US Digital E8P OEM Optical Kit Encoder (Rotary)

The E8P optical incremental kit encoder is designed for high volume, low cost, mid-resolution OEM motion control applications. The E8P is small enough for a NEMA Size 11 stepper motor.The E8P uses a single 5V supply and offers two TTL quadrature outputs. Single-ended or differential output options are available. A single chip reflective encoder module incorporates an LED, monolithic detector and molded lenses. The phased array technology accepts far wider mechanical tolerance and misalignment than traditional aperture type encoders. The E8P uses an innovative, patent pending, push-on code wheel that provides extremely secure and accurate, yet easy installation without setscrews.

The E8P provides mounting holes for two #4-40, length .250" screws or two M2.5x.45mm, length 6mm screws on a 0.75" diameter bolt circle. When mounting holes are not available, an option with a transfer adhesive pre-applied to the base is available. A centering tool is provided to center the base to the motor shaft during installation. The code wheel pushes on by hand using a spacer tool to set the gap in one step. The cover snaps on to complete the assembly in seconds.

The single-ended output version has a 4-pin high retention polarized connector and is designed to drive cables up to six feet long. For longer cable lengths, the differential output version (6-pin connector) is recommended to maximize noise immunity. The internal 26C31 differential line driver can source and sink 20 mA at TTL levels. The recommended receiver is industry standard 26C32. Maximum noise immunity is achieved when the differential receiver is terminated with a 150 Ω resistor in series with a .0047 μF capacitor placed across each differential pair. The capacitor simply conserves power. Otherwise power consumption would increase by approximately 20 mA per pair, or 40 mA for 2 pairs.

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