MCU and negative output signal

Status
Not open for further replies.
A

andrea.rafg91

Newbie level 1
Joined
Jul 22, 2017
Messages
1
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
12
Hi,

I have a MCU with +3.3V output pins, I will need to power down a device which expects -3.3V signal (it takes no more than 0.5mA current from this signal, it only expectes the negative voltage level).



How could I accomplish this? should I use a P-channel MOSFET, N-Channel? JFET? do you have a recommendation for a +3.3V logic level transistor?

Thank you very much in advance!
Andrea
 

I also would prefer a more simple solution as barry mentioned, anyway if you prefer to make it with discrete components, perhaps something like the following circuit could meet what you need:



Note:
V1 is the output of uC ranging from 0 up to +3.3v, and V2/V3 are -3.3v and +3.3v power supplies. Blue line, control waveform and yellow line, load waveform.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…