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https://www.tall-dog.com/uo_C_SE.html

Yeah, I stupidly looked past this aspect of the Teensy 3.2 schematic. I think I was thinking "I don't need the RTC or an external battery, so I'll just omit this" at the time.

I feel strange chatting here with only myself, but I'm still going to post in case this helps someone else! Today I connected the VBAT pin to 3.3V, and now the board/chip works perfectly with the existing firmware file. Problem solved.

And, of course, right after posting this, I discovered this thread: https://forum.pjrc.com/threads/27700 And, of course, my board left VBAT floating. Tomorrow I'll try connecting VBAT to 3.3V and see what happens, and report back.

Hi, I have an existing design that uses an integrated Teensy 3.2 module. It's also an open-source design, and so it relies on stock upstream firmware. Recently, for space-saving and ease-of-assembly reasons, I decided to try eliminating the Teensy module and putting a MK20DX256 chip and it's...

Yeah, but delays seem to be the normal these days... That's great! I so much appreciate your testing. SMD soldering is definitely not for everyone, so I'm very happy to have gone the pre-assembled route.

Thanks! :D

At long last: https://www.tindie.com/products/19936/ Don't forget to use the code PJRCFORUM25 to save 25 percent! Please accept my apologies for all the delays. First, the pandemic delayed SMD assembly in China significantly. Then it rendered my workshop and storage space here in the United...

Yes, and yes!

Yes, the first run of boards are being assembled now. The production time has been delayed because of the virus outbreak in China. The current estimate is that they'll be ready in about 30 days.

This is great to hear, Paul. I'm eagerly awaiting it! Thanks so much for the update.

That's true! I think that gives it capabilities on par with the J-Link EDU/BASE, if I remember correctly what I read about it a few weeks ago (which I probably don't).

Yeah, honestly they look great, but I was turned off by the fact that J-Flash software requires a J-Link PLUS at minimum, which is $600. I might pick up an EDU model to play with, but I'd be tempted to use it unethically and I'm not wild about that. The BASE is $200, still an order of magnitude...

I agree, and I plan to make some (of the things you mentioned) if this project works out well. My previous take on that was this: https://forum.pjrc.com/threads/52751 but the form-factor was never really satisfying for me, it just wasn't small enough. At that time I deliberately made it so I...

Yeah, I had the same thinking. Using the Teensy is great for development, and even for small runs of things, but it's not ideal to integrate into a product, due to space, headers, mounting, etc. And the BGA fanout makes dropping an RT1062 much more difficult than integrating an MK20 (Teensy 3.2)...

Thanks! I hope it ends up being viable for production use with or without the PJRC bootloader! If the LPC-Link2 works out, then we're talking about a $20 programmer and a <$50 programming fixture.

Thanks! I'm inclined to agree with you, except that I've really come around to the option of having the bootloader on-board. Obviously this variant won't actually be available for a while, until the PJRC bootloader is released. But in the meantime, the bootloader-less variant will be available...

Here are some some board and footprint drawings of the current design (units are mm): Timeframe for a beta is probably 6-8 weeks. The current revision is going to start being assembled in about one week, and should be done in a few more. Then it has to be shipped to me and finally I get to...

Here's an update! A new revision is all routed up and ready to go. I stuck with my previously-posted layout and overall size of 14.5 x 25.5 mm: Here's the current pinout: The bottom now has 11 small test pads for use with a pogo pin fixture: The fixture has a header for a SWD/JTAG...

Yes, this is very cool. I'm pretty sure at this point that the Teensy bootloader chip will be optional. I've just picked up an LPC-Link2 board (aka Embedded Artists EA-XPR-200, only costs $20) for future (hopefully successful) programming purposes.

Thanks! Perhaps you'd like to be a beta tester?

Nah, I'm not into selling stuff that I don't have on-hand yet. They'll go up on Tindie when they're actually ready to ship. Timeframe for assembly is ~1 month. In the meantime, if you're interested in buying a kit or an assembly, just shoot me a note and we'll arrange for something hand-soldered.

So, I think with USB, SD, and CAN all confirmed good, I'm about ready to pull the trigger on the first batch of kits. Any last-minute thoughts or feedback?

Awesome! :D Thanks

I've ordered them from PCBWay (pcbway.com) and ALLPCB (allpcb.com). At a quantity of 100 pcs, the latest batch was $0.68/pc from ALLPCB. They don't quote flex cables online, you have to email them. You can quote interactively online with PCBWay, but the pricing is very different. At this size...

Sure thing :)

This is great feedback so far! I'm glad everything seems to be working as it should be. Regarding the kits, I'm planning to have them come pre-assembled (soldered) with the following parts populated: C1 - 100uF SD card bypass cap C4 - 2.2uF TPS2055A input bypass cap C5 - 100uF TPS2055A output...

At the moment, it's just 100% solder mask (blank), no components. However, I might add (JTAG + power + USB) test points to facilitate programming with a pogo pin fixture.

So, I haven't tried re-routing this yet, but I do like the new layout and size. I removed the exposed pad on the QFN after doing some research (https://www.nxp.com/docs/en/engineering-bulletin/EB806.pdf, https://cache.freescale.com/files/analog/doc/app_note/AN1902.pdf). Without doing so, this...

This might be an ignorant response on my part, and this question may have already been discussed elsewhere, but... upon first glance: Wouldn't a momentary switch (going to GND) connected to the signal between the POR_B pin on the RT1062 and the PTB1 pin on the MKL02 trigger a manual system...

Well, I had a change of heart about this, for a few reasons, including those you mentioned. Mostly, the added complexity of using both modules together (T2M + a seperate bootloader board) and an end user needing to hook them up and route them properly, it just didn't seem worth the extra hassle...

Because they’re not yet capable of initializing an off-the-shelf i.MX RT1062. PJRC has a custom fixture to do it at the moment. Paul has said he is planning to update the bootloader code to support new chip initialization sometime next year.

I'm thinking of something like this for the bootloader board. This is 12 x 6 mm. The pads are a bit larger, 0.5 mm drills with a 1.5 mm pitch. This one could be easily made with the cheapest PCB tolerances too.

Thanks! :) I think you make a very good point here. They were another size/convenience compromise, but they take up too much space for the amount of convenience they provide (not much). I've removed them for now. I considered it, but now I'm re-considering it. At first, I imagined that the...

My local post office hardly ever scans packages, so the first scan will usually be from the sorting center in Springfield, MA a few days after they've been dropped off. It's annoying, but at this point I expect it.

I've been working on this as a tangent, and it's time for me to get some feedback (and help) if anyone is interested. Here goes. Note: This is not a finished/working project, but rather a work-in-progress. Background and rationalle The Teensy (especially the 4) is very powerful and can be...

Likewise! I'm happy that the latest beta boards to go out are timed nicely to be holiday presents :)

All the new boards (and parts, as requested) were shipped out today!

Yeah... so... this is why I need to stop ordering PCBs at 4 AM... Now that I see it, I know exactly why I made this mistake too! I think I'll keep the flex cable as-is and fix this on the breakout PCB, like this: Thanks guys. I'll send each of you a few new boards next week. Also, if you...

For what it's worth, the PCBs do (supposedly) go through electrical testing via automated flying probe machines at the board house, in order to weed out any defective ones before they're shipped.

Oh, you're lucky. We had one RadioShack here in western MA for a while. Then it closed and re-opened as BRW Electronics (I think that's what it was called?) which was only open for a year or two before closing. I don't even know where to buy regular solder locally if I run out. Did you do...

Thanks for the report, and I'm glad to hear that it mostly went well. I'm very curious to see photos of the socket issue, because I just assembled one with the socket kit and it went pretty smoothly. Now I'm going to go back and re-examine it closely. I know the exact spot you're talking about...

You're welcome! They're in-progress. I'm experimenting with Dozuki's free offering (think iFixit) for step-by-step instructions with photos. This happens to me all the time. And every time I think "I'll be more careful, so this never happens again" and then it always happens again. I think...

Yes, very much so! As you can see from the replies, it's in the second round of beta testing right now.

Hey Paul, thanks for the quick reply. Appreciate it! I'm very eagerly awaiting the updated bootloader for one of my projects.

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 i.MX RT1062 chip)? I assume that they do, since the Teensy 4.0 uses the very same bootloader chip...

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 on the underside of the Teensy. Just another little added guide. The cable should be easy enough...

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 too. The new part is Molex 1051620001 Also, I'm thinking about offering breakout kits with just...

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 Or changed to read: GPIO6_IO03 GPIO6_IO02 GPIO9_IO04 etc.

Got it. Thanks!