I finally sat down and corrected most of the errata from the 20140712 board and also made some small improvements. The highlights:
- the board is now 1 mm wider, to give the FPC on the OLED more room for bending, - the rfkill switch now switches VRF between VSYS and GND instead of acting as "syskill" by switching VSYS between VRF and GND, - removed copper from under the 32.768 kHz crystal, which happens to have a keep-out area there (I suspect that having missed this requirement is why the crystal on my board #2 doesn't oscillate), - found a nicer diode to prevent reverse current into VBUS (the one I used so far has fairly large leakage, but it's the best I have at home), and - added a small test pad to PTD1. This may become a battery sense input in the future. More about this later. The updated schematics: http://downloads.qi-hardware.com/people/werner/anelok/tmp/anelok-20150106.pdf The layout: http://downloads.qi-hardware.com/people/werner/anelok/tmp/anelok-20150106.png For comparison, the previous version is here: http://downloads.qi-hardware.com/people/werner/anelok/tmp/anelok-20140711.pdf http://downloads.qi-hardware.com/people/werner/anelok/tmp/anelok-20140712.png I still need to update the BOM. Also, the widening of the PCB still has to propagate into related material, such as the case design or the wire frame model with pop-ups. I don't plan to make any prototypes based on this design myself but Xiangfu has said he wants to make a few boards. Note that the widening of the PCB will also allow growing the touch sensor a little, and I have an idea for growing and at the same time simplifying it even further. The 20150106 design doesn't have this change since I still have to make a board (just the sub-board) and test whether this works as well as I hope. - Werner _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
