DS18S20 查看數據表（PDF） - Maxim Integrated

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DS18S20

High-Precision 1-Wire Digital Thermometer

Maxim Integrated 

DS18S20

Figure 4. Supplying the Parasite-Powered DS18S20 During Temperature Conversions

VPU

VPU

µP

4.7k

DS18S20

GND DQ VDD

1-Wire BUS

TO OTHER

1-WIRE DEVICES

Figure 5. Powering the DS18S20 with an External Supply

VPU

µP

DS18S20

GND DQ VDD

VDD (EXTERNAL SUPPLY)

4.7k

1-Wire BUS

TO OTHER

1-WIRE DEVICES

64-BIT LASERED ROM CODE

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 1-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 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

DS18S20 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

MSB

8-BIT CRC

48-BIT SERIAL NUMBER

8-BIT FAMILY CODE (10h)

LSB MSB

LSB MSB

LSB

6 of 23

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