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HEDS-9040/9140
Three Channel Optical Incremental Encoder Modules
Data Sheet
Description Features
The HEDS-9040 and HEDS-9140 series are three channel Two channel quadrature output with index pulse
optical incremental encoder modules. When used with a
Resolution up to 2000 CPR (Counts Per Revolution)
codewheel, these low cost modules detect rotary position.
Low cost
Each module consists of a lensed LED source and a detec-
Easy to mount
tor IC enclosed in a small plastic package. Due to a highly
No signal adjustment required
collimated light source and a unique photodetector array,
Small size
these modules provide the same high performance found
in the HEDS-9000/9100 two channel encoder family. -40C to 100C operating temperature
TTL compatible
Package Dimensions
Single 5 V supply
HEDx-9xx0 Option
26.67 (1.05) 8.6 (0.34)
15.2
(0.60)
0.63 (0.025)
2.54 (0.100) TYP.
SQR. TYP.
1.8
1.52 (0.060)
OPTION CODE (0.07)
1.0 (0.04)
5.1 (0.20) 2.9
DATE CODE
2.21
6.9 (0.27)
(0.11) 11.9
(0.087)
2.54
3.73 0.05 (0.47)
20.8 (0.100)
(0.147 0.002)
(0.82)
1.02 0.10
11.7
(0.040 0.004)
8.81
(0.46)
4.75 0.10
5.8
(0.347)
45
(0.187 0.004)
(0.23)
OPTICAL
2.67 (0.105) DIA.
ALIGNING RECESS
CENTER LINE
MOUNTING THRU
ALIGNING RECESS
2.44/2.41 DIA.
C
HOLE 2 PLACES
1.85 (0.073) L 1.78 0.10* 5.46 0.10 2.44/2.41 X 2.79
(0.096/0.095) ALIGNING RECESS
(0.096/0.095 X 0.110)
2.16 (0.085) (0.070 0.004) (0.215 0.004) 2.44/2.41 DIA.
8.64 (0.340)
2.44/2.41 X 2.79
2.16 (0.085) DEEP
DEEP (0.096/0.095)
REF.
(0.096/0.095 X 0.110) 2.92 0.10**
17.27
2.16 (0.085) DEEP
2.16 (0.085) DEEP (0.115 0.004)
(0.680)
OPTICAL 4.11 (0.162)
10.16
20.96
CENTER
OPTICAL CENTER (0.400)
(0.825) 6.35 (0.250) REF.
TYPICAL DIMENSIONS IN
SIDE A MILLIMETERS AND (INCHES) SIDE B
* GAP MEASUREMENT TO THE SURFACE WINDOW = 1.68 0.10 (0.066 0.004)
** HEIGHT TO THE WINDOW = 3.02 0.10 (0.119 0.004)
HEDx-9xx1 Option
26.67 (1.05) 8.6 (0.34)
15.2
(0.60)
0.63 (0.025)
2.54 (0.100) TYP.
4.01 0.20
SQR. TYP.
(0.158 0.008)
1.8
OPTION CODE 1.0 (0.04) (0.07)
5.1 (0.20) 2.9
DATE CODE 2.21
(0.11)
(0.087)
2.54
3.73 0.05
(0.100)
(0.147 0.002) 16.76 0.20
(0.66 0.008)
1.02 0.10
11.7
(0.040 0.004)
8.81
(0.46)
4.75 0.10 5.8
(0.347)
45
(0.187 0.004) (0.23)
OPTICAL
2.67 (0.105) DIA.
ALIGNING RECESS
CENTER LINE
MOUNTING THRU
ALIGNING RECESS
2.44/2.41 DIA.
C
HOLE 2 PLACES
1.85 (0.073) L 1.78 0.10* 5.46 0.10 2.44/2.41 X 2.79
(0.096/0.095) ALIGNING RECESS
(0.070 0.004) (0.215 0.004) (0.096/0.095 X 0.110)
2.16 (0.085) 2.44/2.41 DIA.
8.64 (0.340)
2.44/2.41 X 2.79
2.16 (0.085) DEEP
DEEP (0.096/0.095)
REF.
(0.096/0.095 X 0.110) 2.92 0.10**
17.27
2.16 (0.085) DEEP
2.16 (0.085) DEEP (0.115 0.004)
(0.680)
OPTICAL 4.11 (0.162)
10.16
20.96
CENTER
OPTICAL CENTER (0.400)
(0.825) 6.35 (0.250) REF.
TYPICAL DIMENSIONS IN
SIDE A SIDE B
MILLIMETERS AND (INCHES)
* GAP MEASUREMENT TO THE SURFACE WINDOW = 1.68 0.10 (0.066 0.004)
** HEIGHT TO THE WINDOW = 3.02 0.10 (0.119 0.004)
ESD WARNING: NORMAL HANDLING PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.
V V
CC CC
5 CH. B 5 CH. B
4 V 4 V
CC CC
3 CH. A 3 CH. A
2 N.C. 2 N.C.
1 GND 1 GND
GND GND
HEDS-9X01
HEDS-9X00The HEDS-9040 and 9140 have two channel quadrature
Theory of Operation
outputs plus a third channel index output. This index
The HEDS-9040 and 9140 are emitter/detector modules.
output is a 90 electrical degree high true index pulse
Coupled with a codewheel, these modules translate the
which is generated once for each full rotation of the
rotary motion of a shaft into a three-channel digital out-
codewheel.
put.
The HEDS-9040 is designed for use with a HEDX-614X
As seen in the block diagram, the modules contain a
codewheel which has an optical r adius of 23.36 mm
single Light Emitting Diode (LED) as its light source. The
(0.920 inch). The HEDS-9140 is designed for use with a
light is collimated into a parallel beam by means of a
HEDx-5x4x codewheel which has an optical radius of
single polycar bon a te lens located directly over the LED.
11.00 mm (0.433 inch).
Opposite the emitter is the integrated detector circuit.
The quadrature signals and the index pulse are accessed
This IC consists of multiple sets of photodetect ors and
through five 0.025 inch square pins located on 0.1 inch
the signal processing circuitry necessary to produce the
centers.
digital waveforms.
Standard resolutions between 256 and 2000 counts per
The codewheel rotates between the emitter and detector,
revolution are available. Consult local Avago sales repre-
causing the light beam to be interrupted by the pattern
sentatives for other resolutions.
of spaces and bars on the codewheel . The photodiodes
which detect these interrup tions are arranged in a pat-
Applications
tern that corresponds to the radius and design of the
codewheel . These detectors are also spaced such that a
The HEDS-9040 and 9140 provide sophisticated motion
light period on one pair of detectors corresponds to a
control detection at a low cost, making them ideal for
dark period on the adjacent pair of detectors. The photo-
high volume applications. Typical applica tions include
diode outputs are then fed through the signal process-
printers, plotters, tape drives, and industrial and factory
ing circuitry resulting in A, A, B, B, I and I. Comparators
automation equipment.
receive these signals and produce the final outputs for
Note: Avago Technologies encoders are not recommend-
channels A and B. Due to this integrated phasing tech-
ed for use in safety critical applications. Eg. ABS braking
nique, the digital output of channel A is in quadrature
systems, power steering, life support systems and critical
with that of channel B (90 degrees out of phase).
care medical equipment. Please contact sales represen-
The output of the comparator for I and I is sent to the in-
tative if more clarification is needed.
dex processing circuitry along with the outputs of chan-
nels A and B. The final output of channel I is an index
pulse P which is generated once for each full rotation of
O
the codewheel. This output P is a one state width (nomi-
O
nally 90 electrical degrees), high true index pulse which
is coincident with the low states of channels A and B.
2