HEDR-8000 Series, HEDR-8100 Series, HEDR-8010 Series
Reective Optical Surface Mount Encoders
Technical Data
Features
• Reective Technology
• Surface Mount SO-8 Package
• Two Channel Quadrature Outputs for Direction Sens-
ing
• Two Encoding Resolution Options:
– 2.76 – 2.95 Lines/mm
(70 – 75 Lines/inch)
– 5.91 Lines/mm
(150 Lines/inch)
Description
The HEDR-8000/8100 Series encoders use reflective
technology to sense rotary or linear position. This sen-
sor consists of an LED light source and a photodetector
IC in a single SO-8 surface mount package. When used
with a reective codewheel or codestrip, this device can
sense rotary or linear position.
ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.
Outline Drawing
NOTE: HEDR-8000 series products are classied as MSL Level 3.
6.2 ± 0.20
(0.244 ± 0.008)
1.270
(0.050)
1 2 3 4
8 7 6 5
TYP.
HEDR-8000 outline drwg
3.94 ± 0.13 *
(0.155 ± 0.005)
1.97
(0.078) REF.
REF.
0.38 ± 0.08
(0.016 ± 0.003)
3.18 ± 0.13
(0.125 ± 0.005)
5.08 ± 0.13 *
(0.200 ± 0.005)
1.40 ± 0.02
(0.055 ± 0.001)
1.52
(0.06) REF.
PIN ONE
INDICATOR
LOCATION
0.025
(0.001) MIN.
1.84
(0.072) REF.
0.700 R
(0.0276) REF. LEAD COPLANARITY ± 0.051
(0.002)
0.23 ± 0.03
(0.009 ± 0.001)
0.59
(0.023) MIN.
0.18 ± 0.08
(0.007 ± 0.003)
1
2
3
4
8
7
6
5
NC
GND
A
VCC
VLED
NC
B
GND
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.
2
Block Diagram
The reective surface mount optical encoders provide
two square wave outputs in quadrature for count and
direction information. These TTL compatible outputs
correspond to the alternating reective/non-reective
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 reective 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 mo-
tion 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 read-
ers, 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 clarication 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 reective sen-
sors translates rotary or linear motion into a two chan-
nel digital output.
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 congured 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
reected or not reected back to the lens over the pho-
todetector 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 photodi-
odes. 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 nal outputs for channels A and B.
HEDR-8000 block diag
VLED
GND
VCC
CH A
CH B
GND
SIGNAL
PROCESSING
CIRCUITRY
RCODEWHEEL
OR
CODESTRIP
3
Output Waveforms
Denitions
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]).
One Cycle (C): 360 electrical degrees (°e), 1 bar and win-
dow pair.
One Shaft Rotation: 360 mechanical degrees, N cycles
(rotary motion only).
Line Density: The number of reective and non-reec-
tive pairs per unit length, expressed as either lines per
inch (LPI) or lines per mm (LPmm).
Pulse Width (P): The number of electrical degrees that
an output is high during one cycle, nominally 180°e or
1/2 a cycle.
Pulse Width Error (∆P): The deviation in electrical de-
grees of the pulse width from its ideal value of 180°e.
State Width (S): The number of electrical degrees be-
tween 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 de-
grees 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 on channel A and the center
of the high state on channel B. This value is nominally
90°e.
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 reective codewheel or codestrip.
Specular Reectance (Rf ): a measure of a surface’s re-
ective nish. This is quantied by the amount of light
reected when hit with an incident beam. A device
called a scatterometer is used to quantify specular re-
ectance on a percent scale. (Contact factory for more
information.)
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.
HEDR-8000 angular misalign.
HEDR-8000
SHAFT
CODEWHEEL
RADIAL
TANGENTIAL
HEDR-8000
SHAFT
CODEWHEEL
EA
HEDR-8000 output wave.
S1 S2 S3 S4 f
P
C
CH. B
CH. A
ALL FOUR STATES (S1 TO S4)
ARE MAINTAINED.
CODEWHEEL ROTATION OR LINEAR MOVEMENT
AMPLITUDE
4
Absolute Maximum Ratings
Storage Temperature, TS -40°C to 85°C
Operating Temperature, T
A -10°C to 85°C
Supply Voltage, V
CC -0.5 V to 7 V
Output Voltage, V
O -0.5 V to V
CC
Output Current per Channel, IOUT -1.0 mA to 5 mA
Note: Exposure to extreme light intensity (such as from ashbulbs or spotlights) can cause permanent damage to device.
Encoding Characteristics
Encoding Characteristics Over the Recommended Operating Conditions and Mounting Conditions.
Parameter Symbol Typical Maximum Units Notes
Pulse Width Error ∆P 15 55 °e HEDR-8010
Pulse Width Error (Ch.A,Ch.B) ∆P 16 75 °e HEDR-8100
Phase Error ∆φ 10 60 °e HEDR-8100
Pulse Width Error (Ch.A,Ch.B) ∆P 15,25 55,75 °e HEDR-8000
Phase Error ∆φ 12 60 °e HEDR-8000
Note:
Typical Value was obtained at typical condition. Maximums were obtained over all range of recommended operating condition and mounting
condition.
Recommended Operating Conditions
Parameter Symbol Min. Typ. Max. Units Notes
Temperature T
A -10 85 °C
Supply Voltage V
CC 4.5 5.0 5.5 Volts Ripple < 100 mVp-p
LED Current ILED 13 15 18 mA See “Current Limiting
Resistor for LED”
Load Capacitance CL 100 pF 2.7 KΩ Pull-Up
Count Frequency f 15 kHz Velocity (rpm) x N/60
Radial Misalignment ER ±0.38 mm
(±0.015) (in.)
Tangential Misalignment ET ±0.38 mm
(±0.015) (in.)
Angular Misalignment EA 0 ±1.5 deg.
Codewheel or Codestrip G 1.52 2.03 2.54 mm HEDR-8000
Gap (0.060) (0.080) (0.100) (in.) HEDR-8010
G 1.02 1.52 2.03 mm HEDR-8100
(0.040) (0.060) (0.080) (in.)
Codewheel or Codestrip Rf 60% As Measured on TMA
Specular Reectance µscan Scope (see Note 1)
Codewheel/Codestrip Tilt CT 0 1 deg.
Codewheel/Codestrip LPmm 2.76 2.95 lines/mm HEDR-8000
Resolution (LPI) (70) (75) (lines/in.) HEDR-8010
LPmm 5.91 lines/mm HEDR-8100
(LPI) 150 (lines/in.)
Notes:
1. Contact factory for more information regarding measurement of specular reectance.
5
Parameter Symbol Min. Max. Units Notes
Window/Bar Ratio Ww/Wb 0.9 1.1
Specular Reectance Rf 60 85 Reective Bars
– 10 Non-reective Bars
Line Density LPmm 2.76 2.95 lines/mm HEDR-8000
(LPI) (70) (75) (lines/inch) HEDR-8010
LPmm 5.91 7.09 lines/mm HEDR-8100
(LPI) (150) (180) (lines/inch)
Window Length Lw 1.80 2.31 mm (inches) mm
(0.071) (0.091) (inches)
Contact factory for further information on compatible codewheel and codestrips.
Electrical Characteristics
Electrical Characteristics Over Recommended Operating Conditions. Typical Values at 25°C.
Parameter Symbol Min. Typ. Max. Units Notes
Supply Current ICC 2.2 5.0 mA
High Level Output Voltage V
OH 2.4 V IOH = -40 µA min.
Low Level Output Voltage VOL 0.4 V IOL = 3.86 mA
Rise Time tr 150 200 ns CL = 25 pF
RL = 2.7 KΩ
Fall Time tf 50 60 ns
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 (V
LED). This will result in an LED current of approxi-
mately 15 mA.
Recommended Codewheel and Codestrip Characteristics
HEDR-8000 codewheel
ROP
WbWw
Lw
Lw
WwWb
6
IR Soldering Conditions
The following recommended IR soldering prole meets
the specications of the Electronic Industries Associa-
tion of Japan (EIAJ):
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
Mounting Conditions
*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.
HEDR-8000 mounting
ROP
1
2
3
4
8
7
6
5
2.03 ± 0.51
(0.080 ± 0.020)
11.00 mm (0.433 IN.) < ROP < ¥
HEDR-8000 soldering
90 ± 30 S
30 ± 10 S
10 ± 1 S
235 C MAX.
230 C ± 5 C
200 C
TIME (S)
TEMPERATURE ( C)
150 C ± 10 C
7
06 12
HEDR-5120# E *
H * *
Ordering Information
A. Modules
B. Codewheel: reective
HEDR-5120 OPT ROP = 11 mm, 2 channels
Resolution (Cycle/Rev) Shaft Diameter
E = 200 CPR 06 = 1/4 in.
H = 408 CPR 1/2 = 6 mm
*
HEDR-8
Resolution Type
0 = Low resolution
1 = High resolution
00 OPT 2
Lines/Inch Units in Shipping
0 = 50 units (Tube)
2 = 3 units (Tube)
3 = 100 units (Tube-Designers Kit)
4 = 1500 units (Tape and Reel)
5 = 500 units (Tape and Reel)
K = 75 LPI
P = 150 LPI
Q = 180 LPI
0 2 3 4 5
HEDR-8000#2K * * * *
HEDR-8100#2P * * * * *
HEDR-8100#2Q * *
HEDR-8010#2K *
In order to achieve the reective 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.
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, Pte. in the United States and other countries.
Data subject to change. Copyright © 2006 Avago Technologies Pte. All rights reserved.
5988-9452EN - May 29, 2006