does DS2450 an 16bit ad??? or just 16bit ad with 0-5 range? and 8bit
with 0-2.5 range?
i didn't understand, cause in datasheet is write:
User programmable input range (2.56V, 5.12V), resolution (1 to 16
bits) and alarm thresholds
Overdrive mode boosts communication speed to 142k bits per second
Channels not used as analog input can serve as open drain digital
outputs for closed-loop control
The DS2450 1-Wire® Quad A/D Converter is based on a
*successive-approximation* analog to digital converter with a four to
one analog multiplexer. Each input channel has its *own* register set to
store the input *voltage range, resolution*, and alarm threshold values
if i want an AD just like an PIC16f877 that have 8 AD with 0-5V range
and 10bits, but i need at lest 4 AD i don't need 8 can i buy ds2450 or
have another better choise? i like ds2450 cause it's 16bits (in
datasheet) but i didn't tested yet (they are smd and i didn't put it on
circuit, yet)
but reading the datasheet... it can be from 1 to 16 bits AD, i'm right?
is it like ds18b20 with 9,10,11,12 bits temperature resolution?
well, i will put it on circuit and put on bus to see what owserver see
i will think about an circuit for RTD too i'm not very good with
eletronic, but my father is a phd :)
he can make the circuit to me
and i make the software work for he :)
bye guys
Paul Alfille escreveu:
> Roberto,
>
> If you are mainly interested in a switch, the DS2408 has 8 switches
> and is fully supported.
> If you are interested in thermocouples, the DS27xx family (DS2751
> DS2755/6 DS2760/1/2 DS2770 DS2780/1) all have temperature, switch, and
> thermocouple support built in with known (and commercially available)
> circuits.
> The real function of the DS2450 is its voltage sening -- 4 channels.
> Not terribly accurate (8 bits despite what the datasheet says), but
> the 0-5V range is nice. Many of the battery chips (DS2438, and DS27xx)
> have accurate voltage channels, but with more constrained ranges (
> e.g. 3-10V).
>
> With the DS18xx and DS2436/8 and DS27xx all measuring temperature (and
> thermocrons, humidicrons), it's hard to see the utility of another
> temperature system. Nevertheless, if you build a working circuit and
> publish the system, I put in support.
>
> Paul Alfille
>
> On 9/26/06, *Roberto Spadim* <[EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>> wrote:
>
> Hello guys i was buying ds2405 for input and output, today i bought an
> ds2450 for tests.. and it have 4 input and 4 output :D for a cost
> of 24$
> versus 9$ so 4 ds2405 would cost 36$
> ok
> the question...
> now that i will only buy ds2450 :) i want to use ds2450 for some
> others
> things...
>
> could we build an PT100 or PT1000 termometer with ds2450???
> http://en.wikipedia.org/wiki/Resistance_temperature_detector
>
> we could set it for 2, 3 or 4 wires and they could be put in ad0, ad1,
> ad2, ad3 respectively
> so with this we could make some files in ds2450.c :)
>
> like temperature9 temperature10 temperature11 temperature12 for
> ds1820.c
>
> we could implement and
> RTD_PT100_2wire
> RTD_PT100_3wire
> RTD_PT100_4wire
> RTD_PT1000_2wire
> RTD_PT1000_3wire
> RTD_PT1000_4wire
>
> for ds2450.c
> what do you think?
> putting it on ds2450.c could help some owphp, owperl,owtcl clients to
> avoid uplevel programming language and put an lower level to ds2450.c
> and... make an new "sensor" for owfs :D
> we can't use thermocouples cause we need coldjuction temperature,
> so we
> can use PT100 or PT1000 to get temperature :D, we could build and
> default pcb project, put it on owfs website for anyone that want
> an RTD
> sensor :)
>
> i'm thinking on use they for my kitchen in my beach house :D
> if we use 3 wires, PIO3 will be an switch to turn off my stove
> after 30
> minutes :D
>
> good bye guys, i didn't understood how to get volts in ds2450.c if i
> could i would make like i told in ds1820.c
> see you later ;) bye
>
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