HEDS-9731

HEDS-9730, HEDS-9731 Small Optical Encoder Modules 480lpi Digital Output Data Sheet Description The HEDS-973X is a high performance incremental encoder module. When operated in conjunction with either a codewheel or codestrip, this module detects rotary or linear position. The encoder consists of a lensed LED source and a detector IC enclosed in a small Cshaped 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 3.3V supply input are accessed through four solder plated leads located on 2.54mm (0.1inch) centers. The standard HEDS-973X is designed for use with an appropriate optical radius codewheel or linear codestrip. Other options are available. Please contact the factory for more information. Features • Small Size • High Resolution • Two Channel Quadrature Output • Linear and Rotary Applications • No Signal Adjustment required • T TL or 3.3V/5V CMOS Compatible • Wave Solderable • Lead-free Package • -40°C to 85°C Operating Temperature • Single 3.3V Supply Applications The HEDS-973X provides sophisticated motion detection, making closed loop control very cost competitive. Typical applications include printers, plotters, copiers and office automation equipment. Note: Avago Technologies’ encoders are not recommended for use in safety critical applications, e.g., ABS braking systems and critical-care medical equipment. Please contact a sales representative if more clarification is needed. Block Diagram RESISTOR LENS PHOTODIODES COMPARATORS A + AB + VCC 3 CHANNEL A 2 CHANNEL B 4 LED BSIGNAL PROCESSING CIRCUITRY GND 1 EMITTER SECTION CODE WHEEL DETECTOR SECTION Figure 1 ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.  Theory of Operation A HEDS-973X is a C-shaped emitter/detector module. Coupled with a codewheel, it translates rotary motion into a two-channel digital output; coupled with a codestrip, it translates linear motion into digital outputs. As seen in Figure 1, the module contains a single Light Emitting Diode (LED) as its light source. The light is collimated into 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 photodetectors and a 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 photodiodes are also spaced such that a light period on one pair of detectors corresponds to a dark period on the adjacent pairs of detectors. The photodiode outputs are fed through the signal processing circuitry. Two comparators receive these signal and produce the final outputs for Channels A and B. Due to this integrated phasing technique the output of channel A is in quadrature with Channel B (90 degrees out of phase). Definitions Note: Refer to Figure 2 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 degrees = N cycles 1 cycle (c) = 360 electrical degree, equivalent to 1 bar and window pair. Pulse Width (P): The number of electrical degrees that an output is high during one cycle, nominally 180°e or 1/2 a cycle. Pulse Width Error (DP): The deviation in electrical degrees of the pulse width from its ideal value of 180°e. 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 90°e. State Width Error (DS): 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 channel A and the center of the high state on channel B. This value is nominally 90°e for quadrature output. Phase Error (Df): The deviation in electrical degrees of the phase from its ideal value of 90°e. Direction of Rotation: When the codewheel rotates in the counter-clockwise direction (as viewed from the encoder end of the motor), channel A will lead channel B. If the codewheel rotates in the clockwise 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 then 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. Output Waveforms Figure 2.  Absolute Maximum Ratings Parameter Storage Temperature Operating Temperature Supply Voltage Output Voltage Output Current per Channel Soldering Temperature Symbol TS TA VCC VO IOUT TSOL Min. -40 -40 -0.5 -0.5 -.5 0 Max. 85 85 7 VCC 9 60 Units °C °C Volts Volts mA °C t* 5 sec Notes Recommended Operating Conditions Parameter Temperature Supply Voltage Load Capacitance Pull-up Resistor Frequency Angular Misalignment Mounting Position Symbol TA VCC CL RL f EA RM -.0 0.0 ROP-0.4 (ROP -0.006) none 40 +.0 kHz Deg. Min. -40 .8 . or 5 Typ. Max. 85 5. 00 Units °C Volts pF Recommend no pullup. Device has integrated .5 kW on outputs Velocity (rpm) x N/60 Refer to Mounting Consideration Ripple < 00mVp-p Notes Mm (inch) Refer to Mounting Consideration Electrical Characteristics Electrical Characteristics Over the Recommended Operating Conditions. Typical Values at 25°C. Parameter Supply Current High Level Output Voltage Low Level Output Voltage Rise Time Fall Time Symbol ICC VOH VOL tr tf 00 50 Min.  .4 Typ. 5 55 Max. 40 85 Volts Units mA Notes Typ. .V Typ. 5V When VOH = .4V (Min)Typ. IOH = -0.4 mA @ .VTyp. IOH = -.0 mA @ 5V When VOL = 0.4V (Max)Typ. IOL =  mA @ .VTyp. IOL = 4 mA @ 5V CL=25 pF 0.4 Volts ns ns Encoding Characteristics Encoding Characteristics Over the Recommended Operating Conditions and Mounting Conditions These characteristics do not include codewheel/codestrip contribution. The typical values are average over the full rotation of the codewheel Parameter Pulse Width Error State Width Error Phase Error Symbol DP DS Df Typical 5   Maximum 50 50 5 Units °e °e °e Notes  Mounting Considerations 5.32 MAX. (0.209) 4.40 ± 0.13 0.17 ± 0.005 SEE NOTE 1 Rm IMAGE SIDE OF CODEWHEEL/CODESTRIP Rop C OF ALIGNMENT TAB L 6.30 MAX. (0.248) 6.50 MIN. (0.256) CENTER OF ROTATION MOTOR SHAFT CENTER -A- 2.03 MIN. (0.080) 1.0 DEEP MIN. (0.039) 2X R EA Rm = Rop - 0.14 (0.006) ALIGNMENT TAB RECEIVING HOLE � 2.03 HOLE MIN. (0.080) 1.0 DEEP MIN. (0.039) A 0.13 mm (0.005") DIMENSIONS IN MILLIMETERS (INCHES). Note: These dimensions include shaft end play and codewheel warp. For both rotary and linear motion, angular misalignment, EA must be * ± 1 degrees to achieve Encoding Characteristics. All dimension for mounting the module and codewheel/codestrip should be measured with respect to two mounting posts, as shown above Recommended Codewheel and Codestrip Characteristics MAX 3.4 (0.134) Wb Lw Ww Rc Rop W1 W2 Ww Wb L 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 W W L Min. 0.9 .80 (0.07) Max. . . (0.09) Rop + .40 (Rop + 0.4) Unit mm (inch) mm (inch) mm (inch) mm (inch) Notes Includes eccentricity errors .04 (0.04) 0.76 (0.06) .60 (0.4) mm (inch) 4 Ordering Information HEDS - 973 Option Resolution 3 - 480 LPI Bracket Option 50 Lead Configurations 0 - Straight leads 1 - Bent leads Package Dimension Option 50 LEAD THICKNESS = 0.25 mm LEAD PITCH = 2.54 mm 3.8 0.5 5.5 ± 0.3 1.4 6.4 3.9 0.8 4.2 7.5 10.1 3.90 ± 0.10 1.70 ± 0.15 PART # (REFER -05) 5.0 4.2 R 1.4 R 2.6 3.0 OPTION CODE AVAGO XXXXX X 10.8 ± 0.5 CH B CH A GND V CC PIN 1 ID 7.0 12.6 ± 0.5 50 8.7 0.14 (OPTICAL CENTER) 2x ∅ 2.00 ± 0.02 C 8.4 15.0 YYWW DATE CODE C = COUNTRY OF ORIGIN MARKING (REFER -05 FOR DETAILS) 1.8 20.2 ± 0.5 9.8 Bent Version - Option 50 LEAD THICKNESS = 0.25 mm LEAD PITCH = 2.54 mm R 2.6 1.4 6.4 3.9 0.8 4.2 7.5 10.1 3.90 ± 0.10 1.8 1.70 ± 0.15 PART # (REFER -05) 5.0 R 1.4 6.0 3.0 ± 0.3 CH B CH A GND V CC 5° TYP. OPTION CODE PIN 1 ID 7.0 12.6 ± 0.5 8.7 9.2 ± 0.3 AVAGO XXXXX 4.2 X C 8.4 15.0 20.2 ± 0.5 0.14 (OPTICAL CENTER) 2x ∅ 2.00 ± 0.02 YYWW 50 DATE CODE C = COUNTRY OF ORIGIN MARKING (REFER -05 FOR DETAILS) 3.8 0.5 10.8 ± 0.5 9.8 5 Wave Soldering Profile 7 sec MAX. 260°C Y- AXIS FLOW 120° C/20 sec MAX. X- AXIS COOL DOWN Parameter A B C D E Solder Pot Temperature Preheat Zone Temperature Dip in Time Solder Pot Zone (PCB Top) Solder Pot Zone (Encoder Lead) Min. NA 85 5 NA 00 Max. 60 0 7 NA NA Nominal values 50 - 60 00 - 0 5 NA ≥ 00 Units °C °C sec °C °C For product information and a complete list of distributors, please go to our web site: www.avagotech.com Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies Limited in the United States and other countries. Data subject to change. Copyright © 008 Avago Technologies Limited. All rights reserved. Obsoletes 5989-087EN AV0-057EN - February , 008