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| Small Optical Encoder Modules Technical Data HEDS-973x Series Features * Small Size * Low Cost * Multiple Mounting Options * Wide Resolution Range * Linear and Rotary Options Available * No Signal Adjustment Required * Insensitive to Radial and Axial Play * - 40C to +85C Operating Temperature * High Resolution Version of the HEDS-970x * Two Channel Quadrature Output * TTL Compatible * Single 5 V Supply * Wave Solderable Description The HEDS-973x series is a high performance, low cost, optical incremental encoder module. When operated in conjunction Package Dimensions Mounting Option #50 - Standard (Baseplane Mounting) Contact Factory for Detailed Package Dimensions ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE. 2 with either a codewheel or codestrip, this module detects rotary or linear position. The module consists of a lensed LED source and a detector IC enclosed in a small C-shaped plastic package. Due to a highly collimated light source and a unique photodetector array, the module is extremely tolerant to mounting misalignment. The two channel digital outputs and 5 V supply input are accessed through four solder-plated leads located on 2.54 mm (0.1 inch) centers. The standard HEDS-973x is designed for use with an 11 mm optical radius codewheel, or linear codestrip. Other options are available. Please contact factory for more information. Applications The HEDS-973x provides sophisticated motion detection at a low cost, making closed-loop control very cost-competitive! Typical applications include printers, plotters, copiers, and office automation equipment. . Note: Agilent Technologies encoders are not recommended for use in safety critical applications. Eg. ABS braking systems, power steering, life support systems and critical care medical equipment. Please contact sales representative if more clarification is needed. rotary motion into a two-channel digital output. Coupled with a codestrip, it translates linear motion into a digital output. As seen in the block diagram, the module contains a single Light Emitting Diode (LED) as its light source. The light is collimated into a parallel beam by means of a single lens located directly over the LED. Opposite the emitter is the integrated detector circuit. This IC consists of multiple sets of photodetectors and the signal processing circuitry necessary to produce the digital waveforms. The codewheel/codestrip moves between the emitter and detector, causing the light beam to be interrupted by the pattern of spaces and bars on the codewheel/codestrip. The photodiodes which detect these interruptions are arranged in a pattern that corresponds to the radius and count density of the codewheel/codestrip. These detectors are also spaced such that a light period on one pair of detectors corresponds to a dark period on the adjacent pair of detectors. The photodiode outputs are fed through the signal processing circuitry. Two comparators receive these signals and produce the final outputs for channels A and B. Due to this integrated phasing technique, the digital output of channel A is in quadrature with channel B (90 degrees out of phase). Theory of Operation The HEDS-973X is a C-shaped emitter/detector module. Coupled with a codewheel, it translates Block Diagram 3 Output Waveforms Phase (): The number of electrical degrees between the center of the high state of channel A and the center of the high state of channel B. This value is nominally 90e for quadrature output. Phase Error (): The deviation of the phase from its ideal value of 90e. Direction of Rotation: When the codewheel rotates counterclockwise, as viewed looking down on the module (so the marking is visible), channel A will lead channel B. If the codewheel rotates in the opposite direction, channel B will lead channel A. Optical Radius (Rop): The distance from the codewheel's center of rotation to the optical center (O.C.) of the encoder module. Angular Misalignment Error (EA ): angular misalignment of the sensor in relation to the tangential direction. This applies for both rotary and linear motion. Mounting Position (RM): Distance from Motor Shaft center of rotation to center of Alignment Tab receiving hole. Definitions Count (N) = The number of bar and window pairs or counts per revolution (CPR) of the codewheel, or the number of lines per inch of the codestrip (LPI). 1 Shaft Rotation = 360 mechanical degrees = N cycles 1 cycle (c) = 360 electrical degrees (e) = 1 bar and window pair Pulse Width (P): The number of electrical degrees that an output is high during one cycle. This value is nominally 180e or 1/2 cycle. Pulse Width Error (P): The deviation, in electrical degrees, of the pulse width from its ideal value of 180e. State Width (S): The number of electrical degrees between a transition in the output of channel A and the neighboring transition in the output of channel B. There are 4 states per cycle, each nominally 90e. State Width Error (S): The deviation, in electrical degrees, of each state width from its ideal value of 90e. 4 Absolute Maximum Ratings Parameter Storage Temperature Operating Temperature Supply Voltage Output Voltage Output Current per Channel Soldering Temperature Symbol TS TA VCC VO IO Min. Max. Units -40 -40 -0.5 -0.5 -1.0 85 70 85 70 7 VCC 5 260 C C V V mA C t 5 sec. Notes Option A & Q All Other Options Option A & Q All Other Options Recommended Operating Conditions Parameter Temperature Supply Voltage Load Capacitance Count Frequency Angular Misalignment Mounting Position EA RM -2.0 0.0 ROP -0.14 (ROP -0.006) Symbol T VCC CL Min. -40 4.5 5.0 Typ. Max. 85 70 5.5 100 40 +2.0 Units C V pF kHz deg. mm mm (in.) (inch) Shaft c 0.13 mm (0.005") L Notes Option A & Q All Other Options Ripple < 100 mVp-p 3.2 k pull-up (Velocity (rpm) x N)/60 See Mounting Considerations Note: The module performance is specified at 40 kHz but can operate at higher frequencies. Electrical Characteristics Electrical Characteristics over Recommended Operating Range, Typical at 25C. Parameter Supply Current High Level Output Voltage Low Level Output Voltage Rise Time Fall Time Symbol ICC VOH VOL tr tf 180 40 2.4 0.4 Min. Typ. 17 57 Max. 40 mA 85 V V ns ns All Other Options IOH = -200 A IOL = 3.86 mA C L = 25 pF, RL = 3.3 k pull-up Units Notes Option A & Q 5 Encoding Characteristics Encoding Characteristics over Recommended Operating Condition and recommended mounting tolerances. These characteristics do not include codewheel/codestrip contribution. The Typical Values are averages over the full rotation of the codewheel. For operation above 40 kHz, see frequency derating curves. Parameter Pulse Width Error Logic State Width Error Phase Error Symbol P S Typical 5 3 2 Maximum 45 45 15 Units e e e Note: 3.3 k pull-up resistors used on all encoder module outputs. Frequency Derating Curves Typical performance over extended operating range. These curves were derived using a 25 pF load with a 3.3 k pull-up resistor. Greater load capacitances will cause more error than shown in these graphs. A 0 CHANGE IN PULSE WIDTH ERROR (ELECTRICAL DEGREES) CHANGE IN STATE WIDTH ERROR (ELECTRICAL DEGREES) B 15 -40 C 10 +25 C 5 +85 C 0 +85 C -5 +25 C -40 C -10 -15 0 50 100 150 200 FREQUENCY (KHz) -5 0 50 100 150 200 FREQUENCY (KHz) 6 Recommended Codewheel and Codestrip Characteristics Parameter Window/Bar Ratio Window Length (Rotary) Absolute Maximum Codewheel Radius (Rotary) Center of Post to Inside Edge of Window Center of Post to Outside Edge of Window Center of Post to Inside Edge of Codestrip Symbol Ww/Wb Lw Rc W1 W2 L Min. 0.7 1.80 (0.071) Max. 1.4 2.30 (0.091) Rop + 3.40 (Rop + 0.134) Units Notes mm (inch) mm (inch) mm (inch) mm (inch) Includes eccen- tricity errors 1.04 (0.041) 0.76 (0.030) 3.60 (0.142) mm (inch) Optional Packages Available 3.8 0.150 0.50 0.020 (OPTICAL CENTER) 2.8 0.110 3.0 0.118 0.8 0.031 hp 10.8 0.425 CH B CH A GND VCC PIN 1 IDENTIFIER 5.5 0.217 YYWW * 0.14 0.006 7.5 0.295 10.1 0.398 3.9 0.152 1.7 0.067 H97X0 6.40 0.252 X 51 7.0 0.276 12.6 0.496 4.34 0.171 4.2 0.167 2X 2.00 0.079 3.9 0.154 15.0 0.591 20.2 0.795 1.8 0.071 LEAD THICKNESS: 0.25 0.010 9.8 0.386 DIMENSIONS ARE MILLIMETERS INCHES Mounting Option #51 - Screwmount (Baseplane Mounting) 7 Optional Packages Available (cont'd.) Mounting Option #52 - Backplane (Backplane Mounting) Mounting Option #53 - Standard with Posts (Baseplane Mounting) 8 Optional Packages Available (cont'd.) Mounting Option #54 - Tabless (Baseplane Mounting) Mounting Option #55 - Backplane with Posts (Backplane Mounting) 9 Bent Lead Option Mounting Considerations 4.44 0.13 0.175 0.005 Rm IMAGE SIDE OF CODEWHEEL/CODESTRIP CENTER OF ROTATION MOTOR SHAFT CENTER -A- EA ALIGNMENT TAB RECEIVING HOLE A 0.13 mm (0.005") For linear motion, angular misalignment, EA, must be 2 degrees to achieve Encoding Characteristics. All dimensions for mounting the module and codestrip should be measured with respect to the two mounting posts, shown above. Recommended Screw Size: M2.5 x 0.45 or 2-56 10 Recommended Wave Solder Conditions Flux - RMA Water Soluble (per MIL-F-14256D) Process Parameters 1. Flux 2. Pre-heat 60 seconds total Nominal preheat temp: 90C Min: 85C Max: 110C 3. Solder Pot Zone Nominal dip in time: 2.5 - 4.5 seconds Min: 2.5 seconds Max: 5 seconds PCB top side: 140 -160C PCB bottom side: 240 - 260C 4. Wave Solder 255C, 1.2 meters/minute line speed 5. Hot Water Wash 1st: 30C 45 seconds 2nd: 70C 90 seconds 6. Rinse 1st: 23C 45 seconds 2nd: 23C 45 seconds 7. Dry 1st: 80C 105 seconds 2nd: 95C 105 seconds 11 Ordering Information HEDS-973 Option Lead Bend 0 - Straight Leads 1 - Bent Leads 2 - Straight Leads 3 - Bent Leads Resolution Options A - 500 CPR, 11 mm Rop B - 1000 CPR, 11 mm Rop J - 1024 CPR, 11 mm Rop Q - 180 LPI, Linear 2 - 300 LPI, Linear 1 - 360 LPI, Linear T - 2000 CPR, 23.36 mm Rop U - 2048 CPR, 23.36 mm Rop Mounting Options 50 - Standard 51 - Screwmount 52 - Backplane 53 - Standard w/Posts 54 - Tabless 55 - Backplane w/Posts Note: Please contact factory for codewheel and codestrip information. 50 HEDS-9730 A Q 2 1 B J HEDS-9731 A Q 2 1 B J HEDS-9732/33 T U * * * * * * * * * * * 51 52 * 53 54 * 55 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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 (408) 654-8675 Europe: +49 (0) 6441 92460 China: 10800 650 0017 Hong Kong: (+65) 6271 2451 India, Australia, New Zealand: (+65) 6271 2394 Japan: (+81 3) 3335-8152(Domestic/International), or 0120-61-1280(Domestic Only) Korea: (+65) 6271 2194 Malaysia, Singapore: (+65) 6271 2054 Taiwan: (+65) 6271 2654 Data subject to change. Copyright (c) 2002 Agilent Technologies, Inc. Obsoletes 5988-5852EN October 2, 2002 5988-8044EN |
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