Features: ·Automatically Wakes up, Measures Temperature, and Stores Values in 8kB of Datalog Memory in 8- or 16-Bit Format
·Digital Thermometer Measures Temperature with 8-Bit (0.5°C) or 11-Bit (0.0625°C) Resolution
·Accuracy Better than ±0.5°C from -10°C to +65°C (DS1922L), ±0.5°C from +20°C to +75°C (DS1922T) with Software Correction
·Water resistant - 1 meter under water for 30 days
·Sampling Rate from 1s up to 273hrs
·Programmable Recording Start Delay After Elapsed Time or Upon a Temperature Alarm Trip Point
·Programmable High and Low Trip Points for Temperature Alarms
·Quick Access to Alarmed Devices Through 1-Wire Conditional Search Function
·512 Bytes of General-Purpose Plus 64 Bytes of Calibration Memory
·Two-Level Password Protection of All Memory and Configuration Registers
·Communicates to Host with a Single Digital Signal at up to 15.4kbps at Standard Speed or up to 125kbps in Overdrive Mode Using 1-Wire Protocol
·Operating Range: DS1922L: -40 to +85°C; DS1922T: 0 to +125°CApplicationTemperature Logging in Cold Chain, Food Safety, Bio Science, and Pharmaceutical and Medical Products High-Temperature Logging (Process Monitoring, Industrial Temperature Monitoring)
SpecificationsI/O Voltage to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V, +6V
I/O Sink Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Operating Temperature Range (DS1922L) . . . . . . . . . . . . . . .-40°C to +85°C
Operating Temperature Range (DS1922T) . . . . . . . . . . . . . . ..0°C to +125°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Storage Temperature Range (DS1922L) . . . . . . . . . . . . . . .-40°C to +85°C*
Storage Temperature Range (DS1922T) . . . . . . . . . . . . . . . . 0°C to +125°C*
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device.
*Storage or operation above +50°C significantly reduces battery life.
DescriptionThe DS1922L/T temperature logger iButtons are rugged, self-sufficient systems that measure temperature and record the result in a protected memory section. The recording is done at a userdefined rate. A total of 8192 8-bit readings or 4096 16-bit readings taken at equidistant intervals ranging from 1s to 273hrs can be stored. In addition to this, there are 512 bytes of SRAM for storing applicationspecific information and 64 bytes for calibration data.
A mission to collect data can be programmed to begin immediately, or after a user-defined delay or after a temperature alarm. Access to the memory and control functions can be password protected. The DS1922L/T is configured and communicates with a host computing device through the serial 1-Wire® protocol, which requires only a single data lead and a ground return. Every DS1922L/T is factory-lasered with a guaranteed unique 64-bit registration number that allows for absolute traceability. The durable stainless-steel package is highly resistant to environmental hazards such as dirt, moisture, and shock. Accessories permit the DS1922L/T to be mounted on almost any object, including containers, pallets, and bags.
DS1922T Data Sheet
