AnsweredAssumed Answered

DSI PLL doesn't work with HSI

Question asked by Devera.Martin on Mar 23, 2017
Latest reply on Mar 24, 2017 by Devera.Martin

Hello,

I use DSI with external 25MHz osc. In some design I wanted to use

HSI (is seems supported wrt. ref.manual) but the DSI PLL doesn't

lock at all.

I use IDF=3 to have INFIN=16/3>4MHz and NDIV=125, thus Fvco=666MHz.

ODF=2 (/4) hence DSI clk is 166MHz. All is in correct range.

 

With HSE, the only difference is IDF=4...

 

Maybe, HSI is not stable enough ?

 

M.

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