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Hardware guideline for Concerto F28M35x

Franz Boeni
Intellectual 545 points

Dear all

I only can find the schematic of Concerto DIMM100. In this schematic every 3.3V pin has his own choke (Inductor Bead, 60Ohm, 0805, 100MHz) after this choke every pin has a own 2.2uF capacitor.

Is it possible to reduce the number of choke. (save cost)  Some 3.3V pins are very closed to the next. 

Where I can find other schematic example and a guideline how to power the concerto devices.

Where I can find a hardware guideline.

Franz Boeni

  • 0
    TI__Guru 57255 points

    Franz,

    Absolutely, the key thing is that if reduce the amount of inductor beads, make sure that the current specification of the beads can handle the current used by the Concerto device and that the frequency spec of the inductive beads doesn't completely choke off the power usage.

    In fact, you can completely remove the inductive beads if you wish.  The reason we have them is to try and reduce the amount of noise transmitted on the Concerto from getting to the main supply.

    Note that the capacitors on the 1V8 & 1V2 rails are NOT optional.  See the device datasheet for more information.


    Thank you,
    Brett

  • 0 in reply to Brett Larimore
    Expert 1380 points

    Brett,

    do we need to use capacitors on 1V8 and 1V2 if we power Concerto from external regulators? Is there any spec for voltage rail noise for these pins?

    Also is it necessary to tie the power rails 1V8 together outside if using internal regulation? The same is for 1V2.

  • 0 in reply to Dmitry Vasilenko - Arrow
    TI__Guru 60865 points

    Yes, you will still need caps on these rails if using an external regulator.  The data sheet of your regulator will likely also suggest a capacitor value for the output rail.  Take the max of the two suggestions( and make sure to still meet the ESR requirements of your regulator).

    Yes, I believe you will want to wire the pins together and put a cap on that net.