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Transmissive Optical Encoder ModulePage 1 of 7 Features ► Two channel quadrature with index ► High resolution version of EM1 ► Single 5V supply ► Rotary versions up to 10000 CPR ► Linear versions up to 2000 CPI ► Internal decoupling capacitor ► Outputs source/sink 5 mA The EM2 is a transmissive optical encoder module designed to offer 2x or 4x higher resolution than the EM1 encoder module. This module is designed to detect rotary position when used with a US Digital encoder disk. The EM2 consists of a lensed LED source and a monolithic detector IC enclosed in a small polymer package that is identical to the EM1. The EM2 uses phased array detector technology to provide superior performance and greater tolerances over traditional aperture mask type encoders. The EM2 provides digital A & B quadrature outputs with a third output index channel. Each EM2 module is resolution specific and is matched to the resolution of a encoder disk. The EM2 operates with a single 5V supply and provides single ended outputs which are capable of both sinking and sourcing 5mA. An internal 0.1 uF decoupling capacitor is designed into the EM2 to provide enhanced noise immunity. 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, quadrature decoder chips, counter chips, computer interface boards, mating connectors and cables are also available. Download the EM2/EM1 comparison chart. DIGITAL Vancouver, Washington 98684, USA www.usdigital.com Toll-free: 800.736.0194
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Transmissive Optical Encoder ModulePage 2 of 7 RoHS COMPLIANT Mechanical DrawingEM2 Transmissive Optical Encoder Moduleus .110[2.79] I IS*— 1400 NE 136th Avenue Dl GITAL Vancouver, Washington 98684, USA info@usdigital.com www.usdigital.com UNITS: INCHES [MM] METRIC SHOWN FOR REFERENCE ■ Linear AlignmentEM2 Transmissive Optical Encoder ModuleLinear Strip Alignment -TEXT RIGHT READING FROM DETECTOR SIDE DETECTOR SIDE OF MODULE- ^—INDEX TRACK --QUADRATURE TRACK _.330[8.38] CENTER OF TRACKS -.406[ 10.31 ] -.518[13.15] .188+010[4.77±0.25] •MOUNTING HOLES TO CENTER OF TRACKS US1 UbS= 1400 ME...
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Transmissive Optical Encoder Module Page 3 of 7 EM2 Disk Alignment EM2 Transmissive Optical Encoder Module Disk Alignment DIGITAL Vancouver, Washington 98684, USA www.usdigital.com Toll-free: 800.736.0194
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Transmissive Optical Encoder Module Page 4 of 7 DIGITAL Vancouver, Washington 98684, USA www.usdigital.com Toll-free: 800.736.0194
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Transmissive Optical Encoder ModulePage 5 of 7 Parameter Min. Typ. Max. Units Conditions Output Current Per Channel ^ Timing Characteristics Encoding Characteristics: ► Specifications apply over entire operating temperature/voltage range. ► Values are for the worst error over full rotation. ► Refer to timing diagram below. Parameter Symbol Min. Typ. Max. Units Timing Diagram: cpi: The number of Cycles (C) of the A or B output Per Inch of linear strip movement. 1400 NE 136th Avenue Vancouver, Washington 98684, USA info@usdigital.com www.usdigital.com
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RoHS COMPLIANT CPR: The number of Cycles (C) of the A or B outputs Per 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 c ycle (90 6). One Shaft Rotation: 360 mechanical degrees. One Electrical Degree ( ° e): 1 /360th of one cycle. One Cycle: 360 electrical degrees ( 0e). Each cycle can be decoded into 1 or 4 states, referred to as XI orX4 resolution multiplication. PPR: The number of resolvable Positions Per Revolution of the encoder disk with x4 quadrature decoding. O Quadrature (Z): The...
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Transmissive Optical Encoder ModulePage 7 of 7 Native OD Native CPI/CPR Index Notes ► US Digital® warrants its products against d efects in materials and workmanship for two years. See complete warranty for details. DIGITAL Vancouver, Washington 98684, USA www.usdigital.com Toll-free: 800.736.0194
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