Minimum Schematic for P1 module

I saw that the EAGLE files for the P1 (WM-N-BM-14) modules are up on Github. However, does anyone have a “Bare Minimum” schematic of a working design using the P1 module (preferably in EAGLE or just a PDF)? It seems like the P1 has more pins than the P0, so I’d like to make sure my design is ok before sending it to the fab.

Thanks in advance!


The only missing piece is really a 3v3 power supply which you can see from - as reference :wink:

  • 3V3 power supply
  • MODE and RESET button

The reset pin needs to be pulled high too. right?
You may also need a mode button either on or off board.

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I have a P1 reference design schematic that I can publish… the layout is not done though. I just used it for the P1 datasheet images. @mohit also created a P1 reference design with all of the pins broken out to headers, but the nets are not named as D0-D7, A0-A5, etc…

I could PM you the one I made… I’d rather not distribute it unrouted, but the schematic is good.

@BDub, did @mohit post his design cause I’ll love a copy of his! Ok, and your’s as well :smiley:

@BDub Thanks a lot! This looks a lot like mine (as I referenced the P0/Photon design). Only other question I had was about the BTCX_* pins. What is their purpose and do they need to be attached to anything?

Thanks for all the help and quick replies, guys - I really appreciate it.

@ElementOrange hopefully this will help explain it a bit, and no you don’t have to hook it up at all if you don’t need it:

@BDub, could you also PM me the P1 schematic you made? I think mine is very very close but I am still missing the following:

  • What does the testmode pin do?
  • Which pin is used for the USB_DISC?

I would really appreciate your help.

@bing1106 please see the schematic included in the

P1 Datasheet

USB_DISC is automatically handled inside the STM32F205.
No need to hook up anything to testmode, it’s STM32 port pin PA8, which is defined as microcontroller clock output; capable of outputting a clock signal. I suppose you could use it as a GPIO if you needed an extra one.


@BDub thanks so much for putting this together! My design is now good to go!

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@BDub Thanks for the detailed datasheet! I did have one more question about the P1 in terms of board layout: Is it ok to leave the antenna portion of the P1 hanging off the side of a PCB (without any PCB underneath)? I see the land pattern for the P1 includes pads 74 and 75 - Do these need to be soldered down? I’m trying to save some board space…

Thanks in advance!

You’re welcome @ElementOrange :wink:

It’s a thin PCB and susceptible to being snapped off if not protected. If you are ok with that, then I’d say it’s probably ok to make a diving board :swimmer: out of it. I’d also be thinking about vibration, moisture and thermal affects. Probably a safe bet to stick the nickel worth of PCB under it for protection though.

Just to confirm, when looking at the schematic included in the P1 Datasheet

the capacitors and wiring shown in section 6.4 are required and need to be on an external board i.e. are not already on the P1 module?

@whyameye, good question! Perhaps @BDub can clarify :smile:

@whyameye i believe that is a yes. Take the P1 like another IC chip. External bypass/decoupling caps will be needed :smile:

Ok but it isn’t a chip, it’s a module, so I’d love some confirmation on this from @BDub @BDub1

That is correct, caps are required :wink:

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@BDub can you share the eagle files of p1 reference design? do you have schematic as well as layout?

In the meantime… There’s also one here:


thank you @kennethlimcp this one helps

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