 The DS18S20 digital thermometer provides 9-bit centigrade temperature
measurements and has an alarm function with nonvolatile user-programmable upper
and lower trigger points. The DS18S20 communicates over a 1-Wire bus that by definition
requires only one data line (and ground) for communication with a central microprocessor.
It has an operating temperature range of -55°C to +125°C and is accurate to ±0.5°C
over the range of -10°C to +85°C.
Each DS18S20 has a unique 64-bit serial code, which allows multiple DS18S20s
to function on the same 1-Wire bus; thus, it is simple to use one microprocessor
to control many DS18S20s distributed over a large area. Applications that can benefit
from this feature include HVAC environmental controls, temperature monitoring systems
inside buildings, equipment or machinery, and process monitoring and control systems.
Key Features
- Unique 1-Wire interface requires only one port pin for communication.
- Each device has a unique 64-bit serial code stored in an onboard ROM.
- Multidrop capability simplifies distributed temperature sensing applications.
- Requires no external components.
- Power supply range is 3.0V to 5.5V.
- Measures temperatures from -55°C to +125°C (-67°F to +257°F).
- ±0.5°C accuracy from -10°C to +85°C.
- 9-bit thermometer resolution.
- Converts temperature in 750ms (max.).
- User-definable nonvolatile (NV) alarm settings.
- Alarm search command identifies and addresses devices whose temperature
is outside of programmed limits (temperature alarm condition).
Applications
- Thermostatic controls
- Industrial systems
- Consumer products
- Thermometers
- Any thermally sensitive system.
|
Part Number |
Accuracy (±°C) |
Supply Voltage Range (V) |
Optimal Range (°C) |
Temp. Thresh. (°C) |
Meas. Res. (Bits) |
Package |
|
DS18B20 |
0.5 |
3.0 to 5.5 |
-55 to +125 |
1, Prog. NV |
9 - 12 |
3-Pin TO-92 |
|
DS18S20 |
0.5 |
3.0 to 5.5 |
-55 to +125 |
1, Prog. NV |
9 |
3-Pin TO-92 |
|
