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TPS65920 I/O Output Current Drive (e.g, 32KCLKOUT, HFCLKOUT, etc.)

Charles McCarthy
Intellectual 500 points

Hello All. 

My question is similar to a post from a few months ago, "TPS65930/20 digital signals IO current drive."  In that post the user asked the same question I am asking now and was referred to Table 2-1 in the datasheet (SWCS037E).  However, the datasheet drive characteristics of Table 2-1 is incomplete.  Specifically, I would like to know the output drive capability of the following pins:

1) 32KCLKOUT

2) HFCLKOUT

3) GPIO13

4) Keypad Column current sink capability.

Thanks!

Charles

  • 0
    TI__Genius 15100 points

    Hi,

    The clocks drive strength is 40pF, refer section 11.2.2 and 11.3.1 in the data manual.

    GPIO13 load capacity is in table 3-4, 30pF.

    Is there a specific reason/application you are trying and hence need the keypad sink current capability?

    If you use standard applications there isnt any reason to worry. Keypad module has been used by customers and there isnt any issue. I would say that the current would be quite small, however, I dont have any value that I can provide.

     

    Regards,

    Gandhar.

     

  • 0 in reply to Gandhar Dighe
    Intellectual 500 points

    Gandhar, thank you for the reply.  However, I am wanting the current drive strength (in mA), not the load capability.

    1) 32KCLKOUT -> maximum drive current =?

    2) HFCLKOUT -> maximum drive current = ?

    3) GPIO13 - maximum drive current = ?

    The reason is I am wanting to use the clocks on multiple devices.

    Regarding the keypad sink current, my application is not a typical keypad situation.  I am upgrading an existing product that interfaces to another PCB with the "keypad" on it.  This "keypad" is individual switches with pull-ups.  Because of the external pull-ups on the switch signals I would like to know if they are too strong or not.  Thus I need the current sink capability of the keypad column signals.

    Thanks!

    Charles