Encoder mode and comparator?

[turboscrew]

Posted on April 08, 2018 at 09:59

In the STM32F030x4/x6/x8/xC and STM32F070x6/xB reference manual (RM0360, ch 13.3.16) it says 'However, comparators are normally be used to convert the encoder�s differential outputs to digital signals. This greatly increases noise immunity.'

What comparators is the manual talking about?

#encoder-mode

[waclawek.jan]

Posted on April 08, 2018 at 10:50

Presumably they are talking about external circuitry designed to absorb/eliminate some of the bouncing inherent in some types of encoders, and/or provide impedance coupling.

Quite a confusing remark in that context, I concur.

JW

[turboscrew]

Posted on April 08, 2018 at 11:49

I kind of suspected that, but I recalled that some chips (like L475) have comparators.

[waclawek.jan]

Posted on April 08, 2018 at 13:16

Of course you can use an on-chip comparator if available, but that provides no additional 'mägic'.

JW