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Dangerous Prototypes

Other projects => Past projects => Breakout boards => Topic started by: grimmjaw on May 15, 2013, 10:03:15 am

Title: ATX breakout board, 5V rail stability
Post by: grimmjaw on May 15, 2013, 10:03:15 am
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
Title: Re: ATX breakout board, 5V rail stability
Post by: ian on July 09, 2013, 06:14:39 am
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.
Title: Re: ATX breakout board, 5V rail stability
Post by: matseng on July 09, 2013, 11:22:03 am
[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.
Title: Re: ATX breakout board, 5V rail stability
Post by: grimmjaw on July 12, 2013, 01:29:25 pm
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
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