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m24sr64 - i2c problem - token release sequence

Question asked by Catheline Yoan on Dec 11, 2017
Latest reply on Dec 14, 2017 by NFC software support 3



i use the nfc memory m24sr64 with the dedicated source code ("STM32CubeExpansion_NFC1_V1.6.0").

I have an issue using the i2c token release sequence, supposed to close the i2c session.

In fact, our micro sends the start condition and the slave adress, but then, the ms24sr blocks the SCL line to low level for 28ms before releasing it.

Then the stop condition occurs.

So, during the i2c token release sequence, our micro sends 8 clock period for the start and the slave adress, and the 9th appears 28ms later.

So, the token release sequence seems not being correct, compared to the sequence on the m24sr64 datasheet.


Do you have an idea why the m24sr64 should block the SCL line during the token release sequence, although we send its correct adress ?


thank you !