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TCA9509: VILC > 0.4V solution recommendation

Ann_Lien
Genius 12110 points
Part Number: TCA9509
Other Parts Discussed in Thread: TCA9800, , TCA9517A, TCA9517, PCA9515B

Tool/software:

Hello expert,

My customer would like to know if we have solution which VILC on A side is larger than 0.4V? They want to find a solution which VILC>0.4V or remove 1mA current source capability. Thanks a lot!

Best regards,

Ann Lien

  • 0
    Guru 277020 points

    Solution for what problem? Buffering? Level shifting (between which voltages)?

    For systems not above 3.3 V, use the TCA9800/1/2/3 (which has a current source on the B side, but no strict VIL requirement).

  • 0
    TI__Mastermind 30713 points

    Hi Ann,

    Does the customer need VILC > 0.4V due to too low VILC on TCA9509 A-side? 

    Can the customer look into what Clemens suggested with the TCA980x devices which do not have internal current source on A-side. ICS is on the B-side. Low-level and high-level supply voltages are more lenient on the TCA980x. 

    Can the customer use the TCA9517 or TCA9517A and connect the B-side to the application requiring VILC > 0.4V? 

    Regards,

    Tyler

  • 0 in reply to Tyler Townsend
    TI__Genius 12110 points

    Hello Tyler,

    But for TCA980x series, we've already checked the spec and it should not be okay to use also due to voltage level invalid on A side. For TCA9517A, customer also rejected due to voltage level invalid.

    if Vilc in B side, this voltage need to less than Vilc of 9515 (0.47~0.6).

    If for 9517, Vol is 0.45~0.6, not less than (0.47~0.6)

    May you have other choice for customer? Thanks a lot!

    Thanks a lot!

    Best regards,

    Ann Lien

  • 0 in reply to Ann_Lien
    Guru 277020 points

    The TCA980x's A-side VIL is 30 % of VCC.

    What are your customer's voltage level requirements? At what supply voltage?

  • 0 in reply to Ann_Lien
    TI__Mastermind 30713 points

    Hi Ann,

    Similar to what Clemens has suggested here, what does the customer mean by "also rejected due to voltage level invalid?" 

    Regards,

    Tyler

  • 0 in reply to Tyler Townsend
    TI__Genius 12110 points

    Hello Tyler and Clemens,

    Please see customer's requirement, thanks!

    ============================================================

    For 9800, B side has Vilc voltage, and  it connects to 9515. Thus does not work.

    Thanks

    ============================================================

    Best regards,

    Ann Lien

  • 0 in reply to Ann_Lien
    Guru 277020 points

    The TCA9800 does not have a VILC limit (but it does have IILC limit and RILC limits).

    We cannot help you if we do not know the requirements. What are the supply voltages on both sides, and what are the devices (and their voltage thresholds) on the A side?

  • 0 in reply to Ann_Lien
    TI__Mastermind 30713 points

    Hi Ann,

    Does the customer have a schematic of their implementation with voltage supplies, and which side is connected of the TCA9800 and PCA9515B? 

    Regards,

    Tyler

  • 0 in reply to Tyler Townsend
    TI__Genius 12110 points

    Hello Tyler and Clemens,

    Customer is using TCA9800 B side connected to PCA9515B. Thanks!

    Best regards,

    Ann Lien

  • 0 in reply to Ann_Lien
    TI__Mastermind 30713 points

    Hi Ann,

    The customer needs to flip TCA9800 A-side and b-side. PCA9515B implements static voltage offset on both sides of the device. 

    The B-side internal current source of the TCA9800 should not connect to a SVO and should not have any pull-up resistors on B-side. 

    Is it possible for the customer to make the change? 

    Regards,

    Tyler