2014-08-07 19:57 GMT+02:00 Luke Kenneth Casson Leighton <lkcl@lkcl.net>:

On Thu, Aug 7, 2014 at 6:21 PM, Miguel Garcia <gacuest@gmail.com> wrote:
> 2014-08-07 18:04 GMT+02:00 Luke Kenneth Casson Leighton <lkcl@lkcl.net>:
>> woo! $2 in 10k volumes, and there's a 7x7mm UFBGA variant.
>
> So I suppose we should use STM32F072VBH6, is that correct?

looks like it. more modern than the STM32F103 (which only has USB
1.1) and lower-cost too.

Is there a smaller one in the same family we could use? Such as the STM32F072'C' or 'R', which have 37 and 51 GPIOs respectively and nearly the same number of ADCs as the bigger 'V' variant. I suppose it'd make PCB design/routing easier, since the number of pins and the dimensions of the IC roughly double between the 'C' and the non-BGA 'V' variants. I don't know if there are any disadvantages to using the smaller ones though.