DS1822
PRODUCTIONEcono 1-Wire Digital Thermometer
- Part Models
- 4
- 1ku List Price
- Starting From $2.63
Overview
- Unique 1-Wire® Interface Requires Only One Port Pin for Communications
- Can Be Powered from Data Line
- Power-Supply Range is 3.0V to 5.5V
- Reduced Component Count with Integrated
Temperature Sensor and Interface
- Requires No External Components
- Measures temperatures from -55°C to +125°C (-67°F to +257°F)
- ±2.0°C Accuracy from -10°C to +85°C
- Thermometer Resolution is User-Selectable from 9 to 12 Bits
- Converts Temperature to 12-Bit Digital Word in 750ms (max)
- Simplifies Distributed Temperature Sensing with Multidrop Capability
- Each Device Has a Unique 64-Bit Serial Code Stored in an On-Board Device
- Flexible, User-Definable Nonvolatile (NV) Alarm Settings with Alarm Search Command Identifies Devices with Temperatures Outside Programmed Limits
- Software compatible with the DS18B20
- Applications Include Thermostatic Controls, Industrial Systems, Consumer Products, Thermometers, or Any Thermally Sensitive System
The DS1822 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 DS1822 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 DS1822 features a unique and unchangeable 64-bit silicon serial number, which serves as the bus address for the sensor. This allows multiple DS1822 devices to coexist on the same 1-Wire bus. The DS1822 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 DS1822 is offered in 3-pin TO-92 (DS1822) and 150mil 8-pin SO (DS1822Z) packages. In addition, the DS1822 is available in a parasite-power only version, the DS1822-PAR. Also available is the high-precision DS18B20, which provides ±0.5°C accuracy and is software-compatible with the DS1822.
Applications
- Fire Alarm Systems
- Hard Disk Drive
- Storage Area Networks (SANs)
- Telecommunications
Documentation
Data Sheet 1
Reliability Data 1
User Guide 1
Design Note 5
Technical Articles 10
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| DS1822+ | TO92 | ||
| DS1822+T&R | TO92 | ||
| DS1822Z+ | Small-Outline IC, Narrow (0.15in) | ||
| DS1822Z+T&R | Small-Outline IC, Narrow (0.15in) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 14, 2020 - 1998A ASSEMBLY |
||
| DS1822+ | PRODUCTION | |
| DS1822+T&R | PRODUCTION | |
|
Nov 10, 2020 - 1702R3 ASSEMBLY |
||
| DS1822Z+ | PRODUCTION | |
| DS1822Z+T&R | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Analog to Digital Converters (ADCs) 2 | ||
| DS1822-PAR | PRODUCTION | Econo Parasite-Power Digital Thermometer |
| DS18B20 | PRODUCTION | Programmable Resolution 1-Wire Digital Thermometer |
Tools & Simulations
IBIS Model 1
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