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What is the difference between DS18B20 and DS1820

Tessie Swift

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I am not clear the specific difference between these two chips. I have seen the 12-bit conversion method and the 9-bit conversion method in the data, assuming this is the internal selection method of the B20 (if it is, then what is the conversion between the two methods). 18B20 is 12-bit, 1820 is 9-bit, please give some advice who have used this chip, thank you!

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