TWR system power from custom module?

[eliasmaroglou]

We would like to power the kinetis k40 module from a module that acts also as a power supply for many things. Should we connect the traces for all the supply pins on the PCI-e connectors or just a few are enough? I mean we have to make traces that go to all 3.3 V, 5V and GND pins of the TWR elevators to make the k40 work or if i make like... 2-3 for each it should be ok?

[Jorge_Gonzalez]

Hello Elias:

Not exactly the response to your question, but I recommend you to check the next application notes:

AN4649 Power for the tower:

http://cache.freescale.com/files/microcontrollers/doc/app_note/AN4649.pdf

AN4390 Creating your own Tower Module:

http://cache.freescale.com/files/32bit/doc/app_note/AN4390.pdf

I am unsure about how many pins you should connect, as it depends on the current that you need to drive. Maybe you can give a check to the design files of the primary tower elevator, and see how many lines are routed from the USB and 3V3 regulator to the actual elevator pins.

Regards!

Jorge Gonzalez