TM4C1294NCPDT: GPIO VOL V-I Curves

Robert Berrington

Tool/software:

The datasheet provides VOL and IOL information as maximum. I would like to get a V-I curve of the GPIO output in the FAST GPIO Pad mode so I can see what the maximum VOL if the circuit is sinking around 1mA of current.

over 1 year ago

0 Charles Tsai over 1 year ago

TI__Guru**** 191886 points

Hi Robert,

Sorry, a V-I curve is not available in the datasheet as I think this will depend on the load attached to the pin. We only specify the max Vol which is 0.4V. Most GPIO pins on TM4C129 are capable of sinking 12mA. For sinking 1mA current, I will expect the Vol to be much less than 0.4V. I will expect to be around 0.4 / 12 or less than 0.03V.

0 Robert Berrington over 1 year ago in reply to Charles Tsai

Prodigy 20 points

Will a SPICE or IBIS model provide further support? I agree, the output should be linear so that 0V @ 0A ... I'm hoping to find something more to support worse-case circuit analysis.

+1 Charles Tsai over 1 year ago in reply to Robert Berrington

TI__Guru**** 191886 points

Hi Robert,

You can find the IBIS model at https://www.ti.com/lit/zip/spmm829

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TM4C1294NCPDT: GPIO VOL V-I Curves