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EJ.1
EJ.1
Associate II
May 10, 2020
Solved

ST25DV04K I2C@400kb/s compatibility?

  • May 10, 2020
  • 1 reply
  • 765 views

Hello, I could not infer from the datasheet that ST25DV04K could be used at fast mode I2C speeds (400 kb/s). The datasheet states "Two-wire I2C serial interface supports 1MHz protocol". The datasheet does not mention compatibility with other I2C speeds. I want to confirm that the IC will work for I2C@400 kb/s operations smoothly

Thanks,

Eshwar

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Best answer by JL. Lebon

​Dear Eshwar,

The ST25DV04K is compatible with Standard-mode (100Kb/s), Fast-mode (400Kb/s) and Fast-mode Plus (!Mb/s).

Actually I2C clock can be any value up to 1 MHz. It doesn't really matters if you don't match exactly with Standard or Fast mode clock frequency, as long as you do not exceed the 1MHz clock of the Fast-mode Plus.

Best regards.

1 reply

JL. Lebon
JL. LebonBest answer
ST Employee
May 12, 2020

​Dear Eshwar,

The ST25DV04K is compatible with Standard-mode (100Kb/s), Fast-mode (400Kb/s) and Fast-mode Plus (!Mb/s).

Actually I2C clock can be any value up to 1 MHz. It doesn't really matters if you don't match exactly with Standard or Fast mode clock frequency, as long as you do not exceed the 1MHz clock of the Fast-mode Plus.

Best regards.

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