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Hello, We designed a custom PCB around Teensy 4.0 and just found out that the W25Q16JVUXIM is not currently available anywhere (even brokers) and looks to be "not recommended for new designs". It doesn't look like the 64Mb version is available in the 2x3mm USON package. Does anyone know of...

No, reset is only cycling like this on a bad board. Attached is a scope shot. On a good board as soon as the bootloader releases reset it goes high and stays there. That's an interesting point about the oscillator not starting causing the MK66 to reset itself - I'll check deeper into that...

I've posted before about this but still haven't figured it out and have some new info. Quick recap, we've designed several of our own boards using Teensy 3.6 design and Arduino, mostly with no issues. One out of every 10 or 15 boards we make does not connect to Windows 10/Arduino right from...

I have removed it on a board that was exhibiting the problem and it didn't help, but there appears to be code in the MK66 that is continuously asserting the reset line (every 70us or so it briefly goes high then low again) and pressing the bootloader button does not reprogram the device or...

We've had the problem a couple more times and have had limited success by replacing the bootloader, but there must be something we have wrong in our hardware. I'm hoping to get Paul's opinion in particular on possible impact of our power supply monitor, TC51N2702, if it may be causing the...

I have one additional piece of info if anyone has any thoughts about it. Some time ago we were having a possible brown out issues with the 3.3V supply (it had an erratic ramp up) on a different board, so we added a Vcc monitor, the TC51N2702, to the reset line, which has a 2.7V trip point and...

Theremingenieu - Thanks, that crossed my mind too. But I think that if that were the case I wouldn't see the activity I do on the JTAG lines after pressing the button. Paul - Thanks as well for your response. I'm pretty sure the power supply is OK. It's a custom multi-stage supply (12V to 5V...

Hello, My first post here, but I have what sounds like a similar issue except with the MK66 and MKL04 bootloader. I know this thread is pretty old, but I was wondering if there was a resolution. I have the same situation where the MK66 is resetting itself continuously (70us in my case), but...