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
0˚C to +70˚C operating temperature
Two-channel quadrature output
TTL 3.3 V CMOS compatible
Wave solderable
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.
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.
2
Absolute Maximum Ratings
Parameter Symbol Min. Max. Units Notes
Storage Temperature TS–40 85 ˚C
Operating Temperature TA070˚C
Supply Voltage (Detector) VCC –0.5 7 V
Output Voltage VO–0.5 VCC V
Output Current per Channel IO–1.5 10 mA
Soldering Temperature 260 ˚C t 5 sec.
DC Forward Current (LED) ILED 50 mA VF < 1.8 V
Reverse Voltage VR5VI
R
= 100 µA
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 90°e.
Pulse Width (P): The number of
electrical degrees 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°e.
Phase (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): The deviation
of the phase from its ideal value
of 90˚e.
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.
3
Recommended Operating Conditions
Parameter Symbol Min. Typ. Max. Units Notes
Temperature TA025 70˚C
Supply Voltage (Detector) VCC 2.8 3.3 5.2 V Ripple < 100 mV p-p
Load Capacitance CLnone 100 pF
Pullup Resistor RPULL none kRecommend no pullup. Device has
integrated 2.2 K on outputs.
Count Frequency f 40 kHz Velocity (rpm) x N/60
Angular Misalignment Error EA–3.0 0.0 +3.0 deg. Mounting Considerations
Mounting Position RMROP – 2.4 mm *Refer to Mounting Considerations
(ROP – 0.095") (inch)
DC Forward Current (LED) ILED 10 16 20 Recommended 110 (±10%)
@ VCC = 3.3 V series resistor between 3.3 V
supply and VLED.
Electrical Characteristics
Electrical Characteristics over Recommended Operating Range, Typical at 25˚C.
Parameter Symbol Min. Typ. @ 3.3 V Max. Units Notes
Supply Current ICC 23 5 mA
(Detector)
High Level Output VOH 2.4 3 3.6 V When VOH = 2.4 (min.)
Voltage Typical IOH = –0.4 mA @ 3.3 V
Low Level Output VOL 0.4 V When VOL = 0.4 (min.)
Voltage Typical IOH = 13 mA @ 3.3 V
Rise Time tr200 ns CL = 25 pF, RL = 11 k
Fall Time tf50 ns
LED Forward Voltage VF1.52 1.54 V
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 Symbol Typical Maximum Units
Pulse Width Error P 4 40 ˚e
Logic State Width Error S 5 40 ˚e
Phase Error ∆φ 415˚e
Note: Recommended no pullup. Device has integrated 2.2 k pullup resistor on Channel A & Channel B outputs.
4
Figure 1.
Figure 2.
C
P
S1 S2 S3 S4
2.4V
0.4V
CHANNEL B
CHANNEL A
t
r
t
f
ROTATION
AMPLITUDE
O
I
A
A
+
CHANNEL A
1
B
B
+
CHANNEL B
3
V
CC
2
GND
4
SIGNAL
PROCESSING
CIRCUITRY
V
LED
5
GND 6
LED
LENS
PHOTO-
DIODES
PULLUP RESISTOR
2.5 K x 2
COMPARATORS
EMITTER SECTION CODE
WHEEL DETECTOR SECTION
AEDS-962x SERIES BLOCK DIAGRAM
5
Parameter Min. Max. Nominal Values Units
A Solder Pot Temperature NA 260 240 - 250 °C
B Preheat Zone Temperature 85 110 90 - 105 ° C
C Dip in Time 2.5 5.0 2.5 - 4.5 sec
D Solder Pot Zone (PCB Top) NA 160 <160 ° C
E Solder Pot Zone (Encoder Lead) 200 NA 200 ° C
Notes:
I. Nominal values are evaluated profiles for optimum performance.
2. Min./Max. are critical limits to ensure encoders in good condition.
Figure 3. Recommended wave solder profile.
D
50
100
150
200
PH 3 PH 2 PH 1 PROCESS COOLING
DEGREES C
C
B
E
6
Figure 4. Mounting consideration.
Error Symbol Rop = 11.00 mm Unit Notes
Gap EG± 0.15 mm Recommend CW be put closer to the detector side (upper side),
in order to keep enough margin for encoder operation.
Radial ER± 0.26 mm
Tangential ET± 0.28 mm
Angular EA± 3 °C
R
M
2.05 MIN.
2XR
Ø 2.05 HOLE MIN.
1.0 DEEP MIN.
4.30 (0.169) MAX
4.50 (0.177) MIN.
R
OP
4.40 ± 0.15 (0.173 ± 0.006)
SEE NOTE
4.75 (0.187) MAX.
C OF ALIGNMENT TAB
L
R
M
± R
OP
- 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.
E
G
IMAGE SIDE OF CODEWHEEL / CODESTRIP
E
T
E
R
E
A
7
Package Dimensions
AEDS-9621
13.7 6.9
3.5
3.5
C – COUNTRY
OF ORIGIN
MARKING
(REFER -05
FOR DETAILS)
PART # (REFER -05)
RESOLUTION IDENTIFICATION
DATE CODE
OPTICAL CENTER MARK
XXXXX
CX
Agilent
10
0.5
R 1.1
1.4
5.6
11.0
4.1
0.5
2.0
0.5
0.254
(LEADFRAME
THICKNESS)
1.8
7.6
2.6
MAX. EXTERNAL
RADIUS R 0.5
4.40
2.00
(2 PLACES)
7.0
0.8
1.0
YYWW
CHAMFERED
LEAD-IN
(BOTH SIDES)
(OPTICAL
CENTER)
(EMITTER)
(DETECTOR)
1.10
2 – 2.10 ± 0.05
4.40
11.0 ± 0.2
13.1± 0.2
1.27
2.54 TYP.
2.00 TYP.
1.00
6 – 1.00
MOUNTING FOOTPRINT
CH A
CH B
V
CC
GND
V
CC
GND
XXXXX Agilent
10
YYWW
8
Package Dimensions
AEDS-9620
13.7 6.9
3.5
3.5
C – COUNTRY
OF ORIGIN
MARKING
(REFER -05
FOR DETAILS)
PART # (REFER -05)
RESOLUTION IDENTIFICATION
DATE CODE
OPTICAL CENTER MARK
XXXXX
CX
Agilent
10
0.5
R 1.1
1.4
5.6
11.0
4.1
0.5
2.0
0.5
0.254
(LEADFRAME
THICKNESS)
1.8
7.6
2.6
MAX. EXTERNAL
RADIUS R 0.5
4.40
2.00
(2 PLACES)
7.0
0.8
1.0
YYWW
CHAMFERED
LEAD-IN
(BOTH SIDES)
(OPTICAL
CENTER)
(EMITTER)
(DETECTOR)
1.10
1.27
2.54 TYP.
2.00 TYP.
1.00
6 – 1.00
MOUNTING FOOTPRINT
CH A
CH B
VCC
GND
VCC
GND
XXXXX Agilent
10
YYWW
LEAD PITCH
2.56
LEAD PITCH
2.00
9
Ordering Information
Bracket Options
10
Lead Configuration Resolution Options
2 – Linear 0 – Straight Leads 2 – 300 LPI, Linear
1 – Bent Leads
AEDS-96 Option
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Data subject to change.
Copyright © 2002 Agilent Technologies, Inc.
November 26, 2002
5988-8275EN