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Dallas DS1820 - Forum Elektroniczne

Dallas DS1820

Zadaj tu pytanie, jeśli nie wiesz w jaki sposób zrobić układ realizujący założone funkcje.
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czarnikm
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Posty: 2
Rejestracja: pt 05 wrz 2003, 21:30
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Dallas DS1820

Postautor: czarnikm » pt 05 wrz 2003, 21:41


Andy
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Postautor: Andy » sob 06 wrz 2003, 13:43

Odpowiedź znajdziesz na stronie:


cyt.:
Architecture: The DS18S20 uses a bandgap temperature sensing architecture rather than the dual-oscillator architecture used by the DS1820. This architectural difference is invisible to the user.

Specification Differences: The primary specification difference between the two parts is the temperature conversion time: DS1820 = 500ms (max) and DS18S20 = 750ms (max).

Software Compatibility: The DS18S20 is software compatible with the DS1820 in most applications.

Hardware Compatibility: The DS18S20 is available in TO-92 (DS18S20) and 8-pin SOIC (DS18S20Z) packages. The DS18S20 (TO-92 package) replaces the DS1820 (PR35 package) since both packages are 3-pin packages with the same lead pitch. There is no replacement package for the DS1820S (16-pin SSOP); however, the DS18S20Z (8-pin SOIC) provides a smaller surface mount package option.

Artur P.
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DS1820 kontra DS18S20

Postautor: Artur P. » pn 08 wrz 2003, 13:02

Układy te nie są zamienne,bo bardzo istotnie różnią sie:
- rozdzielczoscią pomiaru temperatury(0.5 st.C i 0.125 st.C(chyba))
- sposobem zapisu w rejestrach zmierzonej temperatury.
polecam katalog producenta - Dallas Semiconductor.

Andy
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Postautor: Andy » pn 08 wrz 2003, 21:20

Drogi Arturze,
niestety wprowadzasz kolegę w błąd. Oba układy różnią się architekturą wewnętrzną czujnika temperatury, natomiast rozdzielczość jest taka sama (9 bitowa, dokładność 0.5 st. C) i taki sam jest sposób kodowania temperatury. (16 bitów, przy czym starszy bajt jest powielonym bitem znaku).
Jak podaje producent (patrz wyżej) różnią się one przede wszystkim czasem konwersji, a w większości zastosowań można je stosować zamiennie bez zmiany obsługi programowej.
Zatem zanim coś napiszesz, sprawdź to najpierw dokładnie, zamiast podawać nieprawdziwe informacje.

Jarik
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DS1820 kontra DS18S20

Postautor: Jarik » pn 15 wrz 2003, 16:58



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