STM32H753 ADC calibration after being disabled for an extended period of time

[TSosi.1]

Hi,

In the STM32H753 reference manual revision 7 ADC section 25.4.8 page 932, there is a statement about ADC calibration:

Anyone know what the extended period is that I should worry about?

Thanks!

[AScha.3]

Hi,

no need to worry. :)

The calibration data will stay there , until you power off the ADC.

BUT...on chip temperature, voltage etc.  will/might change , so after some time, anyway, restart calibration is good idea.

Just think: you have a machine, running 24/7 ; after start (cold chip) calibrate - and then never again, even for years ?

No, if you want best precision, re-calibrate always, lets say: once every hour. (Its just some microseconds..)

Or to know, what will drift or not, in detail, test it :

- run calibrate (with cold chip) at start, then after 2 hours running program, check conversion precision;

then re-calibrate, check conversion precision again, and compare results.

Then you know, should run re-calibration or not needed.