# Power In

Source: https://forum.modalai.com/topic/2589/power-in
Category: VOXL 2 and VOXL 2 Mini (https://forum.modalai.com/category/26/voxl-2-and-voxl-2-mini)
Tags: voxl-2-io
Posted: 2023-08-23 16:16:28 UTC by wilkinsaf
Replies: 2 · Views: 1476

## wilkinsaf · 2023-08-23 16:16:28 UTC

Hello,

I am looking to create a carrier board for the VOXL2 utilizing the J3 and J5 IO, and had a couple questions. 

1. Power: I can see that there is power input on the J5 connector for 5V in, but I am slightly confused by the pinouts under [J5 section](https://docs.modalai.com/voxl2-connectors/#j5---high-speed-board-to-board-connector-hsb2b). It appears that there is multiple 5V input pins. ![a6acedf5-1ecb-4f50-acfb-f75b34c0f3d2-image.png](https://forum.modalai.com/assets/uploads/files/1692807199718-a6acedf5-1ecb-4f50-acfb-f75b34c0f3d2-image.png). I am not an electrical engineer. So, let me know if I need to bring in one on this to understand what these mean. 
2. Mapping pins to paths on linux. I can see that with QUPs we can define what protocol different pins are doing. How do we then map those to a linux path (such as /dev/ttyS0 or something)

Thank you for the help, and please let me know if I need to seek outside resources/counsel to better understand these things. I am trained in software, but trying to better understand this. Thank you!

## Reply by Vinny (ModalAI staff) · 2023-08-24 20:13:07 UTC

Hi @wilkinsaf 
Please refer to this tech docs page and let me know if this helps!
https://docs.modalai.com/expansion-design-guide/
More specifically, these sections:
https://docs.modalai.com/expansion-design-guide/#5v-power-in-vs-5v-power-out
VDCIN_5V has 8 pins in order to meet the 6A current constraint we need.
So, any custom carrier card that intends to provide power TO Voxl2 must have a 6Amp supply and drive those 8 pins together.

For the SW question, I'm not the expert, so hopefully this link helps...
https://docs.modalai.com/voxl2-linux-user-guide/

And, as a teaser... we are in process of building this new board right now... working on the docs at this very moment (so some data is irrelevant as a copy->paste, but it'll be all updated in the next few days): https://docs.modalai.com/voxl2-dev-test-board/
This is the very first public announcement of this new test board. I have hooks in there to test 5V delivery from an external system. SCH will be posted later today :-)

## Reply by Vinny (ModalAI staff) · 2023-08-24 22:02:34 UTC

Hi @wilkinsaf 
Our Schematic for the "B-Quad" (Voxl2 Developer Test Board, M0144) are live!!
https://docs.modalai.com/voxl2-dev-test-board-datasheet/#schematics

In there, you can see an example of how to design the proper connections for powering Voxl2 from J5. VDCIN_5V would be from a 6A capable power supply on your host system (carrier board):
![80eff3be-05ab-47a2-968a-3425fefebe49-image.png](https://forum.modalai.com/assets/uploads/files/1692914469252-80eff3be-05ab-47a2-968a-3425fefebe49-image.png)