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Quick Assembly Two and Three Channel Optical Encoders Technical Data
HEDM-550x/560x HEDS-550x/554x HEDS-560x/564x
HEDS-5500/5600 and HEDM5500/ 5600 are two square waves in quadrature. The HEDS-5540 and 5640 also have a third channel index output in addition to the two channel quadrature. This index output is a 90 electrical degree, high true index pulse which is generated once for each full rotation of the codewheel. The HEDS series utilizes metal codewheels, while the HEDM series utilizes a film codewheel allowing for resolutions to 1024 CPR. The HEDM series is nont available with a third channel index. These encoders may be quickly and easily mounted to a motor. For larger diameter motors, the HEDM-5600, and HEDS-5600/ 5640 feature external mounting ears. The quadrature signals and the index pulse are accessed through five 0.025 inch square pins located on 0.1 inch centers. Standard resolutions between 96 and 1024 counts per revolution are presently available. Consult local Agilent sales representatives for other resolutions.
Features
* Two Channel Quadrature Output with Optional Index Pulse * Quick and Easy Assembly * No Signal Adjustment Required * External Mounting Ears Available * Low Cost * Resolutions Up to 1024 Counts Per Revolution * Small Size * -40C to 100C Operating Temperature * TTL Compatible * Single 5 V Supply
Applications
The HEDS-5500, 5540, 5600, 5640, and the HEDM-5500, 5600 provide motion detection at a low cost, making them ideal for high volume applications. Typical applications include printers, plotters, tape drives, positioning tables, and automatic handlers. 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.
Description
The HEDS-5500/5540, HEDS5600/5640, and HEDM-5500/ 5600 are high performance, low cost, two and three channel optical incremental encoders. These encoders emphasize high reliability, high resolution, and easy assembly. Each encoder contains a lensed LED source, an integrated circuit with detectors and output circuitry, and a codewheel which rotates between the emitter and detector IC. The outputs of the
ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.
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Package Dimensions
HEDS-5500/5540, HEDM-5500
*Note: For the HEDS-5500 and HEDM-5500, Pin #2 is a No Connect. For the HEDS-5540, Pin #2 is CH. I, the index output.
HEDS-5600/5640, HEDM-5600
*Note: For the HEDS-5600 and HEDM-5600, Pin #2 is a No Connect. For the HEDS-5640, Pin #2 is CH. I, the index output.
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Theory of Operation
The HEDS-5500, 5540, 5600, 5640, and HEDM-5500, 5600 translate the rotary motion of a shaft into either a two- or a threechannel digital output. As seen in the block diagram, these encoders contain a single Light Emitting Diode (LED) as its light source. The light is collimated into a parallel beam by means of a single polycarbonate 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 rotates between the emitter and detector, causing the light beam to be interrupted by the pattern of spaces and bars on the codewheel. The photodiodes which detect these interruptions are arranged in a pattern that corresponds to the radius and design of the codewheel. 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 then fed through the signal processing circuitry resulting in A, A, B and B (also I and I in the HEDS-5540 and 5640). 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 that of channel B (90 degrees out of phase). In the HEDS-5540 and 5640, the output of the comparator for I and I is sent to the index processing circuitry along with the outputs of channels A and B.
Block Diagram
The final output of channel I is an index pulse PO which is generated once for each full rotation of the codewheel. This output PO is a one state width (nominally 90 electrical degrees), high true index pulse which is coincident with the low states of channels A and B.
revolution. Pulse Width (P): The number of electrical degrees that an output is high during 1 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. 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.
Definitions
Count (N): The number of bar and window pairs or counts per revolution (CPR) of the codewheel. One Cycle (C): 360 electrical degrees (e), 1 bar and window pair. One Shaft Rotation: 360 mechanical degrees, N cycles. Position Error ( ): The normalized angular difference between the actual shaft position and the position indicated by the encoder cycle count. Cycle Error (C): An indication of cycle uniformity. The difference between an observed shaft angle which gives rise to one electrical cycle, and the nominal angular increment of 1/N of a
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Absolute Maximum Ratings
Parameter Storage Temperature, TS Operating Temperature, TA Supply Voltage, VCC Output Voltage, VO Output Current per Channel, IOUT Vibration Shaft Axial Play Shaft Eccentricity Plus Radial Play Velocity Acceleration HEDS-55XX/56XX -40C to 100C -40C to 100C -0.5 V to 7 V -0.5 V to VCC -1.0 mA to 5 mA 20 g, 5 to 1000 Hz 0.25 mm ( 0.010 in.) 0.1 mm (0.004 in.) TIR 30,000 RPM 250,000 rad/sec2 HEDM-550X/560X -40C to +70C -40C to +70C -0.5 V to 7 V -0.5 V to VCC -1.0 mA to 5 mA 20 g, 5 to 1000 Hz 0.175 mm ( 0.007 in.) 0.04 mm (0.0015 in.) TIR 30,000 RPM 250,000 rad/sec2
Direction of Rotation: When the codewheel rotates in the counterclockwise 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. Index Pulse Width (PO ): The number of electrical degrees that an index output is high during one full shaft rotation. This value is nominally 90e or 1/4 cycle.
Output Waveforms
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Recommended Operating Conditions
Parameter Temperature HEDS Series Temperature HEDM Series Supply Voltage Load Capacitance Count Frequency Shaft Perpendicularity Plus Axial Play (HEDS Series) Shaft Eccentricity Plus Radial Play (HEDS Series) Shaft Perpendicularity Plus Axial Play (HEDM Series) Shaft Eccentricity Plus Radial Play(HEDM Series) Symbol Min. TA TA VCC CL f -40 -40 4.5 5.0 Typ. Max. 100 70 5.5 100 100 0.25 ( 0.010) Units C C Volts pF kHz mm (in.) non-condensing atmosphere Ripple < 100 mVp-p 2.7 k pull-up Velocity (rpm) x N/60 6.9 mm (0.27 in.) from mounting surface 6.9 mm (0.27 in.) from mounting surface 6.9 mm (0.27 in.) from mounting surface 6.9 mm (0.27 in.) from mounting surface Notes
0.04 mm (in.) (0.0015) TIR 0.175 ( 0.007) mm (in.)
0.04 mm (in.) (0.0015) TIR
Note: The module performance is guaranteed to 100 kHz but can operate at higher frequencies. 2.7 k pull-up resistors required for HEDS-5540 and 5640.
Encoding Characteristics
Encoding Characteristics over Recommended Operating Range and Recommended Mounting Tolerances unless otherwise specified. Values are for the worst error over the full rotation. Part No. HEDS-5500 HEDS-5600 (Two Channel) Description Pulse Width Error Logic State Width Error Phase Error Position Error Cycle Error Pulse Width Error Logic State Width Error Phase Error Position Error Cycle Error Pulse Width Error Logic State Width Error Phase Error Position Error Cycle Error Index Pulse Width CH. I rise after CH. A or CH. B fall -40C to +100C Sym. P S C P S C P S C PO t2 t2 Min. Typ.* 7 5 2 10 3 10 10 2 10 3 5 5 2 10 3 90 100 150 Max. 45 45 20 40 5.5 45 45 15 40 7.5 35 35 15 40 5.5 125 250 1000 Units e e e min. of arc e e e e min. of arc e e e e min. of arc e e ns ns
HEDM-5500 HEDM-5600 (Two Channel)
HEDS-5540 HEDS-5640 (Three Channel)
55 -300 70
CH. I fall after -40C to +100C CH. B or CH. A rise
Note: See Mechanical Characteristics for mounting tolerances. *Typical values specified at VCC = 5.0 V and 25C.
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Electrical Characteristics
Electrical Characteristics over Recommended Operating Range. Part No. HEDS-5500 HEDS-5600 Parameter Supply Current High Level Output Voltage Low Level Output Voltage Rise Time Fall Time Supply Current High Level Output Voltage Low Level Output Voltage Rise Time Fall Time Supply Current High Level Output Voltage Low Level Output Voltage Rise Time Fall Time Sym. ICC VOH VOL tr tf ICC VOH VOL tr tf ICC VOH VOL tr tf Min. 2.4 0.4 200 50 30 2.4 57 85 0.4 180 40 30 2.4 57 85 0.4 180 40 Typ.* 17 Max. 40 Units mA V V ns ns mA V V ns ns mA V V ns ns Notes IOH = -40 A max. IOL = 3.2 mA CL = 25 pF RL = 11 k pull-up IOH = -200 A max. IOL = 3.86 mA CL = 25 pF RL = 2.7 k pull-up IOH = -40 A max. IOL = 3.86 mA CL = 25 pF RL = 3.2 k pull-up
HEDS-5540 HEDS-5640 HEDM-5500 HEDM-5600 HEDM-5500 HEDM-5600
*Typical values specified at VCC = 5.0 V and 25C.
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Mechanical Characteristics
Parameter Codewheel Fits These Standard Shaft Diameters Symbol Dimension 23 56 5/32 3/16 Moment of Inertia Required Shaft Length[2] Bolt Circle[3] 2 screw mounting 3 screw mounting external mounting ears Mounting Screw Size[4] 2 screw mounting 3 screw mounting external mounting ears Encoder Base Plate Thickness Hub Set Screw J 4 8 1/8 1/4 Tolerance[1] +0.000 -0.015 +0.0000 -0.0007 0.5 ( 0.02) 0.13 ( 0.005) 0.13 ( 0.005) 0.13 ( 0.005) Units mm in g-cm2 (oz-in-s2) mm (in.) mm (in.) mm (in.) mm (in.) mm (in.) mm (in.) mm (in.) mm (in.) (in.)
0.6 (8.0 x 10-6 ) 14.0 (0.55) 19.05 (0.750) 20.90 (0.823) 46.0 (1.811) M 2.5 or (2-56) M 1.6 or (0-80) M 2.5 or (2-56) 0.33 (0.130) (2-56)
Notes: 1. These are tolerances required of the user. 2. The HEDS-55X5 and 56X5, HEDM-5505, 5605 provide an 8.9 mm (0.35 inch) diameter hole through the housing for longer motor shafts. See Ordering Information. 3. The HEDS-5540 and 5640 must be aligned using the aligning pins as specified in Figure 3, or using the alignment tool as shown in "Encoder Mounting and Assembly". See also "Mounting Considerations." 4. The recommended mounting screw torque for 2 screw and external ear mounting is 1.0 kg-cm (0.88 in-lbs). The recommended mounting screw torque for 3 screw mounting is 0.50 kg-cm (0.43 in-lbs).
Electrical Interface
To insure reliable encoding performance, the HEDS-5540 and 5640 three channel encoders require 2.7 k ( 10%) pull-up resistors on output pins 2, 3, and 5 (Channels I, A, and B) as shown in Figure 1. These pull-up resistors should be located as
close to the encoder as possible (within 4 feet). Each of the three encoder outputs can drive a single TTL load in this configuration. The HEDS-5500, 5600, and HEDM-5500, 5600 two channel encoders do not normally require pull-up resistors. However, 3.2 k
pull-up resistors on output pins 3 and 5 (Channels A and B) are recommended to improve rise times, especially when operating above 100 kHz frequencies.
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Figure 1. Pull-up Resistors on HEDS-5X40 Encoder Outputs.
Mounting Considerations
The HEDS-5540 and 5640 three channel encoders and the HEDM Series high resolution encoders must be aligned using the aligning pins as specified in Figure 3, or using the HEDS-8910 Alignment Tool as shown in Encoder Mounting and Assembly. The use of aligning pins or alignment tool is recommended but not required to mount the HEDS-5500 and 5600. If these
two channel encoders are attached to a motor with the screw sizes and mounting tolerances specified in the mechanical characteristics section without any additional mounting bosses, the encoder output errors will be within the maximums specified in the encoding characteristics section. The HEDS-5500 and 5540 can be mounted to a motor using either the two screw or three screw
mounting option as shown in Figure 2. The optional aligning pins shown in Figure 3 can be used with either mounting option. The HEDS-5600, 5640, and HEDM-5600 have external mounting ears which may be used for mounting to larger motor base plates. Figure 4 shows the necessary mounting holes with optional aligning pins and motor boss.
11.10 / 10.94 (0.438 / 0.431)
2.39 / 2.34 (0.096 / 0.092)
Figure 2. Mounting Holes.
Figure 3. Optional Mounting Aids.
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2.39 / 2.34 (0.096 / 0.092)
0.25 (0.010) X 45 CHAMFER 2 PLACES A O 0.15 (0.006)
0.8 (0.03) X 45 CHAMFER O A 0.05 (0.002)
11.10 / 10.94 (0.438 / 0.431)
Figure 4. Mounting with External Ears.
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Encoder Mounting and Assembly
1. For HEDS-5500 and 5600: Mount encoder base plate onto motor. Tighten screws. Go on to step 2. 1a. For HEDS-5540, 5640 and HEDM-5500, 5600: Slip alignment tool onto motor shaft. With alignment tool in place, mount encoder baseplate onto motor as shown above. Tighten screws. Remove alignment tool.
2. Snap encoder body onto base plate locking all 4 snaps.
3a. Push the hex wrench into the body of the encoder to ensure that it is properly seated into the code wheel hub set screws. Then apply a downward force on the end of the hex wrench. This sets the code wheel gap by levering the code wheel hub to its upper position. 3b. While continuing to apply a downward force, rotate the hex wrench in the clockwise direction until the hub set screw is tight against the motor shaft. The hub set screw attaches the code wheel to the motor's shaft. 3c. Remove the hex wrench by pulling it straight out of the encoder body.
4. Use the center screwdriver slot, or either of the two side slots, to rotate the encoder cap dot clockwise from the one dot position to the two dot position. Do not rotate the encoder cap counterclockwise beyond the one dot position. The encoder is ready for use!
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Connectors
Manufacturer AMP Dupont/Berg Agilent (designed to mechanically lock into the HEDS-5XXX, HEDM-5X0X Series) Molex 103686-4 640442-5 65039-032 with 4825X-000 term. HEDS-8902 (2 ch.) with 4-wire leads HEDS-8903 (3 ch.) with 5-wire leads 2695 series with 2759 series term. Part Number
*
N/A*
*
Figure 5. HEDS-8902 and 8903 Connectors.
Typical Interfaces
HEDS-55XX CH. A OR HEDS-56XX CH. B OR HEDM-5X0X HCTL-2016/ 2020 QUADRATURE DECODER/ COUNTER
HOST PROCESSOR
HEDS-55XX OR HEDS-56XX OR HEDM-5X0X
CH. A CH. B
HCTL-1100 MOTION CONTROL IC
HOST PROCESSOR
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Ordering Information
Encoders with Film Codewheels HEDM-5 0 Option
Mounting Type 5 - Standard 6 - External Mounting Ears
Outputs 0 - 2 Channel
Through Hole 0 - None 5 - 8.9 mm (0.35 in.)
Resolution (Cycles/Rev) B - 1000 CPR J - 1024 CPR
Shaft Diameter 01 - 2 mm 06 - 1/4 in. 02 - 3 mm 11 - 4 mm 03 - 1/8 in. 14 - 5 mm 04 - 5/32 in. 12 - 6 mm 05 - 3/16 in. 13 - 8 mm
HEDS-8910 0
Alignment Tool
(Included with each order of HEDM-550X/560X two channel encoders)
Encoders with Metal Codewheels HEDS-5
Mounting Type 5 - Standard 6 - External Mounting Ears Outputs 0 - 2 Channel 4 - 3 Channel Through Hole 0 - None 5 - 8.9 mm (0.35 in.)
Option
Resolution (Cycles/Rev) (HEDS-550X, 560X 2 Channel) S - 50 CPR F - 256 CPR K - 96 CPR G - 360 CPR C - 100 CPR H - 400 CPR D - 192 CPR A - 500 CPR E - 200 CPR I - 512 CPR (HEDS-554X, 564X 3 Channel) G - 360 CPR S - 50 CPR H - 400 CPR K - 96 CPR A - 500 CPR C - 100 CPR I - 512 CPR E - 200 CPR F - 256 CPR Shaft Diameter 01 - 2 mm 06 - 1/4 in. 02 - 3 mm 11 - 4 mm 03 - 1/8 in. 14 - 5 mm 04 - 5/32 in. 12 - 6 mm 05 - 3/16 in. 13 - 8 mm
HEDS-8910 0
Alignment Tool
(Included with each order of HEDS-554X/564X three channel encoders)
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01 HEDM-5500 HEDM-5505 HEDM-5600 HEDM-5605 HEDS-5500 B J B J B J B J A C E F G H I K S A C E F G H I K A C E F G H I A C H I A C E G H I * * * * * * *
02 * *
03 04 05 06 * * * * * * * * *
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HEDS-5505
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HEDS-5540
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HEDS-5545
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HEDS-5600
* *
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01 HEDS-5605 A C E F G H I A E F H A C E G H I
02
03 40 05 06 * * * * * * * * * * *
11 12 13 14 *
* * * *
HEDS-5640
HEDS-5645
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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) 271 2451 India, Australia, New Zealand: (+65) 271 2394 Japan: (+81 3) 3335-8152(Domestic/International), or 0120-61-1280(Domestic Only) Korea: (+65) 271 2194 Malaysia, Singapore: (+65) 271 2054 Taiwan: (+65) 271 2654 Data subject to change. Copyright (c) 2002 Agilent Technologies, Inc. Obsoletes 5988-2579EN January 17, 2002 5988-3996EN

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