AVAGO AEDS

AEDS-965X
Small Optical Encoder Modules 150 and 180 LPI Digital Output
Data Sheet
Description
Features
The AEDS-965X is a very small, low package height
and high performance incremental encoder module.
It can operate at supply voltage, Vcc, 3.3/5V and the
output voltage, Voh, will follow the Vcc voltage level.
• Small Size
When operated in conjunction with a codestrip, this
module detects linear position. The encoder consists
of lensed LED source and a detector IC enclosed in a
small C-shaped plastic package. Due to the brighter
LED, coupled with a photodetector array, which is less
sensitive to light, the encoder is highly tolerant to
aerosol environment. This module is extremely
receptive to mounting misalignment.
• Insensitive to Radial, Tangential and Axial Play
The two channel digital outputs and Vcc, supply
voltage input, are accessed through four solder plated
leads located on 2.00mm (0.1 inch) centers. The supply
input of LED, rated at 16mA is accessed through two
leads located at 2.54mm.
• Wave solderable
It is designed for use with a linear codestrip. Other
options are available. Please contact the factory for
more information.
• Built-in guide bumps for codewheel and codestrip
• Low Package Height
• 0°C to +70°C recommended operating temperature
• Wide Resolution Range
• Two Channel Quadrature Output
• TTL 3.3V or 5.0V CMOS compatible
• For Linear and Rotary Application
• RoHS Compliant
• Aerosol Tolerant
Applications
• Printers
• Copiers/Fax
• Plotters
• Office Automation Equipments
Theory of Operation
Definitions
The AEDS-965X 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 a two-channel
digital output.
Note: Refer to Figure 1 for the output waveform
As seen in the Figure 1, the module contains a single
Light Emitting Diode (LED) as its light source. The light
is collimated into parallel beam by means of a single
lens located directly over the LED. Opposite the emitter
are the integrated detector circuits.
This IC consists of multiple sets of photodetectors and
a 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 codehweel/
codestrip. The photodiodes that detect these
interruptions are arranged in a pattern that
corresponds to the radius and count density of the
codewheel/0codestrip.
These detectors are also spaced such that a light period
on one pair of detectors corresponds to a dark period
on the adjacent pairs 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).
Aerosol Tolerant
The AEDS-965x series uses the Transmissive Optical
Technology with specially designed photodetector IC
to reduce and compensate the errors due to ink mists
contaminations. Coupled with a brighter LED, for better
penetration through ink mists deposits, this enables
the encoder to continue operating normally in ink mists
environment.
Count (N): The number of bar and window pairs or
counts per revolution (CPR) of the codewheel. Or the
number of lines per inch of the codestrip (LPI)
1 shaft Rotation = 360 degrees
= N cycles
1 cycle (c) = 360 electrical degree, equivalent to 1 bar
and window pair.
Pulse Width (P): The number of electrical degree that
an output is high during one 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°
Phase (φ
φ): 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 (∆φ
∆φ): the deviation of the phase from its
∆φ
ideal value of 90°e.
Direction of Rotation: When the codewheel rotates
in the counter clockwise 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 (R op ): The distance from the
codewheel’s center of the rotation to the optical center
(O.C) of the encoder modules.
Angular Misalignment Error (E A ):
Angular
misalignment of the sensor in relation to the tangential
direction. This applies for both rotary and linear motion.
Mounting Position (RM): Distance from Motor Shaft
center of rotation to center of Alignment Tab receiving
hole.
2
AEDS-965x Series Block Diagram
Figure 1.
AEDS-965x Timing Diagram
Figure 1.
3
Absolute Maximum Ratings
Parameter
Symbol
Min.
Max.
Units
Notes
Storage Temperature
TS
-40
85
°C
Operating Temperature
TA
0
70
°C
Supply Voltage (Detector)
VCC
-0.5
7
Volts
Output Voltage
Vo
-0.5
Vcc
V
Output current per channel
Io
-1.5
10
mA
Soldering Temperature
TSOL
260
°C
t ≤ 7 sec
DC Forward
ILED
40
mA
VF < 3.0V
Reverse Voltage
VR
5
V
IR = 100µA
Subjecting the part to stresses beyond those listed under this section may cause permanent damage to the
device. These are stress ratings only and do not imply that the devices function beyond these ratings. Exposure
to the extremes of these conditions for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Symbol Min.
Typ.
Max.
Units
Temperature
TA
0
25
70
°C
Supply Voltage (Detector)
VCC
3.0
3.3 or 5.0
5.2
Volts
Load Capacitance
CL
100
pF
Pullup Resistor
Rpull
Count Frequency
Cf
Angular Misalignment
EA
Mounting Position
RM
DC Forward Current (LED)
@ Vcc = 3.3 V
ILED
none
-3.0
0.0
20
Ripple < 100mVpp
kΩ
Recommended no
pullup.
60
kHz
Velocity (rpm) x N/60
+3.0
Deg.
Mounting consideration
mm
(inch)
* Refer to mounting
consideration
mA
Recommended 33Ω
(±10%) series resistor
between 3.3V supply
and Vled.
ROP - 2.4
(Rop-0.095")
16
Notes
30
Electrical Characteristics
Electrical Characteristics over Recommend Operating Range, typical at 25°C
[email protected]
3.3V
Max.
Units
1.5
3.0
5
mA
2.4
3.3
5.2
V
Typ. IOH = -1.2 mA @ 3.3 V
0.4
V
Typ. IOL = 2mA @ 3.3V
50
ns
CL = 25 pF
50
ns
Parameter
Symbol Min.
Supply Current (Detector)
ICC
High Level Output Voltage
VOH
Low Level Output Voltage
VOL
Rise Time
tr
Fall Time
tf
LED Forward Voltage
VF
1.3 (turn on) 2.6
Note: Refer to Figure 2 for output waveform on tr and tf
4
3.0
V
Notes
Typical IF = 20mA
Encoding Characteristics
Encoding Characteristics over the Recommended
Operating Conditions and Mounting Conditions. These
characteristics do not include codewheel/codestrip
contribution.
3. Maximums are the worst case values predicted over
the full range of Recommended Mounting
Tolerances and Operating Conditions, with
consideration to population shift.
1. The typical values are average over the full rotation
of the codewheel at Nominal Mouting Position and
Typical Operating Conditions.
Parameter
Symbol Typ.
Max. Units
Pulse Width Error
∆P
7
40
e
Logic State Width Error
∆S
5
40
e
Phase Error
∆Φ
2
20
e
2. For a codestrip, the Typical Values are obtained at
zero angular displacement and Typical Operating
Conditions.
Mounting Configuration
Note:
These dimension includes 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 post shown above.
5
Mounting Configuration - Table
Error
Rop (Option P)=11.00mm
Rop (Option Q)=23.36mm
Unit
Notes
Recommend CW to put closer to the detector side
(upper side), in order to give enough margin for
encoder operation.
Eg
Gap
± 0.15
mm
Er
Radial
± 0.13
mm
Et
Tangential
± 0.13
mm
Ea
Angular
±3
Deg.
Package Dimension
AEDS-9650-X10 (Straight Lead)
6
AEDS-9651-X10 (Bent Lead)
7
Recommended Wave Solder Profile
Pb-free Wave Soldering Profile - Std-Profile 2
7 sec Max
260 °C
Temperature (°C)
A
B
C
Reflow
120°C/120 sec Max
Cool Down
Time (s)
Parameter
Min.
Max.
Nominal values
Units
A
Solder Pot Temperature
NA
260
250 - 260
°C
B
Preheat Zone Temperature
85
120
100 - 120
°C
C
Dip in Time
5
7
5
sec
D
Solder Pot Zone (Encoder Lead)
200
260
NA
°C
Note:
- Nominal values are evaluated profiles for optimum performance.
- Min/Max are critical limits to ensure encoders in good condition.
Ordering Information
Bracket Option
10
AEDS-965
Option
Lead Configuration
0 - Straight Leads
1 - Bent Leads
Resolution Option
P - 150 LPI
Q - 180 LPI
For product information and a complete list of distributors, please go to our web site:
www.avagotech.com
Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies, Limited in the United States and other countries.
Data subject to change. Copyright © 2006 Avago Technologies Pte. All rights reserved. Obsoletes AV01-0285EN
AV01-0506EN - September 29, 2006