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Altera_Forum's avatar
Altera_Forum
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19 years ago

LED drivers in MAXII

Does anyone know which IO pins are associated with ground/vcc groups in a MAXII device for use as a LED driver?

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  • Altera_Forum's avatar
    Altera_Forum
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    19 years ago

    You need to look at the max II's full pin-out file on the web to see this. The Pin/Pad function column shows you where the GNDIO pads (or VCCIO pads) are relative to IO pads. Any group of IO pads between any GNDIO pads constitute a current group that must not violate the current shown in AN 286 - table 3.

    For each IO pad in the pin/pad function column, you'll have to scroll over in the same pin-out row to see the package pin it corresponds to for the package you are using. Many I/O pads may not bond out to the package pin.
  • Altera_Forum's avatar
    Altera_Forum
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    19 years ago

    One more thing to note - run the electro-migration current option in Quartus to ensure that you are not in violation of the current spec for each group. Put the electro-migration current assignment with a value of the static current the pin will drive for each pin driving LEDs or other resistive loads. This way, Quartus will check your pinout against the current density restrictions.