μP_CONTROLLED_NEGATIVE_VOLTAGE_CONVERTER

Published:2009/7/10 1:49:00 Author:May | From:SeekIC

This circuit was used to produce a variable negative voltage for contrast control of an LCD display. A 74F374 generates a square wa:ze that is ac coupled to a rectifter and load. By using the μP clock and data from the processor bus, and properly timed load signal, the dc level generated can be controlled by the μP.



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