mauricio fernandez montoya

mcf51jm128 5v tolerant inputs

Discussion created by mauricio fernandez montoya on Jul 29, 2011
Latest reply on Jul 29, 2011 by Celso Monteiro


i been working on a design based on mcf51jm128.  i added dual power supply, so the microcontroller can be powered with 5v and 3.3v.  also, there're some peripherals like MicroSD (3.3v), CAN transceiver and RS845 transceiver. (5v). 


i was wondering if JM128 pins are 5v tolerant, so i can use CAN and 485 modules with 3.3v on ucontroller safetly.  

it could be possible to use a series resistor between both devices without burning peripherals or microcontroller?

the schematic is still on process, so there're missing parts and things to change