Custom power module

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1

Hi guys

I’m trying to build a custom power module with a USB socket for deploying and D socket to power my boards. From the schematics (SP, DP and AA module) i see that there is a signal UD_Vbus connected to socket D. In SP and AA modules it is connected to pin 3, in DP module it is connected to pin 6. This signal seems to be a part of the USB 5V (it is connected to a voltage divider).
From the schematics of cerberus board, i see that pin 3 is connected to PA9 of the processor (pin 42) and pin 6 is connected to PB12 (pin 33). But for G120HDR board, pin 3 and pin 6 are not connected.

So, my questions are:

  1. Do i need to connect UD_VBUS to pin 3 (or pin 6) of the D socket?
  2. What is the purpose of that signal?
  3. My custom module is going to be powered by batteries, LM1117 is a good/efficient LDO to generate 3,3V?

Thanks

2

Most boards needs only 3V3 supply, some might also need 5V (also needed for some modules).
It does not matter by which gadgeteer connector you supply the power.

3

My custom power module will be used (mainly) to power a G120HDR with some modules, so i’m going to feed a D socket with 3,3V and 5V. I’ll add UD_VBUS to pin 3 just in case, even i thing that G120HDR doesn’t use it.

Thanks guys for your help.