EM2 Transmissive Optical Encoder Module

EM2 Product Description

The EM2 is a transmissive optical encoder module designed to provide up to 4x higher resolution than the EM1. The module detects rotary or linear movement when paired with an encoder disk or linear strip. The EM2 consists of a lensed LED source and a monolithic detector IC enclosed in a small polymer package identical to the EM1. The EM2 uses phased array detector technology allowing for a wider gap tolerance and excellent tolerance to some disk contamination.

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 an encoder disk. The EM2 operates with a single 5V supply and provides single-ended outputs capable of sinking and sourcing 5mA. An internal 0.1 µF 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.