What's more fun than building something ? Right, taking it apart ! So here comes the Mk 3 prototype teardown:
Step 1: look at what's under the hood http://downloads.qi-hardware.com/people/werner/anelok/tmp/mk3-running/teardown-top.jpg If I had already made the display cover, which will be glued to the case, one would have to detach it first. In this prototype, one can just pop out the OLED. The sMCU is in the upper right corner, the cMCU in the lower right corner. On the left side of the bottom edge one can see the USB detection and power selection logic. Step 2: remove the two screws that hold the bottom plate http://downloads.qi-hardware.com/people/werner/anelok/tmp/mk3-running/teardown-screws.jpg Step 3: remove the bottom plate http://downloads.qi-hardware.com/people/werner/anelok/tmp/mk3-running/teardown-mid.jpg We get to see the battery and the middle plate. The design of the latter isn't finished yet - I just picked one that more or less fits off my junk pile. The USB opening looks a little large. I'll explain why in the third part. Step 4: remove the memory card and pry out the middle plate http://downloads.qi-hardware.com/people/werner/anelok/tmp/mk3-running/teardown-bottom2.jpg Next to the battery is the boost converter circuit with its large inductor. "South" of the boost converteris the BTLE chip (nRF51822), with balun, capacitors, and crystals. The load switch for card and display power is between RF and the card holder. Between memory card and USB connector, there are only a few ESD protection components, which I've omitted in the prototype. Coming next: errata. - Werner _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
