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

[krasi gichev]

Update - it is written at line 1 at page 1 of the datasheet "ARM-based
32-bit MCU, up to 128 KB Flash, *crystal-less* USB
 FS 2.0, CAN, 12 timers, ADC, DAC & comm. interfaces, 2.0 - 3.6 V" - so it
should do clock recovery from USB data stream.

Another note (if you go this way) - this chip has two I2C controllers - so
you could "spread" the sensors on both of them to get better throughput.
Just take care to estimate the data rate of each one of them so make a good
balance.


2014-08-07 17:42 GMT+03:00 krasi gichev <krasimirr at gmail.com>:

> Wow, this is 100 pins ... sure it has everything you need (and a lot of
> things that you don't need). But is 14mm square, I hope you have enough
> board space.
> Check this link for reference - you can use design files of this eval
> board for quick start:
> http://www.st.com/web/en/catalog/tools/FM116/SC959/SS1532/PF259717
>
> There is a claim in the datasheet: "Internal 48 MHz oscillator with
> automatic trimming based on ext. synchronization" - not sure but I suspect
> that this would be a good option if used on USB - no need for clock crystal
> for the STM32.
>
>
> 2014-08-07 17:29 GMT+03:00 Miguel Garcia <gacuest at gmail.com>:
>
> 2014-08-07 16:23 GMT+02:00 krasi gichev <krasimirr at gmail.com>:
>> > Yep, 071 is good if host connection is either I2C or SPI. There are 2
>> I2C
>> > controllers so it can run as gateway.
>> > But for USB there is STM32F072CBT6 - at Digikey it is priced at 2.37USD
>> for
>> > 1000pcs -
>> >
>> http://www.digikey.com/product-detail/en/STM32F072CBT6/497-14645-ND/4815292
>> .
>> > This one is in 48 pin. If more pins are needed, just switch to:
>> > STM32F072RBT6 -
>> > http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1574/LN1823/PF259605
>>
>> And this: http://www.digikey.com/product-search/en?KeyWords=STM32F072VBT6
>> ??
>>
>> Thanks.
>>
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>
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