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Agilent AEDS-962x for 300 LPI Ultra Small Optical Encoder Modules
Data Sheet
Features * Very small * Low package height * Built-in codewheel and codestrip guide bumps * Wide resolution range * For linear and rotary applications * No signal adjustment required * Insensitive to radial and axial play * 0C to +70C operating temperature Description This is a very small, low package height and high performance incremental encoder module. When operated in conjunction with either a codewheel or codestrip, this module detects rotary or linear position. The encoder 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 3.3 V supply input are accessed through four solder plated leads located on 2.00 mm (0.1 inch) centers. The supply input of the LED, rated at 16 mA, is accessed through two leads located at 2.54 mm. It is designed for use with an 23.36 mm optical radius codewheel or linear codestrip. Other options are available. Please contact the factory for more information. Applications The AEDS-962x provides sophisticated motion detection, making closed-loop control very cost effective. 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 and critical-care medical equipment. Please contact a sales representative if more clarification is needed. Theory of Operation The AEDS-962x 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 Figure 1, the module contains a single Light Emitting Diode (LED) as its light source. * Two-channel quadrature output * TTL 3.3 V CMOS compatible * Wave solderable
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 codewheel/codestrip moves between the emitter and detector, causing the light beam to be interrupted by the pattern of spaces and bars on the codewheel/codestrip. The photodiodes which detect these interruptions are arranged in a pattern that corresponds to the radius and count density of the codewheel/codestrip. These detectors are also spaced such that a light period on one pair of
ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.
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 output of channel A is in quadrature with channel B (90 degrees out of phase). Definitions Note: Refer to Figure 2. 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 each state width from its ideal value of 90e.
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 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.
Phase Error (): The deviation of the phase from its ideal value of 90e. 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. Optical Radius (ROP): The distance from the codewheel's center of rotation to the optical center (O.C.) 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): The distance from motor shaft center of rotation to center of alignment tab receiving hole.
Absolute Maximum Ratings Parameter Storage Temperature Operating Temperature Supply Voltage (Detector) Output Voltage Output Current per Channel Soldering Temperature DC Forward Current (LED) Reverse Voltage Symbol TS TA VCC VO IO ILED VR Min. -40 0 -0.5 -0.5 -1.5 Max. 85 70 7 VCC 10 260 50 5 Units C C V V mA C mA V Notes
t 5 sec. VF < 1.8 V IR = 100 A
2
Recommended Operating Conditions Parameter Temperature Supply Voltage (Detector) Load Capacitance Pullup Resistor Count Frequency Angular Misalignment Error Mounting Position DC Forward Current (LED) @ VCC = 3.3 V Symbol TA VCC CL RPULL f EA RM ILED Min. 0 2.8 Typ. 25 3.3 none none Max. 70 5.2 100 Units C V pF k kHz deg. mm (inch) Notes Ripple < 100 mV p-p Recommend no pullup. Device has integrated 2.2 K on outputs. Velocity (rpm) x N/60 Mounting Considerations *Refer to Mounting Considerations Recommended 110 (10%) series resistor between 3.3 V supply and VLED .
-3.0
10
0.0 ROP - 2.4 (ROP - 0.095") 16 20
40 +3.0
Electrical Characteristics Electrical Characteristics over Recommended Operating Range, Typical at 25C. Parameter Supply Current (Detector) High Level Output Voltage Low Level Output Voltage Rise Time Fall Time LED Forward Voltage Symbol ICC VOH VOL tr tf VF 200 50 1.52 1.54 Min. 2 2.4 Typ. @ 3.3 V 3 3 Max. 5 3.6 0.4 Units mA V V ns ns V Notes
When VOH = 2.4 (min.) Typical IOH = -0.4 mA @ 3.3 V When VOL = 0.4 (min.) Typical IOH = 13 mA @ 3.3 V CL = 25 pF, RL = 11 k
Note: Refer to Figure 2 for output waveform on tr and tf.
Encoding Characteristics Encoding Characteristics Over the Recommended Operating Conditions and Mounting Conditions. 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 4 5 4 Maximum 40 40 15 Units e e e
Note: Recommended no pullup. Device has integrated 2.2 k pullup resistor on Channel A & Channel B outputs.
3
AEDS-962x SERIES BLOCK DIAGRAM
PULLUP RESISTOR
PHOTODIODES
2
2.5 K x 2
COMPARATORS
VCC
VLED
5
LENS
A
+
1
CHANNEL A
LED
SIGNAL PROCESSING B CIRCUITRY +
A-
3
CHANNEL B
GND
6
B-
4
GND
EMITTER SECTION
CODE WHEEL
DETECTOR SECTION
Figure 1.
AMPLITUDE C P CHANNEL A
I
O
S1 S2
S3
S4
2.4V
CHANNEL B 0.4V
tr
tf
ROTATION
Figure 2.
4
PH 3
PH 2
PH 1
PROCESS
COOLING
E 200
DEGREES C
150
B 100 D
50
C
Figure 3. Recommended wave solder profile.
A B C D E
Parameter Solder Pot Temperature Preheat Zone Temperature Dip in Time Solder Pot Zone (PCB Top) Solder Pot Zone (Encoder Lead)
Min. NA 85 2.5 NA 200
Max. 260 110 5.0 160 NA
Nominal Values 240 - 250 90 - 105 2.5 - 4.5 <160 200
Units C C sec C C
Notes: I. Nominal values are evaluated profiles for optimum performance. 2. Min./Max. are critical limits to ensure encoders in good condition.
5
IMAGE SIDE OF CODEWHEEL / CODESTRIP 4.75 (0.187) MAX. EG
4.40 0.15 (0.173 0.006) SEE NOTE RM ROP
C OF ALIGNMENT TAB L
4.30 (0.169) MAX 4.50 (0.177) MIN.
ER ET 2.05 MIN. EA
2XR
O 2.05 HOLE MIN. 1.0 DEEP MIN. RM ROP - 2.40 (0.094)
NOTE: THESE DIMENSIONS INCLUDE SHAFT END PLAY AND CODEWHEEL WARP. ALL DIMENSIONS FOR MOUNTING IN THE MODULE AND CODEWHEEL/CODESTRIP SHOULD BE MEASURED WITH RESPECT TO THE TWO MOUNTING POSTS SHOWN ABOVE.
Figure 4. Mounting consideration.
Error Gap Radial Tangential Angular
Symbol EG ER ET EA
Rop = 11.00 mm 0.15 0.26 0.28 3
Unit mm mm mm C
Notes Recommend CW be put closer to the detector side (upper side), in order to keep enough margin for encoder operation.
6
Package Dimensions AEDS-9621
Y Y W W X X X X X
RESOLUTION IDENTIFICATION PART # (REFER -05) C - COUNTRY OF ORIGIN MARKING (REFER -05 FOR DETAILS)
R 1.1
CH A VCC GND CH B VCC GND
2.00 TYP.
6 - 1.00 2.54 TYP. 1.27 2 - 2.10 0.05 DATE CODE OPTICAL CENTER MARK 4.40 11.0 0.2 13.1 0.2 MOUNTING FOOTPRINT 11.0
(OPTICAL CENTER)
10
A gi le nt
3.5
0.5 Agilent X 10
XXXXX 13.7 6.9 3.5 C YYWW
1.00
1.4 5.6
0.254 (LEADFRAME THICKNESS)
(DETECTOR)
4.1 0.5
CHAMFERED LEAD-IN (BOTH SIDES)
1.0 7.0 0.5 2.0 MAX. EXTERNAL RADIUS R 0.5
0.8
1.8 2.00 (2 PLACES)
2.6 7.6
(EMITTER)
1.10 4.40
7
Package Dimensions AEDS-9620
Y Y W W 10 A gi le n t
X X X X X
RESOLUTION IDENTIFICATION PART # (REFER -05) C - COUNTRY OF ORIGIN MARKING (REFER -05 FOR DETAILS)
R 1.1
3.5
0.5 Agilent X 10
CH A V CC G CH ND B G N V CC D
LEAD PITCH 2.00
XXXXX 13.7 6.9 C 3.5 YYWW
LEAD PITCH 2.56
2.00 TYP.
6 - 1.00 2.54 TYP. 1.27 DATE CODE OPTICAL CENTER MARK 1.4 5.6
1.00
MOUNTING FOOTPRINT 11.0
(OPTICAL CENTER)
0.254 (LEADFRAME THICKNESS)
(DETECTOR)
4.1 0.5
CHAMFERED LEAD-IN (BOTH SIDES)
1.0 7.0 0.5 2.0 MAX. EXTERNAL RADIUS R 0.5
0.8
1.8 2.00 (2 PLACES)
2.6 7.6
(EMITTER)
1.10 4.40
8
Ordering Information Bracket Options 10
AEDS-96
Option
2 - Linear
Lead Configuration 0 - Straight Leads 1 - Bent Leads
Resolution Options 2 - 300 LPI, Linear
9
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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. November 26, 2002 5988-8275EN
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