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Posts: 2
Registered: ‎02-10-2017

SI5351A-B04486-GT

Hello,

Is it possible to program outputs (CLK0 to CLK2) via I2C on frequencies different from factory programed ? Is it possible to clear NVM and how do I ?

Best regards.

<a href="http://community.silabs.com/t5/Welcome-and-Announcements/Community-Ranking-System-and-Recognition-Program/m-p/140490#U140490"><font color="#000000"><font size="2">Hero</font></font> </a> jmg
Posts: 1,082
Registered: ‎04-27-2004

Re: SI5351A-B04486-GT


Is it possible to program outputs (CLK0 to CLK2) via I2C on frequencies different from factory programed ? 



Yes. i2c interface always works.
Factory option is just a power-up default.

Is it possible to clear NVM and how do I ?


It may be possible, but is undocumented and likely needs some specific and special Vpp supply.

 

You can buy Si5351 programmed how you want - check with Silabs, on the volumes needed.

Posts: 2
Registered: ‎02-10-2017

Re: SI5351A-B04486-GT

Hello,

And thanks for the answer.

Trying hard, but I can't set clocks to work on desired frequency - Si5351 always running on the factory "programed" one. Could someone explained what to do after initialization ( after NVM transfered to RAM). Which registers I have to change....

 

Thanksin advance.

 

<a href="http://community.silabs.com/t5/Welcome-and-Announcements/Community-Ranking-System-and-Recognition-Program/m-p/140490#U140490"><font color="#000000"><font size="2">Hero</font></font> </a> jmg
Posts: 1,082
Registered: ‎04-27-2004

Re: SI5351A-B04486-GT

[ Edited ]

Trying hard, but I can't set clocks to work on desired frequency - Si5351 always running on the factory "programed" one. Could someone explained what to do after initialization ( after NVM transfered to RAM). Which registers I have to change.... 


Do you have a non factory programmed Si5351 you can try (like the adafruit Si5351 breakout?)

 

There is a certain non-linear pre and post amble writes needed in Si5351A, and I've already suggested to SiLabs, that the Clock builder could generate tables that include those writes.

That way, users hardly need read/retry the manuals & appnotes.