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Topic: ATX breakout board, 5V rail stability (Read 5427 times) previous topic - next topic

ATX breakout board, 5V rail stability

Hallo ,

How stabil is the +5V rail of the ATX PSU  to be feed into uC in regards of taking ADC measurement.
Since i will be using internal Vref for ADC measurement.

p/s:Has anyone tried to use the breakout board for stepper motor?

Grimmjaw

Re: ATX breakout board, 5V rail stability

Reply #1
For maximum stability I would use the +12 and a 5volt linear regulator. I imagine the +5 of most PSUs is pretty clean, enough for a PC, but it needs a good load to be super stable.
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Re: ATX breakout board, 5V rail stability

Reply #2
[quote author="grimmjaw"]Hallo ,

How stabil is the +5V rail of the ATX PSU  to be feed into uC in regards of taking ADC measurement.
Since i will be using internal Vref for ADC measurement.
[/quote]

If you're using the internal vref as the reference for the ADC the stability of the vcc shouldn't matter. The vref is by definition a stable reference and is not particulary affcted by variations of the vcc.

Re: ATX breakout board, 5V rail stability

Reply #3
Since this is an old thread i have solved my problem. I used the method mentionend by ian, using the 12V rail and scale it down to 5v