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Pull up voltages #1
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This is just a retrace showing exactly what I found on my board after removing all components, and a transparent overlay showing both sides. Don't rely on the following, but if I recall correctly from over 3 months ago... The chip itself has the internal weak pull up resistors. Read the datasheet to confirm this. The chip is supplied at 5 volts. If you want a proper 3v3 setup the chip should be powered from 3v3. If you study the included images here, you should clearly see that the 3v3 rail passes right beside the trace going to VCC on the chip. Use the pictures to figure out where you have access and want to cut the trace that powers the chip and add a bodge wire to connect this trace to the 3v3 rail. Use this: |
Is it possible to show the pull up voltages on the tracing? I have heard that the MISO an other lines are still 5V on some models where they should be 3.3v. Is there a way to confirm with your schematic what they are?
I have seen ways to convert this to real 3.3v, can we get 3 diagrams 1.(as is) 2.modified for 3.3v only 3. modified for 5v only.
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