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TCA6418E: TCA6418E Low Standby current Mode?

Expert 3910 points
Part Number: TCA6418E

Hello Team;

Could you specify what is Low Standby current mode for TCA6418E? 

The datasheet "FEATURES" specify "• Low Standby (Idle) Current Consumption: 3 μA", but no detail for this mode..

Thanks 

Macs - Japan CSC

  • Hello Mac,

    I am not sure if you are new to E2E but the fastest way to get an answer to a question is to search E2E.  I simply typed "Standby Current Mode" and got 15+ results in a matter of seconds.  The forum is a database of questions asked and answered.  If you look through the search results and don't find an answer then post to the forum and we will be happy to answer the questions, especially since it may have not been asked before.  We are always looking to expand the database, but not with duplicate answers or questions.  

    Here is the link to a post that answers your questions:

    e2e.ti.com/.../457085 current

    -Francis Houde

  • Hello Francis-san,

    Thank you for your reply. I understand your point what you would like to say.
    However, I did check E2E and I could not find information what I(and our customer) would like to know.

    The point what customer wish to know, is , "Low Standby (Idle) Current Consumption: 3 μA" is written on
    features on datasheet top, However, there is no specification written on "Electrical Characteristic".

    I think condition of this spec., is same as Icc Spec. with fscl=0 kHz, however, specification is 13uA(Max), and
    no typical data written. So, question is, where the "3uA" comes from?

    The customer would like to use in "Wearable product",so it require very low power, so that he would like to minimize
    power consumption while it is not used(Idle time).
    And he need to confirm minimum power consumption for this device.

    Could you inform what is idle current in typical and Maximum if you have, and confirm test condition is same as
    Icc measurement spec.?

    Thanks
    Macs-Japan CSC

  • Hi Macs,

    (Francis is out of office this week, so I will help look into this question.) I agree with you that these specs are not very clear, since the ICC spec that you mentioned (with fSCL at 0 kHz) does seem like a "standby" condition. I am checking this with our design team for this device to help better understand these specs. I should be able to get back to you in a day or two with a more clear answer.

    Max
  • Hi Max-san

    Thank you for your support. I shall waiting your reply.

    By the way,

    Do you have typical number of Icc with 400kHz  and 1Mhz SCL?  just in case if you have.

    Otherwise I can reply to customer that "We do not have".

    Best Regards.

    Macs

  • Macs,

    The typical ICC for 400 kHz is below:

    VCC = 1.8 V: 3.1 uA
    VCC = 2.5 V: 4.9 uA
    VCC = 3.3 V: 7.9 uA

    Here is the data for 1 MHz:

    VCC = 1.8 V: 6.9 uA
    VCC = 2.5 V: 11.5 uA
    VCC = 3.3 V: 16.7 uA

    We are still trying to find data on the maximum spec - I will update you next week on that.

    Best regards,
    Max
  • Hi Max-san,

    Thank you for data what I ask for.  Appreciated.
    Macs

  • Macs,

    For the standby current spec - 13 uA is the correct worst-case number accounting for variations in process tolerance, supply voltage, and operating temperature. The typical value will match what is shown in the applications curve, which is a little lower than the 3 uA value given in the front-page features (which is a more conservative number).

    Max