minimum full scale input voltage (V)??? with diferent resolution i need diferent range??? i didn't understood page 22 can anyone help me? :)
Roberto Spadim escreveu: > 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 >> >> ------------------------------------------------------------------------- >> Take Surveys. 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