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Agilent AEAS-72AA-xxxAA Absolute Encoder
Data Sheet
Features * Gray code * High or low power source options * IP 50 rating * 38 mm package diameter * 8 bits resolution * 6 mm shaft diameter * The package comes with 0.5 m long cable Description The AEAS-72AA-xxxAA absolute encoder is a feedback device that has the capability to generate a unique binary `word' for each encoder shaft position. The AEAS72AA-xxxAA also has the unique feature of being able to provide positional information upon power up without the need for codewheel movement, unlike incremental encoders, which need codewheel movement to provide positional information. Each absolute encoder from the AEAS-72AA-xxxAA consists of a lensed LED (Light Emitting Diode) source, an integrated circuit with detectors and output circuitry, and a special multi-track glass codewheel that rotates between the emitter and detector IC. These 3 main components are contained within a strong metal housing fitted with bearings to produce an IP rated encoder capable of working in dusty conditions. Applications * Tool changers and axis control for machine tools * Robotics * Telescopes and antennas * Rotary and X - Y positioning tables * Medical scanners
Package Dimensions
5.5 0.2
3-M3 DEPTH 5 P.C.D28
5 0.1 12 0.3 10 0.2
38
MODEL NAME PLATE
38 0.2
20h7
12
A
0
1 A
ZERO ADDRESS POSITION TOLERANCE 5 7 10
6h7
ABSOLUTE ENCODER PART No: AEAS-72AA-XXXAA SERIAL No: XX-XXX MADE IN JAPAN
12 0 1
CONNECTIONS BLU RED +*~*V BLK OV.COM VLT GRA BRN 20 WHT ORN 21 SHIELD YEL 22 GRN 23
TOLERANCE IS 0.5 mm UNLESS OTHERWISE SPECIFIED. TYPICAL DIMENSIONS IN MILLIMETERS. 24 25 26 27 FG JIS (JAPANESE INDUSTRIAL STANDARD) 20h7 6h7 NOTE: INFORMATION FROM JIS B0401(1999) DEFINITION (mm) 20 +0 -0.021 +0 6 -0.015
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Theory of Operation The AEAS-72AA-xxxAA is a singleturn, low-cost, and compact absolute encoder which uses optical technology to provide absolute positioning information. The AEAS-72AA-xxxAA consists of a LED, Fixed Slit, Codewheel (Rotating Disc) and Photodiode IC. By using these four main components, the AEAS-72AA-xxxAA is able to produce signals in either binary or gray output form. These signals provide to the designer a unique code for each position that the codewheel is in. As seen in the diagram, the encoder contains a single Light Emitting Diode (LED) as its light source.
The light is collimated into a parallel beam by means of a lens which is built into the LED housing. This parallel beam goes through the Fixed Slit that creates a certain light pattern, due to its pattern of slots, which will fall onto the code-wheel. The movement of the code-wheel between LED and Photo detector, causes the light pattern (from the Fixed Slit) to be further interrupted by the pattern of spaces and bars on the codewheel. This final light pattern from the codewheel is then detected by the Photodiode IC where its signals are fed through signal processing circuitry to produce 8 or 10 parallel signals in binary or gray output form.
LED
FIXED SLIT
PHOTODIODE IC
CODEWHEEL SHAFT
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Absolute Maximum Ratings Storage Temperature Operating Temperature Supply Voltage -25C to 80C -10C to 55C DC4.5 V to 13.2 V (for output mode = V) DC4.5 V to 13.2 V; DC10.8 V to 26.4 V (for output mode = C) (note: VCC ripple at 3% p-p max.) RH85% (IP50): Protected against dust-limited ingress (no-harmful deposit) and no protection against liquids. 490 m/s2 with 11ms at X, Y, Z directions
Humidity Degree of Protection Shock
Electrical Characteristics (over recommended operating conditions. Typically at 25C) Parameter Current Consumption (without load) High Level Output Voltage Low Level Output Voltage Rise Time Fall Time Response Frequency Angular Accuracy Symbol ICC VOH VOL tr tf f Maximum 160m (max.) for option V 100m (max.) for option C VCC - 1 V (for output mode = V) 0.5 or less 1 1 5K (max.) 0.700 (max.) Units A V V s s Hz deg
Mechanical Ratings Parameter Starting Torque Angular Acceleration Shaft Loading Moment of Inertia Speed Net-Weight (without cable) Vibration (in X, Y, Z directions for 2 hrs.) Axial Thrust Radial Maximum 9.8 x 10-4 (max. at 25C) 1 x 105 19.6 29.4 8 x 10-7 6000 120 10 to 55 Units Nm rad/s2 N N Kg.cm2 RPM g Hz/1.5 mm (p-p)
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Electrical Interface
VOLTAGE OUTPUT
OUTPUT MODE
V 2 K SIGNAL SIGNAL VCC C
OPEN COLLECTOR OUTPUT
OUTPUT MODE
VCC
0V
0V
Output Waveforms Definition Signals are extracted by rotating the shaft in clockwise direction as viewed from arrow angle. The example signals shown are gray code output.
20
H
L
H 21 L
H 22 L
H 23 L
H 24 L
H 25 L
H 26 L
H 27 L 0 1 2 3 4 5 6 7
5
Electrical Connections Color of Lead Wire Red Black Brown Orange Yellow Green Blue Purple Gray White Shielding Braid Description Power Source 0 V Common Signal 20 Signal 21 Signal 22 Signal 23 Signal 24 Signal 25 Signal 26 Signal 27 F.G.
Ordering Information AEAS-72AAAA
Power Source L = 5 to 12 V H = 12 to 24 V
Output Code G = Gray Code Negative Logic
Output Mode C = Open Collector V = Voltage Out, only available for option L of power source (5 to 12 V)
Part Numbers Currently Available: AEAS-72AA-HGCAA AEAS-72AA-LGCAA AEAS-72AA-LGVAA
Note: Please contact your local Agilent sales representative for other options.
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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) 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) 2003 Agilent Technologies, Inc. Obsoletes 5988-8180EN February 10, 2003 5988-8669EN
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