I had used the MAX1240 , this is a A/D conveter with Vcc=3.3 V I put tree 1N4001 diodes to supply and the PIC know that over 3 Volts is ONE , all the other circuits were Vcc=5V -----Mensaje original----- De: William K. Borsum Para: PICLIST@MITVMA.MIT.EDU Fecha: Lunes, 20 de Diciembre de 1999 11:19 a.m. Asunto: Running a pic at 3.3 volts and peripherals at 5 volts >Hi all: > >Has anyone had any experience running a Maxim MAX 186 or similar ADC at 5 >volts while talking to a PIC running at 3.3? > >I'm running into some power issues where I would like to keep the analog >side at 5 volts, but the PIC side and all the memory and logic running at >3.3 volts. > >Anyone done this? And did it work? (without a lot of level shifting) > >Kelly > >William K. Borsum, P.E. -- OEM Dataloggers and Instrumentation Systems > & San Diego, California, USA >