HP HEDS-9711R-200LPI50 200 lpi analog output small optical encoder module Datasheet

Agilent HEDS-9710, HEDS-9711
200 lpi Analog Output
Small Optical Encoder Modules
Data Sheet
Description
The HEDS-9710/HEDS-9711 series
is a high performance, low cost,
optical incremental encoder module. When operated in conjunction
with either a codewheel or
codestrip, this module detects rotary or linear position. The encoder
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, the module is extremely tolerant to mounting misalignment.
The two-channel analog outputs and
5 V supply input are accessed
through four solder-plated leads
located on 2.54 mm (0.1 inch)
centers.
The standard HEDS-9710/HEDS9711 is designed for use with an
appropriate optical radius
codewheel, or linear codestrip.
Please contact the factory for
more information.
Features
• Small size
• Multiple mounting options
• 200 lpi resolution
• Linear and rotary options available
• Insensitive to radial and axial play
• 15°C to 45°C operating temperature
• Two-channel analog output
• Single 5 V supply
• Wave solderable
Applications
The HEDS-9710/HEDS-9711
provides sophisticated motion
detection at a low cost, making
closed-loop control very costeffective. 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, power steering, life
support systems, and critical care
medical equipment. Please contact
sales representative if more
clarification is needed.
Theory of Operation
The HEDS-9710/HEDS-9711 is a
C-shaped emitter/detector module. Coupled with a codewheel, it
translates rotary motion into a
two-channel analog output.
Coupled with a codestrip, it translates linear motion into analog
outputs.
ESD WARNING: NORMAL PRECAUTIONS SHOULD BE TAKEN TO AVOID STATIC DISCHARGE.
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
analog 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 detectors
corresponds to a dark period on
the adjacent pair of detectors.
The photodiode outputs are fed
through the signal processing
circuitry, which produces the
final outputs for channels A and
B. Due to this integrated phasing
technique, the analog output of
channel A is in quadrature with
channel B (90 degrees out of
phase).
Package Dimensions
See HEDS-9700 datasheet for
package outline drawings.
State Width Error (∆S): The
deviation, in electrical degrees, of
each state width from its ideal
value of 90°e.
Definitions
Count (N): The number of bar
and window pairs or Counts Per
Revolution (CPR) of the codewheel, or the number of Lines Per
Inch (LPI) of the codestrip.
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. This value is nominally 90°e for quadrature output.
1 Shaft Rotation = 360 mechanical
degrees
= N cycles
Phase Error (∆Φ): The deviation of the phase from its ideal
value of 90°e.
1 cycle (c) = 360 electrical
degrees (°e)
= 1 bar and window pair
Direction of Rotation: When
the codewheel rotates counterclockwise, as viewed looking
down on the module (so the
marking is visible), channel A will
lead channel B. If the codewheel
rotates in the opposite direction,
channel B will lead channel A.
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.
Optical Radius (ROP): The
distance from the codewheel’s
center of rotation to the optical
center (O.C.) of the encoder
module.
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 four states per cycle, each
nominally 90°e.
Mounting Position (RM):
Distance from Motor Shaft center
of rotation to center of Alignment
Tab receiving hole.
Absolute Maximum Ratings
Parameter
Symbol
Min.
Max.
Units
Storage Temperature
TS
–40
85
°C
Operating Temperature
TA
15
45
°C
Supply Voltage
VCC
–0.5
7
V
260
°C
Soldering Temperature
Notes
t ≤ 5 sec.
Recommended Operating Conditions
Parameter
Symbol
Min.
Max.
Temperature
T
15
45
Supply Voltage
VCC
4.8
Count Frequency
2
Units
Notes
5.2
V
Ripple < 100 mVp-p
8
kHz
(Velocity (rpm) x N) 60
Waveform Definition
ANALOG
Iap
Ibp
A
B
Iam
Ibm
DIGITAL
A
B
P
P
S1
S2
S3
S4
Name
Paramenter
Analog Peak
Definition
Label
The absolute value in µA of the magnitude of the
analog signal (i.e., one-sided reading).
Iap, Ibp,
Iam, Ibm
Iapp
Ibpp
Analog Peak-to-Peak
Ipp
The peak-to-peak signal magnitude in µA of the
analog signal.
Analog Offset
Ioffset
The offset in µA from the mid-point of the analog
peak-to-peak signal to the zero current point.
State Width
State Width
The number of electrical degrees between a transition
in channel A and the neighboring transition in channel B.
There are four states per cycle, each nominally 90°e.
The transitions are determined by where the analog
signal crosses the Zero point.
State Width Error
State Width Error
The deviation, in electrical degrees, of each state width
from its ideal value of 90°e.
Pulse Width
Pulse Width
The number of electrical degrees that an analog output
is greater than zero during one cycle. This value is
nominally 180°e or 1/2 cycle.
Pulse Width Error
Pulse Width Error The deviation, in electrical degrees, of each pulse width
from its ideal value of 180°e.
State 1
State 2
State 3
State 4
P
Electrical Characteristics
Electrical Characteristics over Recommended Operating Range, Typical at 25°C.
3
Parameter
Symbol
Supply Current
ICC
Min.
Typ.
Max.
Units
17
40
mA
Notes
Encoding Characteristics
Encoding Characteristics over Recommended Operating Range and
Recommended Mounting Tolerances.
These characteristics do not include codewheel/codestrip contributions.
Units
Radial
microns
± 130
Tangential
microns
± 130
Gap
microns
50 – 250
Temperature
°C
15 – 45
O.R.
mm
18 – Linear
CPR
count
900 – Linear
Codewheel Slot/Spoke
ratio
0.9 – 1.1
Min.
Max.
Ipp
µA
10
73
Ioffset
µA
–4
+4
State Width Error
e°
–40
+40
Pulse Width Error
e°
–40
+40
Recommended Codewheel and Codestrip Characteristics
Parameter
Symbol
Min.
Max.
Window/Bar Ratio
Ww/Wb
0.9
1.1
Window Length (Rotary)
Lw
1.80
(0.071)
2.30
(0.091)
mm
(inch)
Absolute Maximum Codewheel
Radius (Rotary)
Rc
Rop + 3.40
(Rop + 0.134)
mm
(inch)
Center of Post to Inside
Edge of Window
W1
1.04
(0.041)
mm
(inch)
Center of Post to Outside
Edge of Window
W2
0.76
(0.030)
mm
(inch)
Center of Post to Inside Edge
of Codestrip
4
L
3.60
(0.142)
Units
mm
(inch)
Notes
Includes eccen–
tricity errors
Analog Encoder Interface Circuit
The circuit shown can be used to
convert the current output to a
voltage. Resistor value, R1, and
Capacitor, C, are specified to
attain required gain and low-pass
filtering, which are application
specific. The gain is chosen to
attain maximum output swing
and not clamp the op-amp. VREF
should be set to 1.4 V ± 0.2 V.
A 0.1 µF bypass capacitor
(decoupling capacitor) is recommended to be placed within 1 cm
of the encoder for optimal power
supply noise rejection. Outputs
are high impedance (typical 1
M ohm) and susceptible to EMI.
VREF
+
I+
VA
–
C
IA-IN
R1
VREF
+
I+
VB
–
C
IB-IN
R1
VREF = 1.4 V ± 0.2 V (DC)
Ordering Information
HEDS-971
5
Option
Lead Configurations
Resolutions
Bracket Options
0 – straight leads
1 – bent leads
R – 200 lpi
50
51
Package Dimensions
Option 50
LEAD THICKNESS = 0.25 mm
LEAD PITCH = 2.54 mm
3.8
PIN 1 ID
C
3.9
0.8
2x ∅ 2.00 ± 0.02
1.70 ± 0.15
4.2
10.1
DATE CODE
15.0
3.90 ± 0.10
7.5
12.6 ± 0.5
8.4
PART #
(REFER -05)
7.0
YYWW
4.2
XXXXX
5.0
X
AGILENT
1.4
6.4
0.14
(OPTICAL CENTER)
GND
OPTION CODE
50
5.5 ± 0.3
8.7
3.0
R 2.6
CH A
R 1.4
VCC
CH B
10.8 ± 0.5
0.5
C = COUNTRY
OF ORIGIN
MARKING
(REFER -05
FOR DETAILS)
20.2 ± 0.5
1.8
9.8
Package Dimensions
Option 51
LEAD THICKNESS = 0.25 mm
LEAD PITCH = 2.54 mm
3.8
GND
CH A
3.0
VCC
CH B
10.8 ± 0.5
0.5
OPTION CODE
5.5 ± 0.3
PIN 1 ID
3.9
0.14
(OPTICAL CENTER)
0.8
2x ∅ 2.00 ± 0.02
1.70 ± 0.15
4.2
7.5
YYWW
4.2
C
4.34 ± 0.20
X
AGILENT
6.4
XXXXX
8.7
8.4
PART #
(REFER -05)
3.90 ± 0.10
10.1
9.8
7.0
12.6 ± 0.5
DATE CODE
15.0
20.2 ± 0.5
1.8
51
∅ 2.8
C = COUNTRY
OF ORIGIN
MARKING
(REFER -05
FOR DETAILS)
Package Dimensions
Bent Version – Option 50
LEAD THICKNESS = 0.25 mm
LEAD PITCH = 2.54 mm
6.0
4.2
3.9
0.14
(OPTICAL CENTER)
0.8
2x ∅ 2.00 ± 0.02
1.70 ± 0.15
4.2
10.1
GND
CH A
DATE CODE
15.0
3.90 ± 0.10
7.5
7.0
12.6 ± 0.5
8.4
PART #
(REFER -05)
PIN 1 ID
YYWW
5.0
50
AGILENT
9.2 ± 0.3
6.4
VCC
OPTION CODE
X
1.4
5° TYP.
C
8.7
R 1.4
XXXXX
R 2.6
CH B
3.0 ± 0.3
C = COUNTRY
OF ORIGIN
MARKING
(REFER -05
FOR DETAILS)
20.2 ± 0.5
1.8
9.8
3.8
0.5
10.8 ± 0.5
Package Dimensions
Bent Version – Option 51
LEAD THICKNESS = 0.25 mm
LEAD PITCH = 2.54 mm
6.0
0.8
2x ∅ 2.00 ± 0.02
PART #
(REFER -05)
3.90 ± 0.10
7.5
10.1
9.8
3.8
0.5
10.8 ± 0.5
PIN 1 ID
7.0
12.6 ± 0.5
DATE CODE
15.0
20.2 ± 0.5
1.8
51
GND
8.4
1.70 ± 0.15
4.2
YYWW
3.9
0.14
(OPTICAL CENTER)
C
4.2
4.34 ± 0.20
X
AGILENT
9.2 ± 0.3
6.4
XXXXX
8.7
CH A
OPTION CODE
VCC
5° TYP.
∅ 2.8
CH B
3.0 ± 0.3
C = COUNTRY
OF ORIGIN
MARKING
(REFER -05
FOR DETAILS)
Mounting Considerations
Note: These dimensions include shaft end play and codewheel warp.
All dimensions for mounting the module and codewheel/codestrip should be measured with respect to the two mounting posts, shown
above.
Mounting Tolerances
Case 1 specifies the mounting tolerances required on Rm in order to achieve the respective encoding
characteristics shown on page 4. The mounting tolerances are as follows:
Case 1: Rm ± 0.13 mm (.005 inches)
Recommended Screw Size: M2.5 x 0.45 or 2-56
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For product information and a complete list of
distributors, please go to our web site.
For technical assistance call:
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(408) 654-8675
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Data subject to change.
Copyright © 2002 Agilent Technologies, Inc.
Obsoletes 5988-3614EN
May 10, 2002
5988-6261EN
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