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Part: 06F5823
Category:
Description: Rotary Encoder
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Datasheet: Download 06F5823 datasheet File size : 36 kB
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Quick Assembly Two and Three Channel Optical Encoders Technical Data
HEDM-550X/560X HEDS-550X/554X HEDS-560X/564X
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 · -40°C to 100°C Operating Temperature · TTL Compatible · Single 5 V Supply
with detectors and output circuitry, and a codewheel which rotates between the emitter and detector IC. The outputs of the 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 Hewlett-Packard sales representatives for other resolutions.
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
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.
ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.
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5965-5875E
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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MOTION SENSING AND CONTROL
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 180°e or 1/2 cycle. Pulse Width Error ( P): 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 ( S): The deviation, in electrical degrees, of each state width from its ideal value of 90°e. 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 90°e for quadrature output. Phase Error (): The deviation of the phase from its ideal value of 90°e.
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 - 40°C to 100°C - 40°C to 100°C - 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 - 40°C to +70°C - 40°C to +70°C - 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
MOTION SENSING AND CONTROL
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 90°e 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 -25°C to +100°C CH. A or CH. B fall -40°C to +100°C CH. I fall after -25°C to +100°C CH. B or CH. A rise - 40°C to +100°C
Note: See Mechanical Characteristics for mounting tolerances. *Typical values specified at VCC = 5.0 V and 25°C.
Sym. P S C P S C P S C PO t1 t1 t2 t2
Min.
Typ.* 7 5 2 10 3 10 10 2 10 3 5 5 2 10 3 90 100 100 150 150
Max. 45 45 20 40 5.5 45 45 15 40 7.5 35 35 15 40 5.5 125 250 250 300 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 ns ns
HEDM-5500 HEDM-5600 (Two Channel)
HEDS-5540 HEDS-5640 (Three Channel)
55 10 -300 70 70
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06-1
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