Forum Rule: Always post complete source code & details to reproduce any issue!
Results 1 to 4 of 4

Thread: Custom teensy 3.2

  1. #1

    Custom teensy 3.2

    I have little experience with designing my own pcb's and so thought it would be good to get started by using the components and community support of the teensy. I have wired up the mk20 and linked the picture as I would greatly appreciate if anyone can give me general support for my projects.
    FYI; I haven't connected a USB yet but I have the resistors and pinout at the bottom. I am using the NCP551SN50T1G‎ voltage regulator for the battery input and the PMEG4010CPA,115‎ diode to connect both inputs to the chip, both found on digikey. Also I know I need a switch on pin 10 of the mkl02.
    Any feedback would be greatly appreciated, be as harsh as you like since I am very much new to this and am eager to learn.

    Questions of interest:
    Do you think this design is correct?
    Are the labelled pwm pins definitely all pwm?
    Have I correctly connected the sda and scl pins?
    Pin 50, why is it for both sck and LED? Can't you use both?

    Also any information on placing and routing these components on the board would be brilliant.
    Sorry for any inconvenience, I am new to this forum so let me know if this post is inappropriate or in the wrong forum etc.
    Thanks in advance,
    Sean
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	mk20 first design.PNG 
Views:	20 
Size:	32.9 KB 
ID:	21380  

  2. #2
    Senior Member PaulStoffregen's Avatar
    Join Date
    Nov 2012
    Posts
    22,513
    The VBAT pin on MK20 needs to be connected to 3.3V. That's one of the common issue mentioned on the MKL02 page (scroll down to "Troubleshooting")

    https://www.pjrc.com/store/ic_mkl02.html

  3. #3
    Senior Member
    Join Date
    May 2015
    Location
    USA
    Posts
    574
    I'd compare schematic/parts/layout to some of the publicly available designs. For example, https://gitlab.com/our-sci/reflectance-spec-PCB.

  4. #4
    Member
    Join Date
    Apr 2020
    Location
    Germany, NRW
    Posts
    86
    Shouldn't the crystals have some load capacitors nearby?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •