[Arm-netbook] IC for analog and digital buttons (EOMA-68)

[Luke Kenneth Casson Leighton]

On Sun, Aug 10, 2014 at 12:04 PM, Miguel Garcia <gacuest at gmail.com> wrote:
> 2014-08-10 10:52 GMT+02:00 Luke Kenneth Casson Leighton <lkcl at lkcl.net>:
>>  if someone is buying a product with a $2 SoC then they can expect to
>> get what they pay for.  the software will have to be configured to
>> take into account that one of the interfaces is slower and e.g. ramp
>> down the WIFI speed.  or disable it.
>
> So we have 2 options:
>
> - Option A:
>
>    1st USB + 3.0 ----> USB Host 3.0

 plus 900mA power requirements (0.9A) which the AXP209 can't handle,
so you'll need to replace that (which means finding a suitable
replacement plus example circuit)

>    2nd USB ----> USB HUB -----> USB WIFI
>                                         -----> USB BT
>                                         -----> USB Audio
>                                         -----> USB STM32F072
>
>
> - Option B:
>
>   1st USB ---> FE 1.1 --> USB Host 2.0
>                                 --> USB WIFI
>                                 --> USB BT
>                                 --> USB Audio
>
>   2nd USB ---> STM32F072

 ... where you can use the AXP209, it can handle the 0.5A load for the
USB 2.0 Host, you have plenty of example circuits to use.

> -------------
>
> What should we use?
>
> Option A is the most complete, but if option B is the most compatible...

 take power requirements into consideration i think it's fairly clear
which option is most favourable.

> Thanks.
>
> _______________________________________________
> arm-netbook mailing list arm-netbook at lists.phcomp.co.uk
> http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook
> Send large attachments to arm-netbook at files.phcomp.co.uk