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4 votes
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SPI device stops working when integrating Schmitt triggers and ESD diodes

You have the data pins wrong. MOSI is output from MCU and should go to data input DI on the sensor. Also the Schmitt trigger input requires least around 0.7×VCC supply which is around 2.31V (the value ...
Justme's user avatar
  • 157k
3 votes

How to calculate a differential + common mode LPF circuit?

The circuit would be more complicated to analyze if it were not symmetric. But it is symmetric. So that helps simplify a straight-forward analysis, a lot. Here's the schematic with names added. ...
periblepsis's user avatar
1 vote

Why is my encoder showing abnormal spikes on the oscilloscope readings? Any suggestions on what might be causing it?

I would suspect ground connections. I presume the cable between the encoder has "ground" or "common" conductor(s). I would check to see if they are intact and connected at both ...
John Doty's user avatar
  • 4,842
1 vote

SPI device stops working when integrating Schmitt triggers and ESD diodes

LVCMOS logic lines aren't good to terminate, at least not that way. The problem is the output is loaded down too much by the terminator, and the input threshold fails. This is necessarily the case for ...
Tim Williams's user avatar
  • 39.1k

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