[time-nuts] uC ADC resolution (was: Poor man's oven)
Chris Albertson
albertson.chris at gmail.com
Tue Jun 6 23:43:30 UTC 2017
On Tue, Jun 6, 2017 at 2:17 PM, Attila Kinali <attila at kinali.ch> wrote:
> On Tue, 6 Jun 2017 16:37:27 -0400
> Bob kb8tq <kb8tq at n1k.org> wrote:
>
> . Heck, the STM32F4xx have so much internal noise that the ENOB
> of their ADC is below 6bit... so low that they even had to write an
> appnote on how to do averaging to get back to the 12 bits the ADC is
> spec'ed for. (but don't mention that to an ST sales person, they will
> hate your guts afterwards).
>
Can you actually get back all of those bits? How many samples would you
need? My current use case for the STM32 ADC is to track battery voltage
and maybe 6 bits is enough but if I can get to 12 with a software-only fix
I'll take it. Batteries volts charge slowly so I'd have time to take many
samples. It's a rather mundane application. Controlling a battery
powered motor and I can't let theLiPo battery dichange below a limit so I'm
sampling voltage at 1Hz. Got a link to or the name of the app note?
>
>
--
Chris Albertson
Redondo Beach, California
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