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Thread: Smallest Form Factor Teensy 4.1

  1. #1
    Junior Member
    Join Date
    Aug 2020
    Posts
    4

    Smallest Form Factor Teensy 4.1

    Hey guys,

    I am looking into using the teensy (specifically the 4.1) ecosystem on a wearable application to achieve low latency high frequency data logging of various sensors (motion, environmental...). I was wondering if there is any open source design of "the smallest" form factor Teensy 4.1 with ideally an SD card slot (connected over SDIO). I found the micromod from sparkfun open source which can be a good starting point for a customized board...

    The reason I am asking is that I have done custom ESP32 boards in the past but never a complex MCU with BGA pads even more so. Therefore, I am not particularly aware of the critical considerations for designing a board and routing signals for such a dense mcu.

    Any tips or recommendations are welcome.
    Thanks in advance !

  2. #2
    Junior Member
    Join Date
    Oct 2016
    Posts
    13
    I think the smallest form factor for a Teensy 4.1 is a Teensy 4.0 with a SD Card connector soldered to the bottom side. The Teensy 4.0 is a very compact board. I don't see a custom board getting too much smaller. The MicroMod looks very small. But it is 22mm x 22mm, and it needs a little more room to be fitted into a connector, an SD card added, plus power regulator, usb connector, etc. the T4.0 is only 30% larger than the MicroMod, and might have almost everything you need on it.

    The connector I used for the SD card is a Digikey WM14405CT-ND. It has a 1.1mm pitch instead of the Teensy's 1.0 pitch. But it works.

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