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DS100BR410: Problem for over high speed SMBus function

Satoshi
Guru 19485 points
Part Number: DS100BR410
Other Parts Discussed in Thread: LMK03318

Please let me know about SMBus function of DS100BR410.

Datasheet is described 10kHz～100kHz, but customer using over 100kHz SMBus speed(150kHz).

Is there any abnormal operation at over speed SMBus condition?

Best regards,

Satoshi

  • 0
    TI__Mastermind 29635 points
    Hi Satoshi-san,

    When this part was characterized, it was not tested for operation beyond 100 kHz, and therefore we cannot guarantee that the DS100BR410 will respond properly to SMBus communication if the SMBus speed exceeds 100 kHz. It is possible that the DS100BR410 may respond correctly with a speed over 100 kHz, but this is not ensured by production tests.

    We recommend that the customer reduce the SMBus speed to 100 kHz so that the operation is within the designated DS100BR410 datasheet limits.

    Michael
  • 0 in reply to Michael Lu (Santa Clara)
    Guru 19485 points
    Michael-san

    Thank you for reply,
    Additional question, the same I2C bus is connecting DS100BR410(100kHz) and the other device(400kHz).
    If command to DS100BR410 is 100kHz only (and the other device command is 400kHz), is this connection no problem?

    Best regards,
    Satoshi
  • 0 in reply to Satoshi
    TI__Mastermind 29635 points

    Hi Satoshi-san,

    It may be possible that this may still be an issue. Since the DS100BR410 is connected to the same bus, it will still "see" 400 kHz on SCL even though the master is not addressing the DS100BR410, and this may cause the DS100BR410 to misread the SDA. For robustness, is it possible to run at 100 kHz for that entire bus?

    Thanks,

    Michael

  • 0 in reply to Michael Lu (Santa Clara)
    Guru 19485 points
    Michael-san

    Sorry for my reply delay,

    Customer was accept 100k±1% bus.
    On the condition of DS100BR410(10k～100k) and LMK03318(100k～400k) are the same 100k±1% bus, is this no problem?
    Please let me confirm just in case.

    Best regards,
    Satoshi
  • 0 in reply to Satoshi
    TI__Mastermind 29635 points
    Hi Satoshi-san,

    If the SCL line is operating at 100 kHz for both devices as you mentioned, then I think this will work without issue.

    Regards,

    Michael