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etherkit / Si5351Arduino

Library for the Si5351 clock generator IC in the Arduino environment
GNU General Public License v3.0
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Burst of noise instead of sine #45

Closed la3pna closed 6 years ago

la3pna commented 7 years ago

Just some incoherent notes when fault finding a issue here: From time to time I see a burst of noise output from the Si5351B with VCXO control. It does not appear to happen each time the Si5351 is powered up. Disconnecting, then re-connecting power seems to restore it to propper operation.

Not sure if its due to my implementation, or if its a library issue at all.

Need to determine if this is a HW issue or FW, and if its reproducible. Should determine if the Si5351 reports the correct data, if not try a reset() to see if that fixes it.

Thomas.

la3pna commented 7 years ago

This look more and more like a HW issue for now. Will investigate more. If you want to close it @NT7S , I can re-file if it isn't a HW problem.

la3pna commented 7 years ago

The burst of noise problem seems to be same as no output. It happens only the first time a board is powered up. A reset fixes this problem. Did determine that the Si5351 does report correct data even tho there is no output. Need to look at what the microcontroller sends to the Si5351 with a logic analyzer. Thomas.