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Thread: Teensy 4.0 Schematics/eagle files?

  1. #1
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    Teensy 4.0 Schematics/eagle files?

    When will these be available on the site or github?

  2. #2
    Senior Member+ defragster's Avatar
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    Paul posted recently to a similar post - they are on his list of things to be done ASAP. It has been noted that his Schematic creation is manually created for usable detail - not just spit out from other software.

    https://forum.pjrc.com/threads/57112...l=1#post211727

  3. #3
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    awesome, i'll keep on waiting

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    Senior Member PaulStoffregen's Avatar
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    I'm drawing the schematic now. It's going to take a while...

    But here's the GPIO part. Hopefully no big surprises?

    Click image for larger version. 

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    hello
    good news for the i/o map
    have you a idea if it is possible to interface hard Qei in this case
    do you now where find exemple of Qei parameters
    thank you
    fabient

  6. #6
    Quote Originally Posted by PaulStoffregen View Post
    I'm drawing the schematic now. It's going to take a while...

    But here's the GPIO part. Hopefully no big surprises?

    Click image for larger version. 

Name:	schematic40_gpio.png 
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    Paul, it looks like you've got a typo there. B1_00 is tied to 7 and 8 on your diagram.

  7. #7
    Senior Member PaulStoffregen's Avatar
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    Opps, a typo indeed.

    Here's the completed schematic.



    Also on the schematics page:

    https://www.pjrc.com/teensy/schematic.html

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    Thanks! What’s the DMG2305UX’s function? I thought it might be to allow Ext Vin and the USB to power it at the same time but I it’s not set up that way.

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    Senior Member+ defragster's Avatar
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    Is that lowly switch on the mkl02 the famous Teensy *TM* Brickproofing Button?

    Valid assumption that those many extra mkl02 pins {versus T_3.x's} are somehow related to what might be a debug avenue once noted?

  10. #10
    Senior Member PaulStoffregen's Avatar
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    Quote Originally Posted by DaQue View Post
    What’s the DMG2305UX’s function?
    Reverse polarity protection

  11. #11
    Senior Member PaulStoffregen's Avatar
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    Added minor fixes to the schematic, for the Program pin and 3.3V & GND (right side of the board between On/Off & VTAB). Also added 10 of the 11 test points which were overlooked earlier.

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    I should have known that. Thanks

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    N12? not used, left floating?

  14. #14
    Senior Member PaulStoffregen's Avatar
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    Indeed, N12 (USB_OTG1_CHD_B) is floating. That open drain output pin would normally be used to integrate the USB charger detection to an external power management chip, presumably so it could know when to draw much more current. Sorry, Teensy 4.0 doesn't support that sort of external power management integration. The wakeup pin (L6) and standby request (L7) are also unconnected.

    PMIC_ON_REQ is connected to the 3.3V regulator enable, but that's the extent of Teensy 4.0's support for hardware power management. Trade offs had to be made to fit everything into the small size. Many other features (like native ethernet) that people wanted didn't make the cut either.

  15. #15
    Senior Member PaulStoffregen's Avatar
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    Quote Originally Posted by defragster View Post
    Valid assumption that those many extra mkl02 pins {versus T_3.x's} are somehow related to what might be a debug avenue once noted?
    Nope, not really. This new chip has several complex features which required extra pins. That's all.

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    you have N11 twice, I think you meant N14 on the VDD_ADC_3v3. Why didnt you just upload the schematic from your CAD software?

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    Quote Originally Posted by capt.asic View Post
    Why didnt you just upload the schematic from your CAD software?
    Maybe because he is not using a CAD SW?

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    I'm curious how you would build a custom board without using some form of software to design it

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    Quote Originally Posted by capt.asic View Post
    I'm curious how you would build a custom board without using some form of software to design it
    Have a look at https://forum.pjrc.com/threads/35253...l=1#post108451
    Conclusion, if you know your business post-it is all you need!

  20. #20
    Senior Member PaulStoffregen's Avatar
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    In this case, I upgraded from the usual post-it notes to a full letter-size sheet of paper with notes about each BGA pin. Even used Robin's collection of many different colored highlighter pens. She's a huge fan of color coding stuff. I usually don't bother, but this was a bigger project.

    Still, no CAD software for the schematic. Sure, a schematic is useful for communicating with others. But for just me, as 1 guy without anyone else on the engineering "team", CAD schematics just slow me down.

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    Senior Member+ MichaelMeissner's Avatar
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    Quote Originally Posted by WMXZ View Post
    Have a look at https://forum.pjrc.com/threads/35253...l=1#post108451
    Conclusion, if you know your business post-it is all you need!
    There is an urban legend that states Apple bought a Cray whatever to help design their next computers doing layout, etc. while Seymour Cray is said to have replied that he used his Apple Mac (or whatever was the current machine) to draw the diagrams, etc. to design the next Cray.

  22. #22
    Senior Member PaulStoffregen's Avatar
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    Quote Originally Posted by capt.asic View Post
    you have N11 twice, I think you meant N14 on the VDD_ADC_3v3.
    Yes, you're right. Thanks for noticing! I've updated the schematic.

    Also fixed the pins for the USB1 signals, which were off by 1 row.

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