AN2350 datasheet(22/41 Pages) STMICROELECTRONICS

Part #	AN2350

Description	Guidelines for the control of a multiaxial planar robot with ST10F276

PDF	41 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Hardware and mechanical equipments

AN2350

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Figure 15.

The conditioning circuit for one absolute encoder

The sector C represents the incremental 12-bit encoder, whose outputs are two sinusoidal

signals (available in orange and green wires) shifted to each other by 90 degrees, with an

offset of 2.5 V and a peak-to-peak voltage of 1.1 V.

Since these signals can not be directly managed by the microcontroller, it has been

necessary to develop a conditioning circuit whose outputs are digital signals.

This conditioning circuit for each sinusoidal signal consists of a comparator whose output is

at a logical high level (5 V) every time the input signal level is over 2.5 V, and at logical low

level (0 V) every time the level of the input signal is below 2.5 V. A detail of the conditioning

circuit for one of the incremental encoders of the wafer handler is shown in the following

figure.

AN2350 Datasheet(PDF) 22 Page - STMicroelectronics