On Sun, Aug 10, 2014 at 12:04 PM, Miguel Garcia gacuest@gmail.com wrote:
2014-08-10 10:52 GMT+02:00 Luke Kenneth Casson Leighton lkcl@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.
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