[Arm-netbook] flying squirrel 7in tablet: 2nd PCB layout attempt

[Ken Phillis Jr]

On Fri, Jan 18, 2013 at 4:28 AM, luke.leighton <luke.leighton at gmail.com> wrote:
> On Fri, Jan 18, 2013 at 3:54 AM, Ken Phillis Jr <kphillisjr at gmail.com> wrote:
>> I can actually think of two main things that should probably be
>> addressed with a tablet...
>>
>>
>> 1) Will the tablet be able to charge to full power using a
>> standardized USB Micro-B connector found on many smart phones ( and
>> the raspberry pi )
>
>  there will be *two* USB-OTG Micro AB connectors.  one can power the
> CPU Card (independently), the other can be used to charge the battery
> *and* also power the device whilst operational.  charging via the
> USB-OTG whilst operating the screen and everything would be very very
> slow, it would be better for it to be switched off and charged that
> way.
>
>  this is because we're using a 2nd AXP209, it's got all the
> functionality built-in
>
>  there will also be a 5V input (again, courtesy of the AXP209)
>
>

This is actually really good to know, and it shouldn't be too much to
expect reasonable charge time if the device is in use where the wifi
is turned off, and the active use for the device is reading an ebook.
Although, it's also possible that the person will most likely be
making use of the video decoders to decode a video from the sdcard. I
would personally like to have decent playback using xbmc.


As for the actual power source, I'm guessing that the power source
will be any standard 5v that can provide about 1amp should be more
than enough.


>> 2) If that's not possible, will the device be explicitly tested to
>> make sure that the device can handle being dropped on with the power
>> connector in use from about 2.5 feet? I know that this is not exactly
>> a common occurrence, but it is something that can actually pose a
>> problem especially if the device is made unusable by said fault.
>
>  i think anything that's dropped like that, esp. with connectors
> plugged in, all bets are off.  we are however considering putting the
> power plug and headphones onto a separate 25x25mm 2-layer PCB, for
> ease of repair. it's not however something that would exactly count as
> a warranty repair: you drop it and break it, you pay for it.  we can
> however look at doing a much more expensive rugged tablet, later.
>
>  l.
>

Normally I would agree, but the falling risk is actually something
that is a high risk for tablets of this type especially when the
tablets are used to read books at night like a kindle. The only reason
the kindle doesn't break as often is that the kindle based devices
have extremely long battery life that can be anywhere from 10 days to
30 days.