On 9/10/06, Xiaofan Chen <xiaofanc@gmail.com> wrote:
> On 9/9/06, M. Adam Davis <stienman@gmail.com> wrote:
> >
> > Nice low power 16 bit parts.  I consider them expensive, but I haven't
> > looked at the 2xxx parts yet, perhaps they've changed the pricing for
> > them.
> >
>
> The 2xxx parts are low end which might be target at what PICs and AVRs
> excel. They are really quite cheap with nice features.
>
> http://focus.ti.com/paramsearch/docs/parametricsearch.tsp?familyId=912&sectionId=95&tabId=1528&family=mcu&paramCriteria=no
>

After some studying of TI datasheets a user guide, I find out some
problems.

It seems to me that the 2xxx parts are somewhat quite limited in
terms of peripheral feature mix. For example, I want to find one
small MSP430 with both UART and SPI but it is simply not there.
I find that Silicon Labs C8051F33x a better option even though they
might be more expensive. Strangely Microchip also seems not
offering this kind of small parts.

The other problem is that the datasheet is really bad. For example,
I am reading the 2xxx family user guide (called x2xx by TI) and I
am trying to figure out the conversion speed of the 16bit ADC. The
formula given by TI is simply wrong. Then I looked at the other
family user guide, they are the same (just copy and paste).

http://www-s.ti.com/sc/psheets/slau144b/slau144b.pdf
(page 17-6).

If you follow the formula, it will give you a negative value. Oh, that is
fast! So TI is now investigating this and I am waiting for an answer.
Seem it is not so easy so I have waited for four days. I am thinking of
moving to Silicon Labs parts even though they are in general
more expensive.

Regards,
Xiaofan
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