notes Electrical Characteristics Electrical characteristics over recommended operating conditions. Typical values at 25oC. Parameter Symbol Supply Current ICC High level Output Voltage VOH Low level Output Voltage VOL Min. 2.5 Typical Max. Units 55 80 mA 3.4 V 0.3 0.5 V Encoding Characteristics Encoding characteristics over recommended operating conditions. Typical values at 25oC. Parameter Symbol Typical Max. Units Pulse Width Error P 5 85 e State Width Error S 5 60 e Phase Error 1 40 e Mechanical Characteristics (Refer to page 2 for details.) Parameter Dimension/Details Tolerance Units Standard Shaft Diameters 2 mm diameter maximum * +0/-.01 (+0/-.0005) mm (in) Mounting Screw Size: M2.5 x 0.45 (Recommended Length 6 mm) mm * Note: 1. Using a step shaft, maximum shaft diameter is 4 mm. 2. 000 Note: Tighter tolerance control will be better Baseplate 2.00 t o 4.00 7.00 Ma ximu m 6 Cod ewheel Hub Pin Assignments Pin Signal Description Pin 1 B+ Digital Output Pin 2 B- Digital Output Pin 3 Gnd Ground Pin Pin 4 Gnd Ground Pin Pin 5 A+ Digital Output Pin 6 A- Digital Output Pin 7 Vcc Input Voltage Pin 8 Vcc Input Voltage Pin 9 I+ Digital Output Pin 10 I- Digital Output 9 7 5 3 1 10 8 6 4 2 Notes: 1. Both Pin 7 and Pin 8 must be connected to Vcc. 2. Either Pin 3 or Pin 4 must be connected to Gnd. Mating Connector AEDA-3200 requires a 5 x 2 (1.27 mm x 1.27 mm) female IDC Connector. The cable used is 0.635 mm pitch flat ribbon cable. Electrical Interface Agilent recommends National Semiconductor DS26C32AM Quad Differential Line Receiver or compatible as line receiver. Unused pin should be grounded for noise reduction. Alignment Considerations The Plug and Play tool is intended to absorb normal installation misalignment and runouts. To achieve the optimum performance, user should minimize misalignment. Complete instruction for AEDA-3200 Plug and Play installation can be found in the AEDA-3200 application note. AEDA-3200 Plug and Play tool part number is HEDS-8940. 7 2 1 1A 1B 6 2A 7 2B 10 3A 9 3B 14 4A 15 4B Ch A+ Ch ACh B+ Ch BCh I+ Ch IAEDA-32xx Vcc 1k 1k 1Y 2Y 3Y A 5 B 11 I 4Y 13 12 G 4 G DS26C32AM Plug and Play tool. 3 1k Ordering Information AEDA-3200- T Resolution Options (CPR) AJ 2,500 B1 5,000 B7 6,000 BJ 7,200 BK 7,500 BM 8,000 C1 10,000 www.agilent.com/semiconductors For product information and a complete list of distributors, please go to our web site. For technical assistance call: Americas/Canada: +1 (800) 235-0312 or (916) 788-6763 Europe: +49 (0) 6441 92460 China: 10800 650 0017 Hong Kong: (65) 6756 2394 India, Australia, New Zealand: (65) 6755 1939 Japan: (+81 3) 3335-8152(Domestic/International), or 0120-61-1280(Domestic Only) Korea: (65) 6755 1989 Singapore, Malaysia, Vietnam, Thailand, Philippines, Indonesia: (65) 6755 2044 Taiwan: (65) 6755 1843 Data subject to change. Copyright (c) 2004 Agilent Technologies, Inc. December 7, 2004 5989-1389EN Counts After 4x Decoding 10,000 20,000 24,000 28,800 30,000 32,000 40,000