ID4501L Dual Channel Linear Encoder Kit
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ID4501L Dual Channel Linear Encoder Kit A and B in quadrature down to 0.02 um up to 32 m/s up to 0.6 mm 5 V, 10 mA -20 to 100°C Description The ID4501L incremental encoder kit consists of an encoder and a linear scale (Fig. 1). The encoder is an integrated circuit in a PCB housing in SMD-format. It provides incremental A and B output signals in quadrature (Fig. 2). The linear scale is a PCB with passive copper strips. The orientation of the encoder is selected in Table 1. Resolution, maximum speed and airgap The resolution and the maximum speed of the encoder are user-programmable or can be programmed ex-factory. The resolution depends on a filter setting that limits the maximum speed of the encoder vs. the scale. The resolution also depends on the maximum distance between the encoder and the scale. The resolution and maximum speed for a certain maximum air-gap are selected in Tables 2 and 3. Scales Scales with different dimensions and period lengths are available (Fig. 4) and are selected in Table 5. The scale may be mounted on any substrate, using an edge for accurate positioning in front of the encoder. Encoder assembly The encoder can be assembled by reflow soldering on a rigid or flexible PCB. Optimum performances are obtained by following the recommended schematic (Fig. 5) and footprint (Fig. 6). In particular, there should be no copper traces or metal objects behind the encoder up to a distance of 3 mm in order to avoid any influence on the measured position. If this is not possible, a blank copper layer behind the encoder (rear-side of the PCB) may be envisaged and/or a linearization using the on-chip look-up table (LUT). Encoder holder The encoder holder type A is available (Fig. 7) and can be selected in Table 6. It includes the encoder and the external components according to the recommended schematic (Fig. 5). The encoder holder can be mounted on any substrate using 4 screw holes. Encoder cable and connector The encoder on holder can be supplied with a flat cable of pitch 1.27 mm and a connector (Fig. 7). The cable length and the connector type are selected in Tables 7 and 8. Encoder programming The Evaluation and Programming Tool (EPT) including an interface board and the ASSIST software is available for the linearization and programming of the encoder. 3D models of encoder, holder and scales STEP models are available on www.posic.com.

Recommended Operating Conditions Linearity For high-resolution high-precision applications, it is possible to linearize the encoder by means of a Look-Up Table (LUT) that is located inside the encoder. The LUT can be programmed in volatile or in non-volatile memory by means of the Evaluation and Programming Tool (EPT) or it can be pre-programmed by POSIC. The LUT option is selected in Table 4. 0 = Phase P = Pulse width Definitions Airgap Cycle CPP °e Phase shift O Pulse width P State width S Fig. 2 Encoder output signals A and B in quadrature. Distance between encoder and scale in...

BB Maximum speed Table 2 D Look-Up Table Table 4 EEEEE Linear scale Table 5 F Encoder holder Table 6 Table 1: Orientation. Arrows indicate direction of move ment of the scale with rising edge A prior to B. Table 2: Maximum speed * Recommended airgap = 0.2 mm. Sequence of A and B transitions is correct up to Maximum Airgap, but encoding specifications may be out of range. Lower Max speed leads to lower jitter of the A/B outputs. Table 4: . Look-Up Table (LUT) © Copyright 2017 POSIC. All rights reserved. No part of this document may be reproduced without the prior written consent of POSIC....