DS18S20+ Maxim Integrated Products, DS18S20+ Datasheet - Page 6

• Manufacturer Part Number: DS18S20+
• Description: Board Mount Temperature Sensors PARASITE POW DIG THERMOMETER 1-WR
• Manufacturer: Maxim Integrated Products

Specifications of DS18S20+

• Temperature Threshold: Programmable
• Full Temp Accuracy: +/- 0.5 C
• Package / Case: TO-92
• Digital Output - Bus Interface: 1-Wire
• Digital Output - Number Of Bits: 9 bit
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 3 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Output Type: Digital
• Supply Current: 1.5 mA
• Ic Output Type: Digital
• Sensing Accuracy Range: ± 0.5°C
• Temperature Sensing Range: -55°C To +125°C
• Supply Voltage Range: 3V To 5.5V
• Resolution (bits): 9bit
• Rohs Compliant: Yes
• Dc: 08+
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 4. Supplying the Parasite-Powered DS18S20 During Temperature Conversions
Figure 5. Powering the DS18S20 with an External Supply
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
µP
µP
LSB
V
PU
V
MSB
PU
4.7k
4.7k
48-BIT SERIAL NUMBER
1-Wire BUS
6 of 23
V
PU
1-Wire BUS
GND
DS18S20
DQ
LSB
V
DD
GND
DS18S20
MSB
DQ
V
8-BIT FAMILY CODE (10h)
DD
V
(EXTERNAL SUPPLY)
DD
TO OTHER
1-WIRE DEVICES
TO OTHER
1-WIRE DEVICES
DS18S20
LSB