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Each DS18S20 contains a unique 64-bit code (see Figure 6) stored in ROM. The least significant 8 bits of the ROM code contain the DS18S20's l-wire family code: 10h. The next 48 bits contain a unique serial number. The most significant 8 bits contain a cyclic redundancy check (CRC) byte that is calculated from the first 56 bits ofthe ROM code. A detailed explanation of the CRC bits is provided in the CRC GENERATION section. The 64-bit ROM code and associated ROM function control logic allow the DS18S20 to operate as a l-wire device using the protocol detailed in the l-WIRE BUS SYSTEM section of this datasheet.
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