HEDB-9100 and HEDB-9000
Two Channel Optical Incremental Encoder
Modules Bundle With Codewheel
Data Sheet
Description
The HEDB-9100 and HEDB-9000 series are two channel
optical incremental encoder modules offered with a
codewheel. When used with a codewheel, these low
cost modules detect rotary position. Each module
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, these modules are extremely
tolerant to mounting misalignment.
The HEDB-9100 and 9000 has two channel quadrature
outputs.
The HEDB-9100 is designed for use with a HEDS-5120
codewheel which has an optical radius of 11.00 mm
(0.433 inch).The HEDB-9000 is designed for use with a
HEDS-6100 codewheel which has an optical radius of
23.36 mm (0.920 inch).
The quadrature signals and the single 5V supply input
are accessed through five 0.025 inch square pins
located on 0.1 inch (pitch) centers.
Features
•
High Performance
•
Resolution from 96 CPR Up To 1000 CPR (Counts
Per Revolution)
•
Low Cost
•
Easy to Mount
•
No Signal Adjustment required
•
Small Size
•
Operating Temperature: -40
o
C to 100
o
C
•
TTL Compatible
•
Two Channel Quadrature Output
•
Single 5V Supply
Applications
The HEDB-9100 and 9000 provide sophisticated motion
control detection at a low cost, making them ideal for
high volume applications. Typical applications include
printers, plotters, tape drives, and industrial and factory
automation equipment.
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.
1
Theory of Operation
The HEDB-9100 and 9000 is emitter/detector modules.
Coupled with a codewheel, these modules translate
the rotary motion of a shaft into a two-channel digital
output.
As seen in Figure 1, the modules contain a single Light
Emitting Diode (LED) as its light source. The light is
collimated into a parallel beam by means of a single
polycarbonate 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 rotates between the emitter and
detector, causing the light beam to be interrupted by
the pattern of spaces and bars on the codewheel.
The photodiodes which detect these interruptions are
arranged in a pattern that corresponds to the radius
and design of the code-wheel. These detectors are also
spaced such that a light period on one pair of detectors
corresponds to a dark period on the adjacent pair of
detectors.
The photodiode outputs are then fed through the
signal processing circuitry resulting in A, Abar, B, Bbar.
Two comparators receive these signals and produce
the final outputs for channels A and B. Due to this
integrated phasing technique, the digital output of
channel A is in quadrature with that of 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.
Position Error (∆Θ
The normalized angular difference
∆Θ):
∆Θ
between the actual shaft position and the position
indicated by the encoder cycle count.
Cycle Error (∆C):
An indication of cycle uniformity. The
∆
difference between an observed shaft angle which
gives rise to one electrical cycle, and the nominal
angular increment of 1/N of a revolution.
Pulse Width (P):
The number of electrical degrees that
an output is high during 1 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.
Phase (φ):
The number of electrical degrees between
φ
the center of the high state of channel A and the center
of the high state of channel B. This value is nominally
90°e for quadrature output.
Phase Error (φ):
The deviation of the phase from its
φ
ideal value of 90°e.
Direction of Rotation:
When the codewheel rotates
in the clockwise direction viewing from top of the
module (direction from V to G), channel A will lead
channel B. If the codewheel rotates in the opposite
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.
Specification
For encoder electrical, mechanical specifications,
codewheel technical specifications and additional
informations pls refer to :
•
HEDS-9000 /9100 Datasheet.
•
HEDS/HEDG/HEDM – 51xx /61xx Codewheel
Datasheet
2
Bundle Part Number Breakdown List
Note :
The bundle part HEDB-9100/9000 consists of HEDS-9100/9000 and HEDS-5120/6100.
The diagram below provides the breakdown list.
HEDB - 9100 - CPR
Shaft Diameter
00
Encoder Module : HEDS-9100 - CPR
Codewheel : HEDS - 5120 - CPR
Shaft Diameter
HEDB - 9000 - CPR
Shaft Diameter
00
Encoder Module : HEDS-9000 - CPR
Codewheel : HEDS - 6100 - CPR
Shaft Diameter
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.
5989-4045EN - May 29, 2006
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