Re: Protecting I/Os + current sensing
- Here is a schematic of a possible protection circuit.
Now do you see where the 1V drop comes from? If the
I/O pin on the processor is at 5V and 15mA flows
through the series resistor, What is the voltage on
the other side of the resistor?
--- In Electronics_101@yahoogroups.com, "Kelvin Lau
<kelau@h...>" <kelau@h...> wrote:
> I'm using a Microchip PIC16F874. Which can source25mA per I/O, but
> have a max. of 200mA sourcing capacity for the wholechip. I don't
> quite understand your explanation regarding the max.resistance I can
> have is 68ohm. what's the 1V drop coming from?__________________________________________________
Do you Yahoo!?
Yahoo! Mail Plus - Powerful. Affordable. Sign up now.