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DS18B20 Datasheet(PDF) 6 Page - Dallas Semiconductor |
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DS18B20 Datasheet(HTML) 6 Page - Dallas Semiconductor |
6 / 22 page DS18B20 6 of 22 Figure 4. Supplying the Parasite-Powered DS18B20 During Temperature Conversions Figure 5. Powering the DS18B20 with an External Supply 64-BIT LASERED ROM CODE Each DS18B20 contains a unique 64–bit code (see Figure 6) stored in ROM. The least significant 8 bits of the ROM code contain the DS18B20’s 1-Wire family code: 28h. 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 of the 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 DS18B20 to operate as a 1-Wire device using the protocol detailed in the 1-Wire Bus System section. Figure 6. 64-Bit Lasered ROM Code 8-BIT CRC 48-BIT SERIAL NUMBER 8-BIT FAMILY CODE (28h) MSB MSB LSB LSB LSB MSB VPU VPU 4.7k 1-Wire BUS μP DS18B20 GND VDD DQ TO OTHER 1-WIRE DEVICES VDD (EXTERNAL SUPPLY) DS18B20 GND VDD DQ VPU 4.7k TO OTHER 1-WIRE DEVICES 1-Wire BUS μP |
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Similar Description - DS18B20 |
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