The rapid, widespread use of 3.3V logic circuits complicates the selection of RS232 interface circuits. In these systems, an RS232 interface chip which uses the 5V supply for charge pump and driver operation and the 3V supply for receiver output levels, provides the best performance. Systems with only a 3V power supply are unable to use 5V powered RS232 interface circuits. Charge pump triplers (or quadruplers) have losses too great for generating RS232 voltage and current levels from a 3.3V supply. Battery-powered 3V systems can use the RS232 transceiver’s SHUTDOWN and Driver Disable controls to maximize battery charge life.

VPP Supply and RS232 Interface Circuit diagram 

Get more information about Circuit Diagram for 3.3V RS232 Interface System by Gary Maulding in the following article. (source: linear.com)



Related Post

94 Suzuki GSX250F Electrical System and Wiring Diagram
2003 Jeep KJ Electrical Schematic and Wiring Diagram
1986 BMW E28 524TD Electrical Cable Harness Routing Service and Troubleshooting
1964 GMC Truck Electrical System Wiring Diagram
Chevrolet Venture Van Starting System Wiring Diagram