I made the first "complete" board version and populated it with some of the components. The bottom side of the board looks like this:
http://downloads.qi-hardware.com/people/werner/anelok/tmp/brd0-d1-bot.jpg >From left to right: - an improvised connection for in-circuit programming. Later on, this will be replaced by a "bed of nails" that connects directly to the test points. - battery and switch, not yet mounted. They're both huge and make soldering other things more difficult, so they'll go last. - the MCU - Micro USB AB. The connector looked intimidating because the signal pins are hidden under the shell, but turned out to be easy to solder. Not tested yet. I also didn't populate the ESD protection. - memory card holder. The geometry of this one needs checking. Some of the pins almost miss their pads. I think I managed to get everything connected, though. Not tested yet. - lanyard hole. The PCB around it looks quite fragile ... and it is, since that bridge that should be about 1 mm ended up being only some 0.5 mm. Have to tweak some milling parameters. In any case, this isn't supposed to be a load-bearing element. Here's the top side: http://downloads.qi-hardware.com/people/werner/anelok/tmp/brd0-d1-top.jpg At the bottom, one can see a Freescale FRDM-KL25Z that I use as programmer for now. On the Anelok, only two groups of components are populated: - the LED - transceiver with crystal. It can't do much without the actual RF parts (balun and a few caps) but this already allows me to check that the chip comes up and that the crystal oscillator works. I've written a few lines of test firmware to blink the LED: https://gitorious.org/anelok/anelok/source/fw The next steps are to add the boost converter and the rest of the power circuit (reverse polarity protection FET, memory card power gate FET, silo cap for RTC in deep sleep). But that's for another day :-) - Werner _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
