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Agilent HEDS-974x Series for 180, 300, 360 LPI Small Optical Encoder Modules
Data Sheet
Description The HEDS-974x series is a high performance, low cost, optical incremental encoder module. When operated in conjunction with codestrip, this module detects 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. Applications The HEDS-974x provides sophisticated motion detection at a low cost, making close-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. Theory of Operation The HEDS-974x 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 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 codestrip moves between the emitter and detector, causing the light beam to be interrupted by the pattern of spaces and bars on the codestrip. The photodiodes which detect these interruptions are arranged in a pattern that corresponds to the count density of the
Features * Small size * Multiple mounting options * Wide resolution range * Linear 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 or 5.0 V CMOS compatible * Single 5 V supply * Wave solderable * Integrated 2.5 K pullup on outputs
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).
ESD WARNING: NORMAL PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.
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 (LPI) of the codestrip. 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 four 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. 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 (OC) 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.
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. -40 -40 -0.5 -0.5 -1.0 Max. 85 85 7 VCC 5 260 Units C C V V mA C t 5 sec. Notes
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Recommended Operating Conditions Parameter Temperature Supply Voltage Symbol T VCC Min. -40 4.5 5.0 Typ. Max. 85 5.5 Units C V Ripple < 100 mVp-p. Recommended one bypass capacitor (1 F) between V CC and GND less than 15 cm from the encoder. Recommended no pullup. Device has integrated 2.5 k on outputs. 40 -2.0 0 +2.0 kHz deg. (Velocity (rpm) x N) / 60 Mounting considerations. Notes
Load Capacitance Pullup Resistor Count Frequency
CL RL none
100
pF
Angular Misalignment EA
Electrical Characteristics over Recommended Operating Range, Typical at T Parameter Supply Current High Level Output Voltage Low Level Output Voltage Rise Time Fall Time Symbol I CC VOH VOL tr tf 70 45 Min. 12 2.4 Typ. 21
A = 25C
Max. 40 0.4
Units mA V V ns ns
Notes IOH = -200 A IOL = 3.2 mA CL = 25 pF RL = (NO pullup)
Encoding Characteristics Encoding Characteristics over Recommended Operating Range and Recommended Mounting Tolerances. These characteristics do not include codewheel/codestrip contribution. The Typical Values are averages over the full rotation of the codewheel. Parameter Pulse Width Error Logic State Width Error Phase Error Symbol P S Typical 5 3 2 Maximum 40 40 15 Units e e e
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Recommended Codewheel and Codestrip Characteristics
Parameter Window/Bar Ratio 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 W1 W2 L
Min. 0.7 1.04 (0.041) 0.76 (0.030)
Max. 1.4
Units mm (inch) mm (inch) mm (inch)
Notes
3.60 (0.142)
Mounting Considerations
4.44 0.13 0.175 0.005
Rm
IMAGE SIDE OF CODEWHEEL/CODESTRIP
EA
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
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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 Package Dimensions Mounting Option #50
LEAD THICKNESS = 0.25 mm LEAD PITCH = 2.54 mm 3.8
Ordering Information HEDS-974 Option
Lead Bend 0 - Straight Leads 1 - Bend Leads
Resolution Options Q - 180 LPI, linear 2 - 300 LPI, linear 1 - 360 LPI, linear
Mounting Options 50 - Standard
HEDS-9740
HEDS-9741
Q 2 1 Q 2 1
50 * * * *
51
52
53
54
55
10.8 0.7 CH B R 1.4 5.5 0.4 R 2.6 OPTION CODE 8.7
1.4
3.0
GND
VCC
0.50
CH A
PIN 1 ID
AGILENT XXXXX 5.0 4.2 X
50
7.0 12.6 0.7
6.40 3.9
0.14 (OPTICAL CENTER) 2x 2.00 0.03 4.2 7.5 10.1
0.8 1.70 0.22 3.90 0.15 PART #
8.4 15.0
C
YYWW
DATE CODE
C = COUNTRY OF ORIGIN 20.2 0.7 1.8
9.8
Note: If not specified, tolerances are xx. 0.7, xx.x 0.3, xx.xx 0.07 mm.
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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 5988-6067EN October 2, 2002 5988-8042EN

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