datasheet for EM1 by US Digital

datasheet for EM1 by US Digital
EM1
Transmissive Optical Encoder Module
Page 1 of 9
Description
The EM1 is a transmissive optical encoder module designed to be an improved
replacement for the HEDS-9000 series encoder module. This module is
designed to detect rotary or linear position when used together with a code
wheel or linear strip. The EM1 consists of a lensed LED source and a monolithic
detector IC enclosed in a small polymer package. The EM1 uses phased array
detector technology to provide superior performance and greater tolerances over
traditional aperture mask type encoders.
The EM1 provides digital A & B quadrature outputs with an optional third output
index channel. Each EM1 module is resolution specific and is matched to the
resolution of a code wheel or linear strip. All standard resolutions offered by the
HEDS-9000 series encoder module, as well as additional resolutions, are now
supported by the EM1 module. The EM1 operates with a single 5V supply and
provides single ended outputs which are capable of both sinking and sourcing
8mA. An internal 0.1 uF decoupling capacitor is designed into the EM1 to provide
enhanced noise immunity over the HEDS-9000 series encoder modules.
For open collector and higher voltage applications, add the PC3 cable driver, or
for differential cable driver outputs, add the PC4 cable driver. Encoder disks,
linear strips, quadrature decoder chips, counter chips, computer interface
boards, mating connectors and cables are also available.
Features
Two channel quadrature with optional index
Improved replacement for HEDS-9000 Series
Single 5 VDC supply
Resolutions from 32 to 2500 CPR
Internal decoupling capacitor
Sink/source 8mA outputs
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EM1
Transmissive Optical Encoder Module
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Linear Strip Alignment
Disk Alignment
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Transmissive Optical Encoder Module
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Mechanical Drawing
Available Resolutions
CPR
/LPI
1" Disk Nonindex
32
EM1-1-32-N
50
EM1-1-50-N
1" Disk
Index
2" Disk Nonindex
2" Disk
Index
Linear Strip Nonindex
Linear Strip
Index
120
EM1-0-120-N
EM1-0-120-I
125
EM1-0-127-N
EM1-0-127-I
127
EM1-0-127-N
EM1-0-127-I
150
EM1-0-150-N
EM1-0-150-I
180
EM1-0-180-N
EM1-0-180-I
EM1-1-50-I
64
EM1-1-32-N
96
EM1-1-100-N
EM1-1-100-I
100
EM1-1-100-N
EM1-1-100-I
EM1-1-50-N
EM1-1-50-I
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EM1
Transmissive Optical Encoder Module
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CPR
/LPI
1" Disk Nonindex
1" Disk
Index
192
EM1-1-200-N
EM1-1-200-I
200
EM1-1-200-N
EM1-1-200-I
250
EM1-1-250-N
EM1-1-250-I
256
EM1-1-250-N
EM1-1-250-I
2" Disk Nonindex
2" Disk
Index
Linear Strip Nonindex
Linear Strip
Index
EM1-1-100-N
EM1-1-100-I
EM1-0-200-N
EM1-0-200-I
EM1-0-250-N
EM1-0-250-I
EM1-0-300-N
EM1-0-300-I
EM1-0-360-N
EM1-0-360-I
EM1-0-500-N
EM1-0-500-I
300
360
EM1-1-360-N
EM1-1-360-I
400
EM1-1-400-N
EM1-1-400-I
EM1-1-200-N
EM1-1-200-I
500
EM1-1-500-N
EM1-1-500-I
EM1-2-500-N
EM1-2-500-I
512
EM1-1-512-N
EM1-1-512-I
EM1-2-500-N
EM1-2-500-I
720
EM1-1-720-N
EM1-1-720-I
900
EM1-1-900-N
EM1-1-900-I
1000
EM1-1-1000-N
EM1-1-1000-I
EM1-2-1000-N
EM1-2-1000-I
1024
EM1-1-1024-N
EM1-1-1024-I
EM1-2-1024-N
EM1-2-1024-I
1250
EM1-1-1250-N
EM1-1-1250-I
1800
EM1-2-1800-N
EM1-2-1800-I
2000
EM1-2-2000-N
EM1-2-2000-I
2048
EM1-2-2048-N
EM1-2-2048-I
2500
EM1-2-2500-N
EM1-2-2500-I
For more information, see the EM1/HEDS Compatibility Guide.
Operating Conditions
Parameter
Min.
Max.
Units
Temperature
-55
125
C
A/B Output Frequency
0
300
kHz
Disk RPM
0
(18 x 10^6) / CPR
RPM
Linear Strip Speed
0
(3 x 10^5) / LPI
inches/sec.
Notes
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EM1
Transmissive Optical Encoder Module
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Parameter
Min.
Disk Radial Position Tolerance
± .005
Max.
Units
Notes
inch
with gap set by standard spacer tool
Electrical Specifications
Specifications apply over entire operating temperature range.
Typical values are specified at Vcc = 5.0Vdc and 25
C.
Parameter
Min.
Typ.
Max.
Units
Conditions
Supply Voltage
4.5
5.0
5.5
V
Ripple < 100 mVpp
Supply Current, EM1-0- (linear strip)
-
27
33
mA
LPI < 300, no load
-
50
62
mA
LPI
-
27
33
mA
CPR < 500, no load
-
50
62
mA
CPR
-
27
33
mA
CPR < 1000, no load
-
50
62
mA
CPR
Low-level Output
-
-
0.5
V
IOL = 8mA max.
High-level Output
2.0
-
-
V
IOH = -8mA max.
4.2
4.8
-
V
Unloaded
-8
-
8
mA
100
pF
Supply Current, EM1-1- (1" disk)
Supply Current, EM1-2- (2" disk)
Output Current Per Channel
Load Capacitance
Output Rise Time
110
nS
Output Fall Time
100
nS
Electrostatic Discharge
±4
kV
300, no load
500, no load
1000, no load
Human Body Model
Timing Characteristics
Encoding Characteristics:
Specifications apply over entire operating temperature range.
Values are for the worst error over full rotation.
Refer to timing diagram below.
Parameter
Symbol
Min.
Typ.
Max.
Units
Cycle Error
C
-
3.0
5.5
e
Symmetry
X, Y
150
180
210
e
Quadrature
Z
60
90
120
e
Index Pulse Width
Po
60
90
120
e
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Transmissive Optical Encoder Module
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Parameter
Symbol
Min.
Typ.
Max.
Units
Ch. I Rise After Ch. B or Ch. A Fall
t1
10
100
250
ns
Ch. I Fall After Ch. B or Ch. A Rise
t2
70
150
300
ns
Timing Diagram:
CPR: The number of Cycles (C) of the A or B outputs Per Revolution.
One Shaft Rotation: 360 mechanical degrees.
One Electrical Degree (
e): 1/360th of one cycle.
One Cycle (C): 360 electrical degrees (
multiplication.
e). Each cycle can be decoded into 1 or 4 states, referred to as X1 or X4 resolution
Cycle Error: 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/CPR of a revolution.
Symmetry: A measure of the relationship between (X) and (Y) in electrical degrees, nominally 180
Quadrature (Z): The phase lag or lead between channels A and B in electrical degrees, nominally 90
e.
e.
Index (I): The index output goes high once per revolution, coincident with the low states of channels A and B, nominally 1/4 of one
cycle (90
e).
Position Error: The difference between the actual shaft position and the position indicated by the encoder cycle count.
Installation Torque
Parameter
Torque
Mounting Screws
3.5-4 in-lbs
EM1 / HEDS Comparison
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EM1
Transmissive Optical Encoder Module
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US Digital is the designer and manufacturer of the EM1 transmissive optical encoder module. The design of the EM1 provides
electrical and mechanical compatibility with HEDS-9000, HEDS-9100, HEDS-9200, HEDS-9040, and HEDS-9140 series modules.
The process of switching from the HEDS to the EM1 module should not require any mechanical or electrical changes. Simply use the
EM1 and matching codewheel in place of the HEDS module and codewheel. The EM1 has a built-in index channel available on most
resolutions, for both rotary disks and linear strips. The EM1 uses a US Digital designed codewheel with 2 tracks rather than 3 tracks for
index versions. TheEM1 offers improved output drive capability and will source and sink 8mA at TTL levels.
Physically, the EM1 has no external wire loops which can interfere when mounting. The connector pins are 0.051" shorter than HEDS
modules, while still providing .30" insertion depth. US Digital's EM1 offers custom and special resolutions.
Product Change Notifications
Title
Date
EM1 LED Die PCN 1016
2/7/2013
Description
Download
As part of US Digital's continual assurance of supply strategy, we have qualified
additional sources for our LED die used in our EM1 encoder module, which in turn
impacts all of the following products:
Download
EM1, E2, E3, E5, E6, H1, H15, H3, H5, H6, HB5M, HB6M, HD25, PE, S1, S2, S5, S6,
T5 and T6
The device specification will remain the same, i.e. there will be no change to form, fit or
function of the product(s) as specified by US Digital. The appropriate quality and
reliability testing has been performed on representative products to ensure normal
parametric distribution, consistent with US Digital's quality and reliability standards.
EM1 Component
Change Notice
N/A
Unless otherwise specified, the US Digital EM1 optical encoder module will be phased
in to replace our previous encoder module, HEDS-9000 Series, supplied by Avago
Technologies.
View
Pin-outs
Pin
Description
1
Ground
2
Index
3
A channel
4
+5VDC power
5
B channel
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Transmissive Optical Encoder Module
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Ordering Information
EM1 -
-
-
Native OD
Native LPI/CPR
Index
0Linear
32 =
I =Index
1 =1in
50 =
N =No Index
2 =2in
100 =
120 =
127 =
150 =
180 =
200 =
250 =
300 =
360 =
400 =
Rules
Native OD must be equal to 1 when Native
LPI/CPR is equal to 32, 50, 100, 400, 720, 900,
1250 or 512
Native OD must be equal to 0 when Native
LPI/CPR is equal to 120, 150, 300, 127 or 180
Native OD must be equal to 2 when Native
LPI/CPR is equal to 2048, 2500, 1800 or 2000
Native OD must be something other than 2
when Native LPI/CPR is equal to 200, 360 or
250
Native OD must be something other than 0
when Native LPI/CPR is equal to 1000 or 1024
Index must be something other than I when
Native LPI/CPR is equal to 32
500 =
512 =
720 =
900 =
1000 =
Notes
US Digital warrants its products against defects
in materials and workmanship for two years.
See complete warranty for details.
1024 =
1250 =
1800 =
2000 =
2048 =
2500 =
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EM1
Transmissive Optical Encoder Module
Page 9 of 9
Base Pricing
Quantity
Price
1
$46.82
5
$32.31
10
$28.77
50
$24.54
For volume discounts, please contact us at [email protected] or 800.736.0194.
Rev. 130819112922
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