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Siglent STB3 Demo board - Noisy Sine Wave..
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tautech:

--- Quote from: TheDefpom on September 03, 2024, 08:38:35 am ---You give me too much credit Rob, it is an Altera MAX 10 FPGA, not something I have any knowledge about, the clock and data lines go directly to the FPGA so whatever is happening relates to that device, something I expect most of you would have already known anyway.

The FPGA used is the C8 variant, the slowest one... maybe it is too slow ? https://www.intel.com/content/www/us/en/docs/programmable/683794/current/fpga-device-datasheet.html

--- End quote ---
;D

Picked up on this again with HQ and you might remember the good work you did for us a while back on this issue.
https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/msg5029306/#msg5029306

Let's see what they can put together for the few that have these STB-3 I2C issues.
 :popcorn:
InvisibleMan:
To add another data point re the I2C decode issues:

I have board no.38 (Serial JXX170227GAA0038RoHS) and mine is ok with I2C
Gathering data from the other STB-3 threads it looks like this I think:

Board no
10 (tautech) = ok
38 (mine) = ok
146 (Mathstudi) = problem
248 (Martin72) = problem

So it looks like something changed between boards 38 and 146?
Kean:

--- Quote from: InvisibleMan on October 18, 2024, 09:10:44 pm ---I have board no.38 (Serial JXX170227GAA0038RoHS) and mine is ok with I2C

--- End quote ---

Those are likely only a sequential number in a production batch.
e.g. the serial number in Defpom's video linked above is MK160803BAA0093 - which I'd guess is an earlier batch than the ones beginning JXX170227

As these are targetted to education, I'd expect they have made many more than a few hundred units.

Edit: I see in Simmi's video his seems to start with JXX170227 - but it isn't quite clear and partly obscured by a cable.

Edit 2: OK, I see more serial data in that year old discussion and all but Defpoms seem to begin with JXX170227
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