Power and signal

Schematic
1

Hello Guy
I’m New to using Kicad, I have always used PADS
I have some questions about the power signal and some signal

example I have signal Miso and Mosi for SPI, I have multi slave so i have connected together
Miso and Mosi on different items about MOSI signal don’t have any problem
but on the Miso signal I have on every pin this error “the output type pin and output are connect”
how I can fix this issued ?

The same problem have on all my power net how I can fix this issued too

thank you Luigi

2

Of course you have problems. You can’t just connect MISO outputs together (or any other outputs for that sake).
You’ll need 3-state outputs for the different slave devices. Otherwise it won’t work, neither in KiCAD, nor in the real world.

3

If you have slaves that tri-state their MISO pin when CSn is inactive, then that is quite ok. Depends on the part. On a slave that tri-states, the miso pin def should not be “output,” but “tristate” in the symbol editor.

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9 posts were split to a new topic: Attempted cleanup of a derailed thread

5

I like to replace guesswork with hard data.

Can you post the relevant part of the schematic, or at least part numbers?

1 Like
6

thank you for your reply, I have modify the symbol with Tri-State

7

thank you for yuor reply, I have modify the symbol with Tri-State
but what about the power ?

immagine
immagine2560×1440 287 KB

8

Hi thank you for your reply see attached drawing

immagine
immagine2560×1440 287 KB

9

This is the relevant pat I guess:

image

I assume you only want to place one of these voltage regulators, but ERC in KiCad does not know this, and therefore it treats it as a short circuit between two power supplies. But that is only for the output. I do not know why there is an ERC violation arrow on the input.

To solve the “shorts” between the outputs, there are a few options.

  • You can set one of the outputs to passive.
  • You can suppress the ERC error for this particular case.
  • You can use a net tie to split the nets.
1 Like
10

Most likely becausea global input label is connected to a power net.

11

There is nothing wrong with connecting a label to a power net.
But I can’t see where the _12V comes from, and I don’t like to make un- backed assumptions.

12

Thank you for your prompt reply

13

Thank you for your prompt reply
yes I want only mounting one of this components,
Iwill modify the pin with passive type

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