DS1822: Econo 1-Wire Digital Thermometer Data Sheet (Rev. 3)4/28/2015245K
Features and Benefits
- 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.
- Fire Alarm Systems
- Hard Disk Drive
- Storage Area Networks (SANs)
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
DS1822 Reliability Data1/12/2023154K
UG-4277: Getting Started with the MAXQ2000 USB Thumb Evaluation Kit9/24/2008301K
Wirelessly Powering and Accessing a 1-Wire Network3/14/2019
Simple Software Validates the Hardware CRC and Detects Errors in the Serial Bit Stream of 1-Wire® Thermal Devices9/25/2009
Comparison of the DS18B20 and DS18S20 1-Wire® Digital Thermometers3/18/2009
Single-Wire Serial Bus Carries Isolated Power and Data3/23/2006
Using Dallas' 1-Wire ICs in 1-Cell Li-Ion Battery Packs With Low-Side N-Channel Safety FETs Master4/25/2001
Advanced 1-Wire Network Driver2/14/2023
Thermal Management Handbook5/4/2010
How to Power the Extended Features of 1-Wire® Devices6/17/2008
Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices11/16/2006
1-Wire Master Device Configuration3/3/2004
1-Wire Communication with a Microchip PICmicro Microcontroller9/16/2003
White Paper 5: Using 1-Wire APIs for Data Sheet Commands6/7/2002
Interfacing the DS18X20/DS1822 1-Wire® Temperature Sensor in a Microcontroller Environment3/8/2002
Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products3/29/2001
Tools & Simulations
DS1822 Companion Parts
Recommended Related Parts
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