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TLIN1021A-Q1: Section 9.4.4.1 Clarification

Nikola Zlatanovski
Prodigy 305 points
Part Number: TLIN1021A-Q1
Other Parts Discussed in Thread: ESD1LIN24-Q1

Hello LIN team,

 I wanted to clarify the following two sentences on the second paragraph:
"The LWU circuitry is not active in normal mode. To minimize system level current consumption, the internal bias voltages of the terminal follows the state on the terminal with a delay of tWAKE(MIN)."

Does this mean that if we do not put the device in normal mode within the t_wake(min) our device will go back to sleep mode?

 Thank you,
Nikola

  • 0
    TI__Mastermind 26826 points

    Nikola,

    Thanks for reaching out! This is referring to the WAKE pin on the device. It can either be held HIGH or LOW when unused, but if we implemented a single-direction pull-up or pull-down internal on the WAKE pin to keep it stable, there is a risk that there would be a lot of leakage current if the designer tied the pin a particular direction. For this reason, the pin actively switches its internal bias between HIGH and LOW based on whatever the state of the pin is. This helps minimize leakage current by ensuring that the bias matches the state of the pin. If you change from HIGH to LOW, for example, the internal bias on the pin will switch from HIGH to LOW as well after tWAKE(MIN).

    A constant high level on WAKE has an internal pull-up to VSUP, and a constant low level on WAKE has an internal pull-down to GND.

    Best,

    Danny

  • 0 in reply to Danny Bacic
    TI__Prodigy 305 points

    Hi Danny,

     Thank you for your response and clarification. 

     But our customer is interested in knowing the amount of they have from waking up the device to set it to normal mode before it goes back to sleep. 
     Maybe you explained this, but I am still not getting how this truly works.

     Also do you have a recommended protection device to go along with the TLIN1021A-Q1?

    Thanks!
    Nikola

  • 0 in reply to Nikola Zlatanovski
    TI__Mastermind 26826 points

    Nikola,

    I see, thanks for the clarification. Once the device is placed in Normal mode, it will stay in that mode indefinitely until EN is LOW or until VSUP is removed (power-off).

    For ESD protection, we frequently recommend ESD1LIN24-Q1, which is specifically designed for LIN protection.

    Best,

    Danny

  • 0 in reply to Danny Bacic
    TI__Prodigy 305 points

    Danny I think we are still missing each other's points.

    My question is: TLIN is in sleep mode. I decide I need to send an instruction. I wake up TLIN1021A-Q1. What is the exact amount of time I have to send that instruction to TLIN1021A-Q1 before it goes back to sleep mode?

    This is where my confusion comes in as to what t_wake exists for. 

    Sorry for the confusion, please set up a WeBex call with me if you are not understanding what I am asking.

    Best,
    Nikola

  • 0 in reply to Nikola Zlatanovski
    TI__Mastermind 26826 points

    Nikola,

    There is no timer involved. I am thinking you might be referring to the sleep-wake timer that exists on some of our CAN devices. The TLIN1021A-Q1 family has no such timer.

    Best,

    Danny

  • 0 in reply to Danny Bacic
    TI__Prodigy 305 points

    Answer:
    No, it stays in Standby mode, only way to go back to sleep is if you go to Normal mode and then you set it to sleep.