Avago: High Temperature 115°C 1250/2500 CPR 6-Channel Commutation Encoder (AEDT-9340 Series)

Description

The AEDT-9340 optical encoder series are high temperature six channel optical incremental encoder modules. When used with a code wheel, these modules detect rotary position. Each module consists of a lensed LED source and a detector IC enclosed in a small plastic package. Due to a highly collimated light source and a unique photo detector array, these modules are extremely tolerant to mounting misalignment.

The AEDT-9340 encoder has integrated commutation output channels (U,V,W), two-channel quadrature outputs (A,B), plus a third channel index output (I). This ungated index output is a positive index pulse that is generated once for each full rotation of the code wheel.

The AEDT-9340 encoder is designed for use with a code wheel that has an optical radius of 15 mm (0.590 inch) for 1250/2500 CPR, 12.3 mm (0.484 inch) for 1024/2048 CPR and 12mm (0.472 inch) for 1000/2000 CPR.

The quadrature, index, commutation signals and power supplied to encoder are accessed through eight 0.46mm square male connector pins located on 1.27mm pitch.

The AEDT-9340 optical encoder provides advanced motion control detection. The integrated commutation outputs (U,V, and W) is equivalent to those produced by Hall Switches. Thus, this makes to encoder ideal for servo motor applications. Application of the AEDT-9340 solution also enables the system to be more compact, with a significantly reduced alignment time. This is due to the provision of alignment jigs for easier assembly into housed encoders. The encoder also provides superior switching accuracy due to a much lower hysteresis when compared to a Hall Switches. The commutation signals can easily be interchanged for Brushless DC motor of different rotor pole-pairs by simply switching to matching pole-pair code wheels.

Features

Applications

Transmissive Encoders

The Transmissive Encoder is an emitter/detector module. Coupled with a code wheel, this transmissive encoder translates rotary motion of a shaft into digital output. The transmissive encoder contains a single Light Emitting Diode (LED) as its light source. The light is collimated into a parallel beam by means of a single polycarbonate lens located directly over the LED. Opposite the emitter is the integrated detector circuit.

This IC consists of multiple sets of photodetectors and the signal processing circuitry necessary to produce the digital waveforms. The code wheel rotates between the emitter and detector of the transmissive encoder, causing the light beam to be interrupted by the pattern of spaces and bars on the code wheel. The photodiodes which detects these interruptions are arranged in a pattern that corresponds to the radius and design of the code wheel. These detectors are also spaced such that a light period on one pair of detectors corresponds to a dark period on the adjacent pair of detectors. Avago offers an extensive range of transmissive encoders to meet the different needs of a wide variety of applications.

Model No.: AEDT-9340-B00, AEDT-9340-J00, AEDT-9340-U00, AEDT-9340-W00