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    Hey Paul, thanks for the quick reply. Appreciate...

    Hey Paul, thanks for the quick reply. Appreciate it!

    I'm very eagerly awaiting the updated bootloader for one of my projects.
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    Teensy 4.0 Bootloader Chip Question

    Hi there,

    I'm wondering if the Bootloader Chips for sale on the PJRC store (part number IC_MKL02Z32_QFN16, https://www.pjrc.com/store/ic_mkl02.html) support booting the Teensy 4.0 (aka the NXP...
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    Yeah, it'll be interesting to see how this one...

    Yeah, it'll be interesting to see how this one goes.

    You'll notice that I added two white line markings onto this version of the flex cable. They're designed to align with the existing white lines...
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    I changed the SD card socket. I have a feeling...

    I changed the SD card socket. I have a feeling that some of you are going to be very happy about this.

    The new one doesn't have any overhang, so it should be much easier to solder. It's slimmer...
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    Thanks, this is great. So, what's your opinion...

    Thanks, this is great.

    So, what's your opinion about the ALT5 column in the PIN MUX table then?

    Should it be left as-is:

    GPIO1_IO03
    GPIO1_IO02
    GPIO4_IO04
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    Got it. Thanks!

    Got it. Thanks!
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    Adobe Illustrator :)

    Adobe Illustrator :)
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    An updated pinout card for the new revision. ...

    An updated pinout card for the new revision.

    PDF: 18205
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    PM'd both of you. Thanks! You won't have to...

    PM'd both of you. Thanks!

    You won't have to order any parts. They'll be included :D
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    I think it will be easiest to solder the SD...

    I think it will be easiest to solder the SD socket first, but it will also be easier now that the pads are longer too. I'm going to do some experimenting. This round will have step-by-step assembly...
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    With the re-ordered USB host pins and the added...

    With the re-ordered USB host pins and the added second (USB host power) switch:
    18198 18199
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    Yikes! I totally forgot about this. Now I...

    Yikes! I totally forgot about this. Now I remember why those two GND pins were next to each other. I've put them back in order.



    The TPS2055A does have an EN pin, and I just had it connected to...
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    Ok! So, in preparation for ordering a new...

    Ok!

    So, in preparation for ordering a new batch, I made some more changes:


    Replaced the TPD3S014 chip with the TPS2055A chip, as requested, which is larger and should be easier to solder.
    ...
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    Sounds great, thanks very much!

    Sounds great, thanks very much!
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    Sounds great! Yes, I'll include a socket kit too....

    Sounds great! Yes, I'll include a socket kit too.



    Probably not, since the previous A3 revisions were never manufactured. This will stay at A3 until fab'd.



    Great to hear!
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    I'm not sure about this change, and even less...

    I'm not sure about this change, and even less sure after reading the response by @KurtE ...



    This is a great suggestion, and I've updated the chart!

    PDF: 18193

    Low-res raster preview...
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    Hi there everyone! Sorry for the extended time...

    Hi there everyone! Sorry for the extended time away. My life got very busy for a moment there. I haven't forgotten about this project though, and I think we're getting very close to a release!
    ...
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    Hi everyone, I haven't been nearly as...

    Hi everyone,

    I haven't been nearly as responsive here as I'd like to be, since I've had a lot going on over the last several weeks, some of which was unexpected.

    I'll be on a train with Wi-Fi...
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    Hi all, Iím sorry for my silence this past week,...

    Hi all, Iím sorry for my silence this past week, Iíve been extraordinarily busy. Iíll try to catch up with everyone on here tonight.
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    Hey all! You guys are awesome. Got home...

    Hey all!

    You guys are awesome.

    Got home safely, but then had a crazy busy weekend.

    Looks like I have some work to do!

    I should be able to make revisions this week. I might hold off on...
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    Wow, thanks everyone for all the detailed tests...

    Wow, thanks everyone for all the detailed tests and replies here!

    Just wanted to pop in and say that I'm away from home until late on Wednesday (9/18) so I won't be able to ship anything else out...
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    How do folks feel about this kind of battery...

    How do folks feel about this kind of battery holder?

    17567

    Only works with 1220 (and maybe 1225) cells, but that's the most common thickness anyway.

    Examples:

    MPD BC501SM
    Keystone 1056
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    My technique with these has been: apply flux,...

    My technique with these has been: apply flux, place component, tape it down if necessary (I usually don't), heat up it tip of one pad without touching the header, then apply some solder to the pad...
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    I agree. The most difficult thing for me is the...

    I agree. The most difficult thing for me is the SD socket because of its little overhang. I'm excited to investigate the possibility of the "removable" cover, because that alone could remedy this....
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    I have Socket Kits put together now. Happy to...

    I have Socket Kits put together now. Happy to send you one! That goes for anyone else beta testing too. Let me know if you'd like a Socket Kit and/or another Breakout kit along with it.



    This...
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    I don't think the (stated) 0.43 mm difference...

    I don't think the (stated) 0.43 mm difference would matter in practice, and I suspect that the same pogo pins would still work too.

    Keep in mind that to fully socket the Teensy (3.6 or 4.0) you'd...
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    I order these headers directly from Samtec. Their...

    I order these headers directly from Samtec. Their online ordering is fine overall, but very annoying when it comes to shipping costs since it doesn't calculate them for you, so you just have to...
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    The back of the pinout card will have the...

    The back of the pinout card will have the dimensional drawing on it.

    The mux table will be printed on legal size paper (8.5 x 14) so will be easy to read.
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    Here's a revised pinout card: Added CS1 to...

    Here's a revised pinout card:

    Added CS1 to pin 0
    Added MISO1 to pin 1
    Reduced the size of the gray digital pin number bubbles
    Rearranged the blue & green bubbles on the left side
    Swapped...
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    Ok, this is a bit of a tangent, but... I made...

    Ok, this is a bit of a tangent, but...

    I made a pin mux table based on section 9.1.1 (pages 289-316) of the i.MX RT1060 Processor Reference Manual.

    i.MX RT1060 Pin Mux Table
    CSV (zipped):...
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    Dis you mean will the back of the card have...

    Dis you mean will the back of the card have anything on it? I wasn't planning on it. Anything useful you'd like to see there?
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    I don't know yet. I still have to get my hands on...

    I don't know yet. I still have to get my hands on one of those pressure fit connectors to test it with the flex cable. The datasheet indicates a recommended thickness of 3.0 Ī 0.05 mm and the flex...
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    So, I cross-referenced my pinout card with the...

    So, I cross-referenced my pinout card with the data from @KurtE, and this is the result:

    17443

    Light red background = Not currently included on pinout card
    Red text = Alternate pin for this...
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    Thanks for the feedback everyone! I don't...

    Thanks for the feedback everyone!

    I don't think I'm going to send out any of the first run (mistake) boards, just because I don't want to cause any unnecessary confusion (for myself or anyone...
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    The basic kit will include totally generic...

    The basic kit will include totally generic tin-plated square-post header strips.

    The ones pictured here, which will be included in the optional Socket Kit, are Samtec low-profile socket strips...
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    The assembled (socketed) breakout without Teensy:...

    The assembled (socketed) breakout without Teensy:
    17416

    The assembly showing flex cable and socket (the locking tab is flipped up in the left photo):
    17415 17414

    The Teensy by itself with...
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    Here's an update! I got the first batch of...

    Here's an update!

    I got the first batch of test boards back. The flex cables look good, and seem to work fine, both in terms of direct soldering, or when used with a connector socket. They are...
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    PM sent. Yes, there certainly will be a...

    PM sent.



    Yes, there certainly will be a pre-assembled option!
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    Cool, just sent you a PM.

    Cool, just sent you a PM.
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    For the basic breakout kit, the flex cable would...

    For the basic breakout kit, the flex cable would actually be intended to be soldered on both ends. The connector part would be included with a separate socket kit. I don't think there's any reason to...
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    Latest revision. This is likely to be the first...

    Latest revision. This is likely to be the first limited pre-production run of boards and cables:


    Modified flex cable shape for better clearance around the VUSB pin header.
    Routed all traces...
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    Thanks! PM sent. Thanks! I just sent KurtE...

    Thanks! PM sent.



    Thanks! I just sent KurtE a PM too.
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    Don't know what happened there, but I resent it....

    Don't know what happened there, but I resent it.



    PM sent.



    No prob. Let me know if things settle down and you'd like to hop in!
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    Just sent you guys private messages to follow up...

    Just sent you guys private messages to follow up about this.
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    If I were to make a few pre-release breakout...

    If I were to make a few pre-release breakout boards, are there some folks who'd be interested in putting the USB host port through some rigorous testing? Shipped out free, of course. Let me know and...
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    Some updates: 17206 17208 Added SD...

    Some updates:

    17206

    17208


    Added SD card bypass cap pads, moved SD socket a little.
    Removed redundant 3V3 and GND pads from Teensy footprint.
    Added ON button pads, moved VUSB-VIN...
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    Based on the feedback already received, you can...

    Based on the feedback already received, you can see a revised pin layout on the breakout image below. VHST would be the output from a TPD3S014. Not entirely sure how I'll handle this as a kit yet...
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    Soldering a 1 mm pitch flex cable should be ok. I...

    Soldering a 1 mm pitch flex cable should be ok. I think. I'm excited to try, at least.

    The cost isn't too bad. It's looking like roughly $0.50 per flex board. The connectors are comparable to...
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    I think this is totally reasonable, and I'll...

    I think this is totally reasonable, and I'll probably make this change for these reasons.



    Good catch. Not a huge deal, but there's an easy solution: I'll move ON and PG over to the same side...
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    Are you talking about the D+, D-, etc. pins in...

    Are you talking about the D+, D-, etc. pins in the lower-left of the top image? I could see about rearranging these to match the 5-pin order. Since there are several extra GNDs, there's room for it....
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