Hi,
I'm working on a project that I wish to use the teensy 3.6 for, but as the board space is a bit tight, I'm rolling my own PCB.
I've made the PCB (4 layers) and used the QFP MK66FX1M0 rather than the BGA, I've got the QFN MKL02 bootloaders from PJRC and pretty much copied the Teensy 3.6 schematic (https://www.pjrc.com/teensy/schematic.html) though I've missed out a few parts that I don't need.
The board is running of it's own 5V supply, so no need for USB power. I have added a reset chip (STM1868) as previous experience has shown me that without one things don't always start as expected.
Here's the schematic;
And here's the board layout (i'm aware this doesn't show the link from pin 21 (VREGOUT) to the 3.3V, I added a link following reading the troubleshooting guide here - https://www.pjrc.com/store/ic_mkl02.html);
The Board is a 4 layer 1.6mm PCB, and I've kep all signals well away from the cyrstal.
The Main Crystal is a 16Mhz 6pF (Q24FA20H0005912), so I don't think that's the problem.
I have assumed (and this could be where I'm going wrong) that the bootloaders when purchased in chip form include the "blink" program (hence my LED).
I'd appreciate any advice, many thanks in advance.
Paula
I'm working on a project that I wish to use the teensy 3.6 for, but as the board space is a bit tight, I'm rolling my own PCB.
I've made the PCB (4 layers) and used the QFP MK66FX1M0 rather than the BGA, I've got the QFN MKL02 bootloaders from PJRC and pretty much copied the Teensy 3.6 schematic (https://www.pjrc.com/teensy/schematic.html) though I've missed out a few parts that I don't need.
The board is running of it's own 5V supply, so no need for USB power. I have added a reset chip (STM1868) as previous experience has shown me that without one things don't always start as expected.
Here's the schematic;
And here's the board layout (i'm aware this doesn't show the link from pin 21 (VREGOUT) to the 3.3V, I added a link following reading the troubleshooting guide here - https://www.pjrc.com/store/ic_mkl02.html);
The Board is a 4 layer 1.6mm PCB, and I've kep all signals well away from the cyrstal.
The Main Crystal is a 16Mhz 6pF (Q24FA20H0005912), so I don't think that's the problem.
I have assumed (and this could be where I'm going wrong) that the bootloaders when purchased in chip form include the "blink" program (hence my LED).
I'd appreciate any advice, many thanks in advance.
Paula
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