Hi all!
I have to generate a signal for optionally disabling a circuit subsection. The subsection has two power lines, at 12 V (unregulated) and 3.3 V (regulated), with a common ground. Those lines are also used in other circuit sections, so disabling the regulators is not an option. The signal must be in the 3.3 V logic domain.
The total power requested by the subsection is about 1 W, mostly on the 12 V line.
I was thinking about using an analog switch on the ground line, but I don't know if it is the best option I have. And, moreover, what if digital lines in the low state in the subsection have protection diodes able to conduct current to ground? Maybe I have to block all 3 lines (12 V, 3.3 V and ground)?
Thanks in advance.
Regards,
Stefano