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Thread: Teensy 4.0 in a form factor with castellated edges

  1. #1
    Junior Member pkrobot's Avatar
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    Teensy 4.0 in a form factor with castellated edges

    I've used Teensy 4.0, and was really impressed with the capabilities. One suggestion that I have is to release it in a form factor with Castellated edges (Just like ESP32 modules from Espressive), with more GPIOs, but without the microUSB connector, or footprints for the SD card etc. Any connectors, including the usb connector, can be provided on a breakout board. That way, the module can be used in professional designs also. Is there a possibility of that happening?

  2. #2
    Senior Member+ Frank B's Avatar
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    I don't think so.
    A Teensy 4.1 is on the way, with Teensy 3.5/3.6 form factor.

    And what will you do without the USB? You can't program it without. Do you even own a Teensy?

  3. #3
    Junior Member pkrobot's Avatar
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    So far, I had only used Arduino for professional purposes where I needed to make a test fixture, and the real-time response time was not critical. And that too with Arduino Due (84MHz). Having used Teensy 4.0 in a prototype for a graphics acceleration engine for an industrial controller, I now believe that just the sheer power it packs makes it viable for use in non-critical subsystems of professional systems where quick deployment is required.

    I have already said that that USB, if required, could be put on a breakout board, or on the PCB the module is going to be put on. But normally, in production environment, you don’t use in-circuit programming, and have the microcontroller preprogrammed by the vendor, or the reseller (just like PJRC sells a preprogrammed boot loader chip), before it is populated/ soldered on the PCB. Alternatively, the final developed firmware image could be programmed through JTAG or SWD/SWO interface directly onto the M7 chip, if this is desired post production.

    In its current form factor, it is not suitable for mass production, in case the product becomes successful, since you’ll have to use through-hole soldering, since that increases cost. As a castellated edged module, the soldering can be automated along with other components. Ideally, I’d have the components in the Teensy 4.0 BOM soldered directly to the main PCB, but that increases costs, since most of the inexpensive assembly facilities in China do not do BGA population. Quick turnaround/ reduced design time, and lower cost is the key here, especially for consumer items. That’s why I asked if such a module is on PJRC’s roadmap.

    I personally think a castellated edged module is a good idea, and has a business case. But that’s just me.....

    -pk

  4. #4
    Senior Member+ defragster's Avatar
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    an outside work in progress has been posted - no doubt there is a usage case for it - talldog on tindie is @loglow here

  5. #5
    Junior Member pkrobot's Avatar
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    Something similar to the following:

    https://shop.idlehandsdev.com/produc...14201763463268

  6. #6
    Senior Member+ defragster's Avatar
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    Quote Originally Posted by pkrobot View Post
    Something similar to the following:

    https://shop.idlehandsdev.com/produc...14201763463268
    Understood - that is what @loglow is working on producing … there is a thread with status and images I haven't followed recently.

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