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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1064 of 1441
NXP Semiconductors
UM10503
Chapter 34: LPC43xx/LPC43Sxx Quadrature Encoder Interface (QEI)
34.4 Introduction
A quadrature encoder, also known as a 2-channel incremental encoder, converts angular
displacement into two pulse signals. By monitoring both the number of pulses and the
relative phase of the two signals, you can track the position, direction of rotation, and
velocity. In addition, a third channel, or index signal, can be used to reset the position
counter. This quadrature encoder interface module decodes the digital pulses from a
quadrature encoder wheel to integrate position over time and determine direction of
rotation. In addition, it can capture the velocity of the encoder wheel.