 The DS1822Z is a digital thermometer with ±2°C accuracy over a -10°C to +85°C
range. Data is read out over a 1-Wire serial bus in 2's complement format with
9 to 12 bits of resolution (user-programmable).
The DS1822Z offers thermostatic functionality with over-temperature (TH)
and under-temperature (TL) user-programmable setpoints stored in
on-chip EEPROM. An internal flag is set when the measured temperature is greater
than TH or less than TL. If thermostatic operation is not
required, the two bytes of EEPROM reserved for TH and TL
may be used for general-purpose nonvolatile storage.
Each DS1822Z features a unique and unchangeable 64-bit silicon serial number,
which serves as the bus address for the sensor. This allows multiple DS1822Z
devices to coexist on the same 1-Wire bus. The DS1822Z may be locally powered via
a 3.0V to 5.5V supply, or power can be derived from the 1-Wire data line
("parasite power").
The DS1822Z is offered in a 150mil 8-pin SO package. Also available is the
high-precision
DS18B20,
which provides ±0.5°C accuracy and is software-compatible with the DS1822Z.
Key Features
- ±2°C accuracy from -10°C to +85°C
- Measures temperatures from -55°C to +125°C (-67°F to +257°F)
- 9- to 12-bit user-configurable resolution
- 1-Wire interface requires only one port pin for communication
- Has a 64-bit unique and unchangeable electronic serial number
- Multi-drop capability for simplified distributed temperature sensing
- Alarm function with user-defined non-volatile alarm settings
- Converts temperature to 12-bit digital word in 750ms (max.)
- No external components required to measure temperature
- 3.0V to 5.5V supply range
- Optional "parasite-power" operation (power derived directly from 1-Wire
bus)
- 150mil 8-pin SO package
Key Specifications: Temperature Sensors and
Temperature Switches
| Part Number |
Interface |
Accuracy (±°C) |
Parasite Power |
Temp. Thresh. (°C) |
Meas. Res. (Bits) |
| DS1822Z |
1-Wire |
2 |
Yes |
1, Prog. NV |
9 to 12 |
| 
