STM32L1 ADC only clocked by HSI ?

[LCE]

Heyho,

just checking the L162 for a new project, then found that the ADC can only be clocked by the HSI.

Is that correct?

If yes, why?

My experience with HSI (and other RC-oscillators) is that it is "mediocre" at best, rather inaccurate and jitters like crazy. Although this might not be a big issue with a 12-bit ADC.

Merci!

[STTwo-32]

Hello @LCE 

I confirm that the ADC is clocked only by HSI. For the reason behind this design choice, according to the chapter 12.3.2 of the RM0038:

"To avoid unnecessary consumption while not converting, the ADC digital interface has been designed to operate in a completely independent manner, at its maximum speed using an internal 16 MHz clock source (HSI), whatever the CPU operating frequency (which can range from a few sub-kHz up to 32 MHz)." 

Best Regards.

STTwo-32

[LCE]

Thanks for the info.

Bad idea anyway. ;)

But probably no game stopper for my application.