Hello,
"The drive current is affected by the configuration of the buffer. For those buffers, you can
use to DSE field in the controlling IOMUX registers to set the drive strength. There are also
a slew rate controls in those registers which may also have an effect."
Please refer to the following app note for more details.
“Influence of Pin Setting on System Function and Performance”
http://www.nxp.com/assets/documents/data/en/application-notes/AN5078.pdf
The best way to estimate currents is to use the IBIS model for the IO(s) you care about.
Please refer to i.MX6 Hardware Development Guide, Chapter 7 (Understanding the IBIS Model)
how to use parameters, provided in the model.
< http://cache.nxp.com/assets/documents/data/en/user-guides/IMX6DQ6SDLHDG.pdf >
IBIS file shows tables with the buffer drive current across a range of pad voltages. You can look through the
list to find the current at the voltage of interest.
"Note that the IBIS model covers a wider range than the conditions allowed in the datasheet so not everything
in the IBIS model is an allowed use case. Also, these currents in a real case would be transient lasting only
nanoseconds or less. This does not imply you could run the buffer at that current for an extended period of time.
That would cause overheating on the part and create reliability problems."
Regards,
Yuri.
