180, 300, Small Optical Encoder Modules HEDS-974x series high per
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HEDS-974x Series
180, 300, Small Optical Encoder Modules
HEDS-974x series high performance, cost, optical incremental encoder module. When operated conjunction with codestrip, this module detects linear position. module consists lensed source detector enclosed small C-shaped plastic package. highly collimated light source unique photodetector array, module extremely tolerant mounting misalignment. two-channel digital outputs supply input accessed through four solder-plated leads located 2.54 (0.1 inch) centers. This consists multiple sets photodetectors signal processing circuitry necessary produce digital waveforms. codestrip moves between emitter detector, causing light beam interrupted pattern spaces bars codestrip. photodiodes which detect these interruptions arranged pattern that corresponds count density codestrip. These detectors also spaced such that light period pair detectors corresponds dark period adjacent pair detectors. photodiode outputs through signal processing circuitry. comparators receive these signals produce final outputs channels this integrated phasing technique, digital output channel quadrature with channel degrees phase).
Applications
HEDS-974x provides sophisticated motion detection cost, making close-loop control very costcompetitive! Typical applications include printers, plotters, copiers, office automation equipment. Note: Agilent Technologies encoders recommended safety critical applications. braking systems, power steering, life support systems critical care medical equipment. Please contact sales representative more clarification needed.
Features
Small size Multiple mounting options Wide resolution range Linear options available signal adjustment required Insensitive radial axial play -40°C +85°C operating temperature High resolution version HEDS-970x Two-channel quadrature output CMOS compatible Single supply Wave solderable Integrated pullup outputs
Theory Operation
HEDS-974x C-shaped emitter/detector module. Coupled with codewheel, translates rotary motion into two-channel digital output. Coupled with codestrip, translates linear motion into digital outputs. seen block diagram, module contains single Light Emitting Diode (LED) light source. light collimated into parallel beam means single lens located directly over LED. Opposite emitter integrated detector circuit.
WARNING: NORMAL PRECAUTIONS SHOULD TAKEN AVOID STATIC DISCHARGE.
Definitions Count number window pairs Counts Revolution (CPR) codewheel, number Lines Inch (LPI) codestrip. Shaft Rotation mechanical degrees cycles Cycle electrical degrees (°e) window pair Pulse Width (P): number electrical degrees that output high during cycle. This value nominally 180°e cycle. Pulse Width Error (P): deviation, electrical degrees, pulse width from ideal value 180°e.
State Width (S): number electrical degrees between transition output channel neighboring transition output channel There four states cycle, each nominally 90°e. State Width Error (S): deviation, electrical degrees, each state width from ideal value 90°e. Phase number electrical degrees between center high state channel center high state channel This value nominally 90°e quadrature output. Phase Error deviation phase from ideal value 90°e.
Direction Rotation: When codewheel rotates counterclockwise, viewed looking down module marking visible), channel will lead channel codewheel rotates opposite direction, channel will lead channel Optical Radius (ROP): distance from codewheel's center rotation optical center (OC) encoder module. Angular Misalignment Error (EA): Angular misalignment sensor relation tangential direction. This applies both rotary linear motion. Mounting Position (RM): Distance from motor shaft center rotation center alignment receiving hole.
Absolute Maximum Ratings Parameter Storage Temperature Operating Temperature Supply Voltage Output Voltage Output Current Channel Soldering Temperature Symbol Min. -0.5 -0.5 -1.0 Max. Units sec. Notes
Recommended Operating Conditions Parameter Temperature Supply Voltage Symbol Min. Typ. Max. Units Ripple mVp-p. Recommended bypass capacitor between less than from encoder. Recommended pullup. Device integrated outputs. -2.0 +2.0 deg. (Velocity (rpm) Mounting considerations. Notes
Load Capacitance Pullup Resistor Count Frequency
none
Angular Misalignment
Electrical Characteristics over Recommended Operating Range, Typical 25°C Parameter Supply Current High Level Output Voltage Level Output Voltage Rise Time Fall Time Symbol Min. Typ. Max. Units -200 pullup) Notes
Encoding Characteristics Encoding Characteristics over Recommended Operating Range Recommended Mounting Tolerances. These characteristics include codewheel/codestrip contribution. Typical Values averages over full rotation codewheel. Parameter Pulse Width Error Logic State Width Error Phase Error Symbol Typical Maximum Units
Recommended Codewheel Codestrip Characteristics
Parameter Window/Bar Ratio Center Post Inside Edge Window Center Post Outside Edge Window Center Post Inside Edge Codestrip
Symbol Ww/Wb
Min. 1.04 (0.041) 0.76 (0.030)
Max.
Units (inch) (inch) (inch)
Notes
3.60 (0.142)
Mounting Considerations
4.44 0.13 0.175 0.005
IMAGE SIDE CODEWHEEL/CODESTRIP
linear motion, angular misalignment, must degrees achieve Encoding Characteristics. dimensions mounting module codestrip should measured with respect mounting posts, shown above.
Recommended Screw Size: M2.5 0.45 2-56
Recommended Wave Solder Conditions Flux Water Soluble (per MIL-F-14256D) Process Parameters Flux Pre-heat seconds total Nominal preheat temp: 90°C Min: 85°C Max: 110°C Solder Zone Nominal time: seconds Min: seconds Max: seconds side: -160°C bottom side: 260°C Wave Solder 255°C, meters/minute line speed Water Wash 1st: 30°C seconds 2nd: 70°C seconds Rinse 1st: 23°C seconds 2nd: 23°C seconds 1st: 80°C seconds 2nd: 95°C seconds Package Dimensions Mounting Option
LEAD THICKNESS 0.25 LEAD PITCH 2.54
Ordering Information HEDS-974 Option
Lead Bend Straight Leads Bend Leads
Resolution Options LPI, linear LPI, linear LPI, linear
Mounting Options Standard
HEDS-9740
HEDS-9741
10.8 OPTION CODE
0.50
AGILENT XXXXX
12.6
6.40
0.14 (OPTICAL CENTER) 2.00 0.03 10.1
1.70 0.22 3.90 0.15 PART
15.0
YYWW
DATE CODE
COUNTRY ORIGIN 20.2
Note: specified, tolerances 0.7, xx.x 0.3, xx.xx 0.07
product information complete list distributors, please website:
www.avagotech.com
Avago, Avago Technologies, logo trademarks Avago Technologies Limited United States other countries. Data subject change. Copyright 2008 Avago Technologies Limited. rights reserved. Obsoletes 5988-6067 5988-8042EN January 2008
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