AVAGO HEDR

HEDR-8000 Series
Reflective Optical Surface Mount Encoders
Data Sheet
HEDR-8000 Series, HEDR-8100 Series
HEDR-8010 Series
Description
Features
The HEDR-8000/8100 Series encoders use reflective
technology to sense rotary or linear position. This
sensor consists of an LED light source and a
photodetector IC in a single SO-8 surface mount
package. When used with a reflective codewheel or
codestrip, this device can sense rotary or linear position.
• Reflective technology
• Surface mount SO-8 Package
• Two channel quadrature outputs for direction sensing
• Two encoding resolution options:
– 2.76 – 2.95 lines/mm
(70 – 75 lines/inch)
– 5.91 lines/mm
(150 lines/inch)
NOTE: HEDR-8000 series products are classified
as MSL Level 3.
Outline Drawing
8
7
6
5
1 NC
6.2 ± 0.20
(0.244 ± 0.008)
3.94 ± 0.13 *
(0.155 ± 0.005)
1
2
3
1.270 TYP.
(0.050)
0.38 ± 0.08
(0.016 ± 0.003)
5.08 ± 0.13 *
(0.200 ± 0.005)
1.84 REF.
(0.072)
3.18 ± 0.13
(0.125 ± 0.005)
0.700 R REF.
(0.0276)
NC
7
B
6
GND
5
2 GND
4 VCC
4
PIN ONE
INDICATOR
LOCATION
8
3 A
1.97 REF.
(0.078)
REF.
VLED
1.40 ± 0.02
(0.055 ± 0.001)
NOTES:
*FLASH MAY ADD 0.38 (0.015) MAX.
AT PARTING LINE.
DIMENSIONS IN MILLIMETERS (INCHES).
FOR THE 1CHANNEL HEDR-8010, PIN 6
IS CONSIDERED NC.
0.025 MIN.
(0.001)
0.23 ± 0.03
(0.009 ± 0.001)
1.52 REF.
(0.06)
LEAD COPLANARITY ± 0.051
(0.002)
0.18 ± 0.08
(0.007 ± 0.003)
0.59 MIN.
(0.023)
ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC
DISCHARGE.
The reflective surface mount
optical encoders provide two
square wave outputs in quadrature for count and direction
information. These TTL
compatible outputs correspond to
the alternating reflective/nonreflective pattern of the
codewheel or codestrip.
The HEDR-8000/8100 series
encoders can be used over a
range of codewheel and codestrip
resolutions. The HEDR-8000/
8100 reflective encoder can
operate from 2.76 to 2.95 lines
per mm (70 to 75 lines per inch).
The HEDR-8100 can be used with
a codewheel or codestrip with
150 lines per inch (5.91 lines
per mm).
Applications
The HEDR-8000/8100 series
provides two channel motion
sensing at a very low cost, making
it ideal for high volume
applications. Its small size and
surface mount capability make it
ideal for printers, copiers, card
readers, and consumer product
applications.
Note: Avago 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.
Theory of Operation
The HEDR-8000/8100 series
combines an emitter and a
detector in a single surface mount
SO-8 package. When used with a
codewheel or codestrip, the
reflective sensors translates
rotary or linear motion into a two
channel digital output.
Block Diagram
VLED
R
GND
VCC
CH A
CH B
GND
2
SIGNAL
PROCESSING
CIRCUITRY
CODEWHEEL
OR
CODESTRIP
As seen in the block diagram, the
HEDR-8000/8100 series has three
key parts: a single light emitting
diode (LED) light source, a
photodetector IC with a set of
uniquely configured photodiodes,
and a pair of lenses molded into
the package. The lens over the
LED focuses light onto the
codewheel or codestrip. Light is
either reflected or not reflected
back to the lens over the
photodetector IC.
As the codewheel rotates or
codestrip passes by, an alternating pattern of light and dark
corresponding to the pattern of
the codewheel falls upon the
photodiodes. This light is used to
produce internal signals A and A,
and B and B. As part of this
“push-pull” detector system, these
signals are fed through comparators to produce the final outputs
for channels A and B.
Definitions
Pulse Width (P): The number of
electrical degrees that an output
is high during one cycle,
nominally 180°e or 1/2 a cycle.
Count (N): For rotary motion,
the number of bar and window
pairs or counts per revolution
(CPR) of the codewheel. For
linear motion, the number of bar
and window pairs per unit length
(lines per inch [LPI] or lines per
mm [LPmm]).
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.
One Cycle (C): 360 electrical
degrees (°e), 1 bar and window
pair.
One Shaft Rotation: 360
mechanical degrees, N cycles
(rotary motion only).
State Width Error (∆S): The
deviation in electrical degrees of
each state width from its ideal
value of 90°e.
Line Density: The number of
reflective and non-reflective pairs
per unit length, expressed as
either lines per inch (LPI) or lines
per mm (LPmm).
RADIAL
EA
TANGENTIAL
HEDR-8000
HEDR-8000
SHAFT
SHAFT
CODEWHEEL
CODEWHEEL
ALL FOUR STATES (S1 TO S4)
ARE MAINTAINED.
P
CH. A
AMPLITUDE
S1
S2
S3
S4
φ
CH. B
CODEWHEEL ROTATION OR LINEAR MOVEMENT
3
Phase Error (∆φ): The deviation
in electrical degrees of the phase
from its ideal value of 90°e.
Direction of Rotation: When the
codewheel or codestrip moves in
the direction from pin 1 to pin 4,
as viewed when looking down on
the lenses, channel B will lead
channel A. If the codewheel or
codestrip moves in the opposite
direction, channel A will lead
channel B.
Optical Radius (Rop): For rotary
motion, the distance from the
codewheel’s center of rotation to
the center line connecting the two
lenses of the encoder.
Gap (G): The distance from the
top of the package to the surface of
the reflective codewheel or
codestrip.
Specular Reflectance (Rf): a
measure of a surface’s reflective
finish. This is quantified by the
amount of light reflected when hit
with an incident beam. A device
called a scatterometer is used to
quantify specular reflectance on a
percent scale. (Contact factory for
more information.)
Output Waveforms
C
Phase (φ): The number of
electrical degrees between the
center of the high state on channel
A and the center of the high state
on channel B. This value is
nominally 90°e.
Radial and Tangential
Misalignment Error (ER, ET):
For rotary motion, mechanical
misalignment in the radial and
tangential directions relative to the
codewheel.
Angular Misalignment Error
(EA): angular misalignment of the
sensor in relation to the tangential
direction. This applies for both
rotary and linear motion.
Absolute Maximum Ratings
Storage Temperature, TS
Operating Temperature, TA
Supply Voltage, VCC
Output Voltage, VO
Output Current per Channel, IOUT
-40°C to 85°C
-10°C to 85°C
-0.5 V to 7 V
-0.5 V to VCC
-1.0 mA to 5 mA
Note: Exposure to extreme light intensity (such as from flashbulbs or spotlights) can cause
permanent damage to device.
Recommended Operating Conditions
Parameter
Temperature
Symbol
TA
Min.
-10
Typ.
Max.
85
Units
°C
Notes
Supply Voltage
LED Current
VCC
ILED
4.5
13
5.0
15
5.5
18
Volts
mA
Load Capacitance
Count Frequency
Radial Misalignment
CL
f
ER
Tangential Misalignment
ET
Angular Misalignment
Codewheel or Codestrip
Gap
EA
G
0
2.03
(0.080)
1.52
(0.060)
100
15
±0.38
(±0.015)
±0.38
(±0.015)
±1.5
2.54
(0.100)
2.03
(0.080)
pF
kHz
mm
(in.)
mm
(in.)
deg.
mm
(in.)
mm
(in.)
Ripple < 100 mVp-p
See “Current Limiting
Resistor for LED”
2.7 KΩ Pull-Up
Velocity (rpm) x N/60
G
Codewheel or Codestrip
Specular Reflectance
Codewheel/Codestrip Tilt
Codewheel/Codestrip
Resolution
Rf
CT
LPmm
(LPI)
LPmm
(LPI)
1.52
(0.060)
1.02
(0.040)
60%
HEDR-8000
HEDR-8010
HEDR-8100
As Measured on TMA
µscan Scope (see Note 1)
0
1
2.95
(75)
2.76
(70)
5.91
150
deg.
lines/mm
(lines/in.)
lines/mm
(lines/in.)
HEDR-8000
HEDR-8010
HEDR-8100
Note:
1. Contact factory for more information regarding measurement of specular reflectance.
Encoding Characteristics
Encoding Characteristics over the Recommended Operating Conditions and Mounting Conditions.
Parameter
Pulse Width Error
Pulse Width Error (Ch.A,Ch.B)
Phase Error
Pulse Width Error (Ch.A,Ch.B)
Phase Error
Symbol
∆P
∆P
∆f
∆P
∆f
Typical
15
16
10
15,25
12
Maximum
55
75
60
55,75
60
Units
°e
°e
°e
°e
°e
Notes
HEDR-8010
HEDR-8100
HEDR-8100
HEDR-8000
HEDR-8000
Note:
Typical Value was obtained at typical condition. Maximums were obtained over all range of recommended operating condition and mounting condition.
4
Electrical Characteristics
Electrical Characteristics over Recommended Operating Conditions. Typical Values at 25°C.
Parameter
Symbol
Supply Current
ICC
High Level Output Voltage
VOH
Low Level Output Voltage
VOL
Rise Time
tr
Fall Time
tf
Min.
Typ.
Max.
Units
2.2
5.0
mA
Notes
V
IOH = -40 µA min.
0.4
V
IOL = 3.86 mA
150
200
ns
CL = 25 pF
RL = 2.7 KΩ
50
60
ns
2.4
Current Limiting Resistor
for LED
A resistor to limit current to the
LED is required. The recommended value is 220 Ω (± 10%)
and should be placed in series
between the 5 V supply and pin 8
of the device (VLED). This will
result in an LED current of
approximately 15 mA.
Recommended Codewheel and Codestrip Characteristics
Wb
Ww
Lw
ROP
Lw
W w Wb
Parameter
Window/Bar Ratio
Specular Reflectance
Symbol
Ww/Wb
Rf
Line Density
LPmm
(LPI)
LPmm
(LPI)
Lw
Window Length
Min.
0.9
60
–
2.76
(70)
5.91
(150)
1.80
(0.071)
Max.
1.1
85
10
2.95
(75)
7.09
(180)
2.31
(0.091)
Contact factory for further information on compatible codewheel and codestrips.
5
Units
lines/mm
(lines/inch)
lines/mm
(lines/inch)
mm (inches)
Notes
Reflective Bars
Non-reflective Bars
HEDR-8000
HEDR-8010
HEDR-8100
mm
(inches)
Mounting Conditions
1
2
3
4
IR Soldering Conditions
The following recommended IR
soldering profile meets the
specifications of the Electronic
Industries Association of Japan
(EIAJ):
8
7
6
5
1. 150 ± 10°C for 90 ± 30 seconds
2. Greater than 200°C for 30
± 10 seconds
3. 230°C ± 5°C for 10 ± 1 second
30 ± 10 S
11.00 mm (0.433 IN.) < ROP < ∞
*
2.03 ± 0.51
(0.080 ± 0.020)
TEMPERATURE (°C)
ROP
10 ± 1 S
235°C MAX.
230°C ± 5°C
200°C
90 ± 30 S
150°C ± 10°C
*These dimensions are for HEDR-8000.
Please refer to “Recommended Operating
Conditions” table for HEDR-8100.
RECOMMENDATION: Please
refer to Application Note 1079:
Design and Performance
Considerations with HEDR-8000
for additional product
information.
6
TIME (S)
Ordering Information
A. Modules
HEDR-8
OPT 2
00
Resolution Type
Lines/Inch
Units in Shipping Tube
0 = Low resolution
1 = High resolution
K = 75 LPI
P = 150 LPI
Q = 180 LPI
0 = 50 units
2 = 3 units (Designers kit)
3 = 100 units
4 = 1500 units
5 = 500 units
0
2
3
4
HEDR-8000#2K
*
*
*
*
HEDR-8100#2P
*
*
*
*
*
*
*
HEDR-8100#2Q
HEDR-8010#2K
5
*
B. Codewheel: reflective
HEDR-5120 OPT
Shaft Diameter
E = 200 CPR
H = 408 CPR
06 = 1/4 in.
1/2 = 6 mm
E
*
H
*
12
*
In order to achieve the reflective
codewheel resolution stated, refer
below for suitable encoder
recommendation.
1. HEDR-5120#Exx, 200CPR to
be used with option K, 75LPI of
the encoder.
2. HEDR-5120#Hxx, 408CPR to
be used with option P, 150LPI of
the encoder.
7
ROP = 11 mm, 2 channels
Resolution (Cycle/Rev)
06
HEDR-5120#
*
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www.avagotech.com
Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies, Pte. in the United States and other countries.
Data subject to change. Copyright © 2006 Avago Technologies Pte. All rights reserved. Obsoletes 5988-5310EN
5988-9452EN May 9, 2006