Solved
I looked for AN5428 mentioned in RM0438 rev. 7 on Page 100, and did not found it.
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Sorry for the inconvenience, the RM0438 has not yet been corrected.
The same question has already been answered here:
Please note that this application note is no more available.
Its content is currently moved to the reference manual RM0438. All references to this application note will be removed.
Regards
/Peter
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