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TLIN1021A-Q1: to replace TPIC1021 issue

David Yang
Intellectual 520 points
Part Number: TLIN1021A-Q1
Other Parts Discussed in Thread: TPIC1021,

Hi,

 RnD use TLIN1021A to replace TPIC1021. RnD made testing directly replacement and found that the supply current is bigger.

Tested result:  TLIN1021A: about 10mA, TPIC1021: about 1mA.

Do  you have any suggestion to reduce supply current? 

Thanks & best regards,

  • 0
    TI__Mastermind 24205 points

    Hi David,

    This is interesting to hear as the TLIN1021A-Q1 should not be consuming this much supply current. Even when the device is in Normal mode (highest current consumption) and when the bus is dominant, the maximum current consumption of the device is 6.5 mA (though typically closer to 1.2 mA). All other modes and bus states consume less than this.

    Could you help clarify how you are measuring current into the supply of the device when measuring 10 mA?

    Best,

    Danny

  • 0 in reply to Danny Bacic
    Intellectual 520 points

    Dear Danny,

    The application circuit is as below. TLIN1021 INH will enable system block when power on, and it will cause the product power consumption to become high. Does Wake up cause INH pin to become high when power on? (TLIN1021) Customer is need to keep system block at disable status( INH: LOW) when power on. Do you have any suggestion for this application?

    TLIN1021

    TPIC1021

  • 0 in reply to David Yang
    TI__Guru 53160 points

    Hi David,

    Danny is currently out of the office until next week. He should be able to get back to you by then.

    Thanks for your patience.

    -Bobby

  • 0 in reply to David Yang
    TI__Mastermind 24205 points

    David,

    I see what you mean. So, to be clear, you are not indicating that either transceiver is consuming this much current, but rather that the entire system is consuming higher current circa 10 mA.

    There is a state machine difference between the old TPIC1021 (NRND) and the TLIN1021A-Q1. Note that, upon power-up, the TLIN1021A-Q1 enters Standby mode where INH is HIGH. This is contrary to the TPIC1021 where a power-on cycle would not wake up the device.

    In Standby mode, the INH pin of the TLIN1021A-Q1 would activate the power supply since it is HIGH. This would require a cycle of system power, bringing the EN pin high to transition TLIN1021A-Q1 into Normal mode, and then upon entering Sleep mode, bringing EN low to transition TLIN1021A-Q1 into Sleep mode which would bring INH to LOW and disable the voltage regulator.

    Best,

    Danny

  • 0 in reply to Danny Bacic
    Intellectual 520 points

    Dear Danny,

    Because the product is MP, Modify MCU code is difficult. Is there item that Wake-up pin function same as TPIC1021?

    Thanks  & best regards,

  • 0 in reply to David Yang
    TI__Guru 53160 points

    Hi David,

    Danny will get back to you tomorrow.

    -Bobby

  • 0 in reply to BOBBY
    TI__Guru 65202 points

    David,

    Unfortunately no, the WAKE feature on TPIC1021 is different from the TLIN1021A-Q1 in that it is not bi-directional. In either case, the WAKE pin wouldn't be a way to put the device to sleep, so this isn't a valid workaround. Both devices require EN to be low to enter sleep mode though, so shouldn't the software be able to do the same with the TLIN1021A-Q1 upon power up? 

    Regards,

    Eric Hackett