anelok: new and enhanced Y-Box (draft)

Felix sucotronic at gmail.com
Thu Jan 16 10:37:01 EST 2014


Wow, I feel lost at some point. I though that the Y-Box will be used to
connect anelok to pc, but now it's like an independent wireless proxy, no?


On Thu, Jan 16, 2014 at 3:59 PM, Werner Almesberger
<werner at almesberger.net>wrote:

> I've prepared a draft of the design of the new and greatly enhanced
> Y-Box. Schematics:
>
>
> http://downloads.qi-hardware.com/people/werner/anelok/tmp/ybox-draft-20140116.pdf
>
> Layout:
>
>
> http://downloads.qi-hardware.com/people/werner/anelok/tmp/ybox-draft-20140116.png
>
>
> Changes from the old version:
>
> - added KL25 (for USB) and CC2543 (BTLE-capable RF SoC)
>
> - PCB is now 45.1 x 21.6 mm = 974 mm^2 (up from 30.0 x 18.5 mm =
>   555 mm^2)
>
> - slot-mounted USB A receptacle should reduce overall case height by
>   about 4 mm
>
>
> General features:
>
> - Freescale KL25 with 48 MHz ARM Cortex M0+, 128 kB Flash, 16 kB RAM,
>   basically the same chip as in Anelok, but in a smaller package
>   (32-QFN instead of 48-QFN) (1)
>
> - TI CC2543 with (I think) 32 MHz 8051 core, 32 kB Flash, 1 kB SRAM,
>   and a 2.4 GHz transceiver that's assumed (2) to be BTLE-capable
>
> - general layout (see the layout image, link above, for details):
>
>   12 o'clock: PC-facing USB Micro B port. PC provides power to Y-Box
>   and all that is attached. PC accesses the KL25 for RF communication.
>   (3)
>
>   3 o'clock: device-facing USB A (full-size) receptacle. Device
>   receives power from PC.
>
>   6 o'clock: Anelok-facing USB Micro B port. Anelok receives power
>   from the PC and acts - through the Y-Box - as USB host for the
>   device in the USB A receptacle.
>
>   9 o'clock: antenna.
>
> - two brightness-matched LEDs (green for the KL25 and red-orange for
>   RF) on PWM-capable I/O pins
>
> - 5 general-purpose test pads on the KL25, 2 on the CC2543. Pads are
>   2 mm and each group (4+1+2) is placed with 1.2 mm spacing (which is
>   roughly the spacing of ribbon cables)
>
> - large test pads on the bottom with >= 4 mm center-to-center spacing
>   give access to power and in-circuit programming interfaces of both
>   chips. (4)
>
> - KL25 has access to in-circuit programming signals of the RF SoC
>
> - single-crystal design: the RF SoC has the crystal and provides a
>   precision clock (required for USB) to the KL25. (5)
>
> (1) May switch to a KL24/KL25/KL26 with smaller memories in the final
>     product. The "big" chip is for development.
>
> (2) The chip is not marketed as BTLE-capable but its capabilities
>     suggest that it can be used for it. Some low-level functionality
>     that is usually done in hardware, e.g., whitening, may have to
>     be done by software.
>
> (3) If all we need is power, the "PC" can be any USB power source.
>
> (4) To be used for a yet-to-be-designed "bed of nails" production
>     programming device.
>
> (5) Since the CC2543 may have bad firmware, we cannot rely on it to
>     provide the clock on its own. Therefore, the idea is that the
>     DFU boot loader in the KL25 will reset the CC2543 and put it in
>     debug mode, then command it to output the clock, enumerate, wait
>     briefly for "emergency repair" DFU activity, and then jump to
>     the application which can release/reboot the CC2543.
>
>
> Since the Y-Box is now considerably more complex than before, I've
> given it its own repository:
>
> https://gitorious.org/anelok/ybox
>
> The analok/ybox repository should be placed at the same level in the
> directory hierarchy as the anlok/anelok repository (and all the
> Qi-Hardware repos we use.)
>
>
> I plan to make a first board during the next week, so there is still
> plenty of time to review schematics and layout.
>
> After that the firmware has to be written (both for KL25 and CC2543)
> and finally the case design will have to be adapted, too. Once
> correct operation of the Y-Box is verified, Anelok will switch to the
> CC2543 (along with its firmware), too.
>
> Comments ?
>
> - Werner
>
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-- 
Felix
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