EM1 Transmissive Optical Encoder Module

Photos (4)
Mechanical Drawings (3)

EM1 Features

Two-channel quadrature with optional index
Improved replacement for HEDS-9000 Series
Single 5 VDC supply
Resolutions from 32 to 2,500 CPR
Internal decoupling capacitor
Sink/source 8mA outputs

See more info below

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EM1 Product Description

The EM1 is a transmissive optical encoder module designed to detect rotary or linear position when paired together with an encoder disk 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 an encoder disk or linear strip. The EM1 module now supports all standard resolutions offered by the HEDS-9000 series encoder module and additional resolutions. The EM1 operates with a single 5V supply and provides single-ended outputs capable of sinking and sourcing 8mA. An internal 0.1 µF 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.

Product Specifications

COMPATIBLE 1" & 2" DISKS

CPR	MODULE Non-Index	1" DISK Non-Index	MODULE Index	1" DISK Index
	1" DISKS
32	EM1-1-32-N	DISK-1-32-*-NE
50	EM1-1-50-N	DISK-1-50-*-NE	EM1-1-50-I	DISK-1-50-*-IE
96	EM1-1-100-N	DISK-1-96-*-NE	EM1-1-100-I	DISK-1-96-*-IE
100	EM1-1-100-N	DISK-1-100-*-NE	EM1-1-100-I	DISK-1-100-*-IE
120	EM1-1-100-N	DISK-1-120-*-NE
192	EM1-1-200-N	DISK-1-192-*-NE	EM1-1-200-I	DISK-1-192-*-IE
200	EM1-1-200-N	DISK-1-200-*-NE	EM1-1-200-I	DISK-1-200-*-IE
250	EM1-1-250-N	DISK-1-250-*-NE	EM1-1-250-I	DISK-1-250-*-IE
256	EM1-1-250-N	DISK-1-256-*-NE	EM1-1-250-I	DISK-1-256-*-IE
360	EM1-1-360-N	DISK-1-360-*-NE	EM1-1-360-I	DISK-1-360-*-IE
400	EM1-1-400-N	DISK-1-400-*-NE	EM1-1-400-I	DISK-1-400-*-IE
500	EM1-1-500-N	DISK-1-500-*-NE	EM1-1-500-I	DISK-1-500-*-IE
512	EM1-1-512-N	DISK-1-512-*-NE	EM1-1-512-I	DISK-1-512-*-IE
540	EM1-1-540-N	DISK-1-540-*-NE	EM1-1-540-I	DISK-1-540-*-IE
720	EM1-1-720-N	DISK-1-720-*-NE	EM1-1-720-I	DISK-1-720-*-IE
800	EM1-1-800-N	DISK-1-800-*-NE	EM1-1-800-I	DISK-1-800-*-IE
900	EM1-1-900-N	DISK-1-900-*-NE	EM1-1-900-I	DISK-1-900-*-IE
1000	EM1-1-1000-N	DISK-1-1000-*-NE	EM1-1-1000-I	DISK-1-1000-*-IE
1024	EM1-1-1024-N	DISK-1-1024-*-NE	EM1-1-1024-I	DISK-1-1024-*-IE
1250	EM1-1-1250-N	DISK-1-1250-*-NE	EM1-1-1250-I	DISK-1-1250-*-IE
	*Represents the bore size
	2" DISKS
CPR	MODULE Non-Index	2" DISK Non-Index	MODULE Index	2" DISK Index
64	EM1-1-32-N	DISK-2-64-*-NE
100	EM1-1-50-N	DISK-2-100-*-NE	EM1-1-50-I	DISK-2-100-*-IE
200	EM1-1-100-N	DISK-2-200-*-NE	EM1-1-100-I	DISK-2-200-*-IE
400	EM1-1-200-N	DISK-2-400-*-NE	EM1-1-200-I	DISK-2-400-*-IE
500	EM1-2-500-N	DISK-2-500-*-NE	EM1-2-500-I	DISK-2-500-*-IE
512	EM1-2-500-N	DISK-2-512-*-NE	EM1-2-500-I	DISK-2-512-*-IE
800	EM1-1-400-N	DISK-2-800-*-NE	EM1-1-400-I	DISK-2-800-*-IE
1000	EM1-2-1000-N	DISK-2-1000-*-NE	EM1-2-1000-I	DISK-2-1000-*-IE
1024	EM1-2-1024-N	DISK-2-1024-*-NE	EM1-2-1024-I	DISK-2-1024-*-IE
1800	EM1-2-1800-N	DISK-2-1800-*-NE	EM1-2-1800-I	DISK-2-1800-*-IE
2000	EM1-2-2000-N	DISK-2-2000-*-NE	EM1-2-2000-I	DISK-2-2000-*-IE
2048	EM1-2-2048-N	DISK-2-2048-*-NE	EM1-2-2048-I	DISK-2-2048-*-IE
2500	EM1-2-2500-N	DISK-2-2500-*-NE	EM1-2-2500-I	DISK-2-2500-*-IE
	*Represents the bore size

COMPATIBLE 1" & 2" HUBDISKS

CPR	MODULE Non-Index	1" HUBDISK Non-Index	MODULE Index	1" HUBDISK Index
	1" HUBDISKS
32	EM1-1-32-N	HUBDISK-1-32-*-NE
50	EM1-1-50-N	HUBDISK-1-50-*-NE	EM1-1-50-I	HUBDISK-1-50-*-IE
96	EM1-1-100-N	HUBDISK-1-96-*-NE	EM1-1-100-I	HUBDISK-1-96-*-IE
100	EM1-1-100-N	HUBDISK-1-100-*-NE	EM1-1-100-I	HUBDISK-1-100-*-IE
120	EM1-1-100-N	HUBDISK-1-120-*-NE
192	EM1-1-200-N	HUBDISK-1-192-*-NE	EM1-1-200-I	HUBDISK-1-192-*-IE
200	EM1-1-200-N	HUBDISK-1-200-*-NE	EM1-1-200-I	HUBDISK-1-200-*-IE
250	EM1-1-250-N	HUBDISK-1-250-*-NE	EM1-1-250-I	HUBDISK-1-250-*-IE
256	EM1-1-250-N	HUBDISK-1-256-*-NE	EM1-1-250-I	HUBDISK-1-256-*-IE
360	EM1-1-360-N	HUBDISK-1-360-*-NE	EM1-1-360-I	HUBDISK-1-360-*-IE
400	EM1-1-400-N	HUBDISK-1-400-*-NE	EM1-1-400-I	HUBDISK-1-400-*-IE
500	EM1-1-500-N	HUBDISK-1-500-*-NE	EM1-1-500-I	HUBDISK-1-500-*-IE
512	EM1-1-512-N	HUBDISK-1-512-*-NE	EM1-1-512-I	HUBDISK-1-512-*-IE
540	EM1-1-540-N	HUBDISK-1-540-*-NE	EM1-1-540-I	HUBDISK-1-540-*-IE
720	EM1-1-720-N	HUBDISK-1-720-*-NE	EM1-1-720-I	HUBDISK-1-720-*-IE
800	EM1-1-800-N	HUBDISK-1-800-*-NE	EM1-1-800-I	HUBDISK-1-800-*-IE
900	EM1-1-900-N	HUBDISK-1-900-*-NE	EM1-1-900-I	HUBDISK-1-900-*-IE
1000	EM1-1-1000-N	HUBDISK-1-1000-*-NE	EM1-1-1000-I	HUBDISK-1-1000-*-IE
1024	EM1-1-1024-N	HUBDISK-1-1024-*-NE	EM1-1-1024-I	HUBDISK-1-1024-*-IE
1250	EM1-1-1250-N	HUBDISK-1-1250-*-NE	EM1-1-1250-I	HUBDISK-1-1250-*-IE
	*Represents the bore size
	2" HUBDISKS
CPR	MODULE Non-Index	2" HUBDISK Non-Index	MODULE Index	2" HUBDISK Index
64	EM1-1-32-N	HUBDISK-2-64-*-NE
100	EM1-1-50-N	HUBDISK-2-100-*-NE	EM1-1-50-I	HUBDISK-2-100-*-IE
200	EM1-1-100-N	HUBDISK-2-200-*-NE	EM1-1-100-I	HUBDISK-2-200-*-IE
400	EM1-1-200-N	HUBDISK-2-400-*-NE	EM1-1-200-I	HUBDISK-2-400-*-IE
500	EM1-2-500-N	HUBDISK-2-500-*-NE	EM1-2-500-I	HUBDISK-2-500-*-IE
512	EM1-2-500-N	HUBDISK-2-512-*-NE	EM1-2-500-I	HUBDISK-2-512-*-IE
800	EM1-1-400-N	HUBDISK-2-800-*-NE	EM1-1-400-I	HUBDISK-2-800-*-IE
1000	EM1-2-1000-N	HUBDISK-2-1000-*-NE	EM1-2-1000-I	HUBDISK-2-1000-*-IE
1024	EM1-2-1024-N	HUBDISK-2-1024-*-NE	EM1-2-1024-I	HUBDISK-2-1024-*-IE
1800	EM1-2-1800-N	HUBDISK-2-1800-*-NE	EM1-2-1800-I	HUBDISK-2-1800-*-IE
2000	EM1-2-2000-N	HUBDISK-2-2000-*-NE	EM1-2-2000-I	HUBDISK-2-2000-*-IE
2048	EM1-2-2048-N	HUBDISK-2-2048-*-NE	EM1-2-2048-I	HUBDISK-2-2048-*-IE
2500	EM1-2-2500-N	HUBDISK-2-2500-*-NE	EM1-2-2500-I	HUBDISK-2-2500-*-IE
	*Represents the bore size

COMPATIBLE LINEAR STRIPS

LPI	MODULE Non-Index	Linear Strip Non-Index	MODULE Index	Linear Strip Index
120	EM1-0-120-N	LIN-120-*-N	EM1-0-120-I	LIN-120-*-#
127	EM1-0-127-N	LIN-127-*-N	EM1-0-127-I	LIN-127-*-#
150	EM1-0-150-N	LIN-150-*-N	EM1-0-150-I	LIN-150-*-#
180	EM1-0-180-N	LIN-180-*-N	EM1-0-180-I	LIN-180-*-#
200	EM1-0-200-N	LIN-200-*-N	EM1-0-200-I	LIN-200-*-#
250	EM1-0-250-N	LIN-250-*-N	EM1-0-250-I	LIN-250-*-#
300	EM1-0-300-N	LIN-300-*-N	EM1-0-300-I	LIN-300-*-#
360	EM1-0-360-N	LIN-360-*-N	EM1-0-360-I	LIN-360-*-#
500	EM1-0-500-N	LIN-500-*-N	EM1-0-500-I	LIN-500-*-#
	* Represents length of Linear Strip		* Represents length of Linear Strip # Represents location of Index

ENVIRONMENTAL

Parameter	Value	Units
Operating Temperature	-40 to 100	C
Electrostatic Discharge, IEC 61000-4-2	± 4	kV
Vibration (10Hz to 2kHz, sinusoidal)	20	G
Shock (6 milliseconds, half-sine)	75	G

OPERATING CONDITIONS

PARAMETER	MIN.	MAX.	UNITS
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.
Disk/Linear Strip Radial Position Tolerance	±.005		inch

ELECTRICAL SPECIFICATIONS

Specifications apply over the entire operating temperature range.
Typical values are specified at Vcc = 5.0V and 25C.

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
Supply Current, EM1-0- (linear strip)		54	65	mA	LPI ≥ 300, no load
Supply Current, EM1-1- (1" disk)		27	33	mA	CPR < 500, no load
Supply Current, EM1-1- (1" disk)		54	65	mA	CPR ≥ 500, no load
Supply Current, EM1-2- (2" disk)		27	33	mA	CPR < 1000, no load
Supply Current, EM1-2- (2" disk)		54	65	mA	CPR ≥ 1000, no load
Low-level Output			0.5	V	I_OL = 8mA max.
Low-level Output		0.05		V	No load
High-level Output	2.0			V	I_OH = -8mA max.
High-level Output		4.8		V	No load
Output Current Per Channel	-8		8	mA
Load Capacitance			100	pF
Output Rise Time		110		nS
Output Fall Time		100		nS

TIMING CHARACTERISTICS

ENCODING CHARACTERISTICS:

Specifications apply over the entire operating temperature range.
Values are for the worst error over full rotation.
Refer to the timing diagram below.

PARAMETER	SYMBOL	MIN.	TYP.	MAX.	UNITS
Symmetry	X, Y	150	180	210	°e
Quadrature	Z	60	90	120	°e
Index Pulse Width	Po	40	90	120	°e
Ch. I Rise After Ch. B or Ch. A Fall	t1	50	100	200	ns
Ch. I Fall After Ch. B or Ch. A Rise	t2	-10	15	25	ns

TIMING DIAGRAM:

CPR: The number of Cycles (C) of the A or B outputs Per Revolution.

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.

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).

LPI: Lines Per Inch. The number of Cycles (C) of the A or B output per inch of linear strip movement.

One Shaft Rotation: 360 mechanical degrees.

One Electrical Degree (°e): 1/360th of one cycle.

One Cycle (C): 360 electrical degrees (°e). Each cycle can be decoded into 1 or 4 states, referred to as X1 or X4 resolution multiplication.

PPR: The number of resolvable Positions Per Revolution of the encoder disk with x4 quadrature decoding.

Quadrature (Z): The phase lag or lead between channels A and B in electrical degrees, nominally 90 °e.

Symmetry: A measure of the relationship between (X) and (Y) in electrical degrees, nominally 180°e.

INSTALLATION TORQUE

PARAMETER	TORQUE
Mounting Screws	3.5-4 in-lbs

EM1 / HEDS COMPARISON

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. The EM1 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 resolutions.

PIN-OUTS

Pin	Description
1	Ground
2	Index
3	A channel
4	+5VDC power
5	B channel

PRODUCT CHANGE NOTIFICATIONS

Title	Date	Description	Download
EM1 LED Die - PCN 1016	2/7/2013	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: 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.	Download
EM1 & EM2 Update - PCN 4199	1/14/2014	Based on our continuous process improvement program, US Digital is changing the current marking method for our EM1 and EM2 encoder modules to a serialization method. This change will allow for each module to have a unique code; the current marking method is based on a date code system that includes all encoder modules produced within a specific week / year. The serialization system will be based on a hexadecimal system.	Download

Additional Information

Product Notes

US Digital® warrants its products against defects in materials and workmanship for two years. See complete warranty for details.

Datasheets

EM1_WEB-Datasheet.pdf

Press Releases

800 CPR Resolution Option Added to EM1 Module

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