Product Summary

The DS18S20 Digital Thermometer provides 9–bit temperature readings which indicate the temperature
of the device.
Information is sent to/from the DS18S20 over a 1–Wire interface, so that only one wire (and ground)
needs to be connected from a central microprocessor to a DS18S20.  Power for reading, writing, and
performing temperature conversions can be derived from the data line itself with no need for an external
power source.
Because each DS18S20 contains a unique silicon serial number, multiple DS18S20s can exist on the
same 1–Wire bus.  This allows for placing temperature sensors in many different places.  Applications
where this feature is useful include HVAC environmental controls, sensing temperatures inside buildings,
equipment or machinery, and process monitoring and control.

Parametrics


Features

Unique 1–Wire interface requires only one
port pin for communication
 Multidrop capability simplifies distributed
temperature sensing applications
 Requires no external components
 Can be powered from data line.  Power supply
range is 3.0V to 5.5V
 Zero standby power required
 Measures temperatures from –55°C to
+125°C.  Fahrenheit equivalent is –67°F to
+257°F
 ±0.5°C accuracy from –10°C to +85°C
 Temperature is read as a 9–bit digital value

 Converts temperature to digital word in

750 ms (max.)
 User–definable, nonvolatile temperature
alarm settings
 Alarm search command identifies and
addresses devices whose temperature is
outside of programmed limits (temperature
alarm condition)
 Functionally compatible with DS1820 1-Wire
digital thermometer
 Applications include thermostatic controls,
industrial systems, consumer products,
thermometers, or any thermally sensitive
system
PIN ASSIGNMENT
PIN DESCRIPTION
GND - Ground
DQ - Data In/Out
VDD - Power Supply Voltage
NC - No Connect

Diagrams

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
DS18S20/T&R
DS18S20/T&R
Maxim Integrated Products
Board Mount Temperature Sensors
Data Sheet
Negotiable 
DS18S20+
DS18S20+
Maxim Integrated Products
Board Mount Temperature Sensors Prgmble Resolution 1-Wire Parasite Pwr
Data Sheet
0-1: $3.40
1-25: $2.28
25-50: $1.65
50-100: $1.63
DS18S20+PAR
DS18S20+PAR
Maxim Integrated Products
Board Mount Temperature Sensors Prgmble Resolution 1-Wire Parasite Pwr
Data Sheet
0-1: $3.42
1-25: $2.28
25-50: $1.65
50-100: $1.63
DS18S20+T&R
DS18S20+T&R
Maxim Integrated Products
Board Mount Temperature Sensors Prgmble Resolution 1-Wire Parasite Pwr
Data Sheet
0-1: $3.11
1-25: $2.35
25-50: $2.09
50-100: $2.05
DS18S20-B70
DS18S20-B70
Maxim Integrated Products
Board Mount Temperature Sensors
Data Sheet
Negotiable 
DS18S20-C01
DS18S20-C01
Maxim Integrated Products
Board Mount Temperature Sensors
Data Sheet
Negotiable 
DS18S20-PAR
DS18S20-PAR
Maxim Integrated Products
Board Mount Temperature Sensors
Data Sheet
Negotiable 
DS18S20-PAR/T&R
DS18S20-PAR/T&R
Maxim Integrated Products
Board Mount Temperature Sensors
Data Sheet
Negotiable