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[FAQ] AM2432: GPIO MAX output current

Biao Li
Expert 6720 points
Part Number: AM2432


Tool/software:

Hi Expert,

customer want to use AM24 GPIO to drive a LED, so they want to know what the max current is we can output from GPIO? Thanks for support in advance.

BR,

Biao

  • 0
    TI__Guru**** 206590 points

    Hello Biao,

    Thank you for the query.

    You need to check 

    7.7.6 LVCMOS Electrical Characteristics

    Please review the LED forward drop and  LVCMOS Electrical Characteristics to verify the usability

    You need to perform simulation in case the current draw is higher than the data sheet specs and this is not recommended. It is recommended to buffer the IO to drive higher LED current.

    Regards,

    Sreenivasa

  • 0 in reply to Kallikuppa Sreenivasa
    TI__Expert 6720 points

    Hi Sreenivasa,

    In datasheet, only min value be defined. I can't see the max current. can you tell me what is the Max?

    BR,

    Biao

  • 0 in reply to Biao Li
    TI__Guru**** 206590 points

    Hello Biao, 

    Thank you.

    Not sure i understand the query.

    We do not recommend loading the IO more than the current mentioned in the data sheet.

    To understand the behavior with higher output load, it is recommended to perform simulations.

    Regards,

    Sreenivasa

  • 0 in reply to Kallikuppa Sreenivasa
    TI__Guru**** 206590 points

    Hello Biao, 

    Additional inputs for reference.

    For background, this IOL/IOH spec is not meant to convey any information towards switching speed, actual current while driving capacitive load etc.  Our IBIS model can be used to understand the transient characteristics of our IOs.

    Rather, what the spec is trying to say (take the 1.8V spec as an example:)

    We are able to drive a logic 1 and source "at least" (min) 3mA of current and still maintain a VOH higher than the min spec of VDD(1.8V)-0.45=1.35V.  Similarly, to drive low ... we can sink at least 3 mA of current and still maintain a VOL lower than 0.45mv.

    Considering 1.8V/3mA = 600 Ohm.  That implies we can easily drive a PU/PD in the 2.2k to 10k range.

    Regards,

    Sreenivasa