Charge Pump

by Dan Peirce B.Sc.

Reformated from dokuwiki on July 20, 2013

Table of Contents

Part of the 3.3 Volt LCD

This is from the datasheet of the 3.3 volt LCD datasheet. The capacitors shown are part of a voltage booster (charge pump). See pins 8, 9 and 10 (from )

Tip on MCU Charge Pumps

Could be used to generate RS232 voltages.

By the way Microchip provides a tip of a very simple charge pump circuit to generate a voltage greater than Vdd. A similar circuit could be used to generate a negative voltage. If the existing level shifter does not work with the G-m instrument we could possibly modify it to use voltages generated from PIC charge pump circuits.

( see tip 10 from )