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High Temperature 125C Two Channel Optical Incremental Encoder Modules Technical Data
HEDT-9000 HEDT-9100
Features
* High Performance * High Resolution * Low Cost * Easy to Mount * No Signal Adjustment Required * Insensitive to Radial and Axial Play * Small Size * -40C to 125C Operating Temperature * Two Channel Quadrature Output * TTL Compatible * Single 5 V Supply
Description
The HEDT-9000 and the HEDT9100 series are high performance, low cost, optical incremental encoder modules that operate to 125C. When used with a codewheel, these modules detect rotary position. The modules consist 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 unique photodetector array, these modules are extremely tolerant to mounting misalignment.
The two channel digital outputs and the single 5 V supply input are accessed through five 0.025 inch square pins located on 0.1 inch centers.
Package Dimensions
CH. B VCC CH. A N.C. GND 5 4 3 2 1
2.54 (0.100) TYP. 1.52 (0.060) 1.0 (0.04) DATE CODE 3.73 0.05 (0.147 0.002) 20.8 (0.82) 11.7 (0.46) 2.67 (0.105) DIA. MOUNTING THRU HOLE 2 PLACES 2.44/2.41 X 2.79 (0.096/0.095 X 0.110) 2.16 (0.085) DEEP OPTICAL CENTER OPTICAL CENTER LINE 5.46 0.10 (0.215 0.004) 2.21 (0.087) 2.54 (0.100) 1.8 (0.07) 2.9 (0.11) 6.9 (0.27)
OPTION CODE 5.1 (0.20)
GND
VCC
0.63 (0.025) SQR. TYP.
26.67 (1.05) 15.2 (0.60)
8.6 (0.34)
11.9 (0.47)
1.02 0.10 (0.040 0.004)
ALIGNING RECESS 2.44/2.41 DIA. 1.85 (0.073) (0.096/0.095) 2.16 (0.085) 8.64 (0.340) DEEP REF.
ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.
HEDS-9X00
YYXX X00
4.75 0.10 (0.187 0.004) ALIGNING RECESS 2.44/2.41 X 2.79 (0.096/0.095 X 0.110) 2.16 (0.085) DEEP OPTICAL CENTER
8.81 5.8 45 (0.23) (0.347) ALIGNING RECESS 2.44/2.41 DIA. (0.096/0.095) 2.16 (0.085) DEEP 4.11 (0.162) 6.35 (0.250) REF.
C L 17.27 (0.680) 20.96 (0.825)
1.78 0.10 (0.070 0.004) 2.92 0.10 (0.115 0.004) 10.2 (0.400)
SIDE A
TYPICAL DIMENSIONS IN MILLIMETERS AND (INCHES)
SIDE B
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Standard resolutions for the HEDT-9000 are 500 CPR and 1000 CPR for use with a HEDS6100 codewheel or equivalent. For the HEDT-9100, standard resolutions between 96 CPR and 512 CPR are available for use with a HEDS-5120 codewheel or equivalent.
Block Diagram
Applications
The HEDT-9000 and 9100 provide sophisticated motion detection at a low cost, at temperatures to 125C, making them ideal for high volume automotive applications. 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.
Output Waveforms
Theory of Operation
The HEDT-9000 and 9100 are Cshaped emitter/detector modules. Coupled with a codewheel, they translate the rotary motion of a shaft into a two-channel digital output. As seen in the block diagram, each 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 polyetherimide 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 product 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. 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 that of channel B (90 degrees out of phase).
Definitions
Count (N): The number of bar and window pairs or counts per revolution (CPR) of the codewheel.
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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.
Absolute Maximum Ratings
Storage Temperature, T S ..................................................................... -40C to 125C Operating Temperature, TA ................................................................ -40C to 125C Supply Voltage, VCC ...................................................................................... -0.5 V to 7 V Output Voltage, VO ........................................................................................ -0.5 V to VCC Output Current per Channel, Iout ................................................. -1.0 mA to 5 mA 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 in the direction of the arrow on top of the module, 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 (O.C.) of the encoder module.
Recommended Operating Conditions
Parameter Temperature Supply Voltage Load Capacitance Count Frequency Symbol T VCC CL f Min. -40 4.5 Typ. Max. 125 5.5 100 100 Units C Volts pF kHz Ripple < 100 mVp-p 3.3 k pull-up resistor Velocity (rpm) x N 60
Note: The module performance is guaranteed to 100 kHz but can operate at higher frequencies.
Notes
Encoding Characteristics
Encoding Characteristics over Recommended Operating Range and Recommended Mounting Tolerances. These Characteristics do not include codewheel/codestrip contributions. Description Pulse Width Error Logic State Width Error Phase Error Sym. P S Typ. 7 5 2 Case 1 Max. 35 35 15 Case 2 Max. 45 45 20 Units e e e Notes
Case 1: Module mounted on tolerance circle of 0.13 mm ( 0.005 in.). Case 2: HEDT-9000 mounted on tolerances of 0.50 mm (0.020"). HEDT-9100 mounted ontolerances of 0.38 mm (0.015").
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Electrical Characteristics
Electrical Characteristics over Recommended Operating Range, typical at 25C. Parameter Supply Current High Level Output Voltage Low Level Output Voltage Rise Time Fall Time Symbol ICC VOH VOL tr tf 200 50 2.4 0.4 Min. Typical 17 Max. 40 Units mA Volts Volts ns ns IOH = -40 A max. IOL = 3.2 mA CL = 25 pF RL = 11 k pull-up Notes
Recommended Codewheel Characteristics Codewheel Options
HEDS Series 5120 5120 5120 5120 5120 5120 5120 5120 5120 6100 6100 CPR (N) 96 100 192 200 256 360 400 500 512 500 1000 Optical Radius mm (in.) 11.00 (0.433) 11.00 (0.433) 11.00 (0.433) 11.00 (0.433) 11.00 (0.433) 11.00 (0.433) 11.00 (0.433) 11.00 (0.433) 11.00 (0.433) 23.36 (0.920) 23.36 (0.920)
Option K C D E F G H A I A B
Figure 1. Codestrip Design.
Parameter Window/Bar Ratio Window Length Absolute Maximum Codewheel Radius
Symbol w/b L RC
Minimum 0.7 1.8 (0.07)
Maximum 1.4 2.3 (0.09) ROP + 1.9 (0.075)
Units mm (inch)
Notes
mm (inch) Includes eccentricity errors
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Mounting Considerations
Figure 2. Mounting Plane Side A.
Figure 3. Mounting Plane Side B.
Figure 4. HEDS-5120 Codewheel.
Figure 5. HEDS-6100 Codewheel.
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Ordering Information
HEDT-9001 Option 00 HEDS-6100 Option
Resolution (Cycles/Rev) A - 500
Shaft Diameter 06 - 1/4 in. 08 - 3/8 in. 09 - 1/2 in. 10 - 5/8 in.
HEDT-910
Option
0
0
HEDS-5120 Option
Lead 0 - Straight Leads 1 - Bent Leads
Resolution (Cycles/Rev) C - 100 CPR D - 192 CPR E - 200 CPR G - 360 CPR A - 500 CPR I - 512 CPR
Shaft Diameter 01 - 2 mm 02 - 3 mm 03 - 1/8 in. 04 - 5/32 in. 05 - 3/16 in. 06 - 1/4 in. 11 - 4 mm 14 - 5 mm 12 - 6 mm 13 - 8 mm
A HEDT-9001 HEDT-9100 HEDT-9101 * * *
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01 HEDS-6100 A
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01 HEDS-5120 A C D E F G H I K *
02 * *
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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 5988-2577EN February 11, 2002 5988-5280EN

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