Sorry. I oppologize profusly :-) I've been living with this stuff for a number of years and it is easy to forget how confusing the TI manuals are...
more below. On Wed, Dec 4, 2013 at 10:25 PM, Alaios <[email protected]> wrote: > Hi > as manual I guess you mean this one > > http://www.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=slas368g > No that is the data sheet. Which you should also have handy and refer to often. That describes the actual implementation of one of the members (actually a group of like chips that are very close to each other). All of the chips that make up a given family are described by the User's Guide which I keep referring to as "The Manual" Sorry about that too, I should be more specific. If you look at the front page of datasheet (which you reference above as SLAS368g, SLAS368 is the lit number and G is the revision), you will see... For Complete Module Descriptions, See the MSP430x1xx Family User’s Guide, Literature Number SLAU049 You do indeed want SLAU049, actually the current version is SLAU049F<http://www.ti.com/lit/ug/slau049f/slau049f.pdf>, note I stuffed the pointer too). And in particular you want to read Chapter 17, ADC12. The TelosB uses the msp430f1611 which includes an ADC12, not to be confused with the ADC10. > > at page 42. It would be easier for me to apprehend it if there was more > text there. I still luck all this low level understanding but somehow I > will make it. > Just wait till you try to make sense of the TinyOS ADC code :-). But it starts with getting a good understanding of what you have to work with, ie. the basic h/w. Just wait until you start to do full scale system design where you get to make it all up. :-) Lots of fun. > > Regards > A > > > > On Wednesday, December 4, 2013 10:40 AM, Eric Decker <[email protected]> > wrote: > > > > On Tue, Dec 3, 2013 at 10:05 PM, Alaios <[email protected]> wrote: > > Hi all, > I am using telosb with msp430 processor. If I understood it right the ADC > channels can be set to work with either 1.5 or 2.5Volts maximum. > > > Like I said you need to read the user manual. > > The 1611 provides an internal voltage reference of 1.5V or 2.5V. But you > can also use an external reference voltage. > > If you need 3.3 or 3.0 voltages as input then you need to provide an > external voltage reference and then need to program the ADC > h/w appropriately. The ADC inputs can be driven from 0-AVCC which > typically is the same as the digital VCC and they get tied together. > > If you can work with 2.5 volts then you can use the internal reference. > > > Seriously, read the manual. > > > > > ADC is 12 bits so any voltage between 0 and maximum voltage would be > mapped to these 12bits. I will need later to do the maths and see if that > can give me mV resolution that the sensor needs. > > Regards > Alex > > > > On Wednesday, December 4, 2013 4:49 AM, Eric Decker <[email protected]> > wrote: > > The MDA300CA that Bipin mentions in its data sheet that the ADC inputs are > 0-2.5 V so don't know if that works for your application. > > The telosb has a few ADC ports brought out to the expansion connector at > U2. I beleive you can use those for 0-3V. > > you should look at the manual for the msp430f1611 mcu. > > > > On Tue, Dec 3, 2013 at 12:04 AM, Alaios <[email protected]> wrote: > > Dear all, > I am practicing on connecting external sensors on a telosb or micaz > sensors and I need a bit of your experience. > > One of the sensors I found on the market, that I would like to try, can > work with 3Vdc (which I think is supported by telosb). > > The pressure reading would be returned of voltage values ranging from 0 to > 3 Volts. > Which are the interfaces that can "understand" voltage values? > > I would like to thank you in advance for your reply > > Regards > Alex > > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > > > -- > Eric B. Decker > Senior (over 50 :-) Researcher > > > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > > > > -- > Eric B. Decker > Senior (over 50 :-) Researcher > > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > -- Eric B. Decker Senior (over 50 :-) Researcher
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