[Arm-netbook] IC for analog and digital buttons (EOMA-68)
Luke Kenneth Casson Leighton
lkcl at lkcl.net
Sun Aug 10 13:41:53 BST 2014
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.
> arm-netbook mailing list arm-netbook at lists.phcomp.co.uk
> Send large attachments to arm-netbook at files.phcomp.co.uk
More information about the arm-netbook