The iButton® temperature/data logger (DS2422) combines the core functions of a fully featured data logger in a single chip. It includes a temperature sensor, real-time clock (RTC), memory, 1-Wire® interface, and serial interface for an analog-to-digital converter (ADC), as well as control circuitry for a charge pump. The ADC and the charge pump are peripherals that can be added to build application-specific data loggers. Without an external ADC, the DS2422 functions as a temperature logger only. It measures the temperature and/or reads the ADC at a user-defined rate. Additionally, the DS2422 can store 8192 8-bit readings or 4096 16-bit readings taken at equidistant intervals ranging from 1 second up to 273 hours.
Automatically Wakes Up, Measures Temperature and/or Reads an External ADC and Stores Values in 8KB of Datalog Memory in 8 or 16-Bit Format
On-Chip Direct-to-Digital Temperature Converter with 8-Bit (0.5°C) or 11-Bit (0.0625°C) Resolution
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 and Data Alarms
Quick Access to Alarmed Devices Through 1-Wire Conditional Search Function
512 Bytes of General-Purpose Memory Plus 64 Bytes of Calibration Memory
Two-Level Password Protection of all Memory and Configuration Registers
Unique Factory-Lasered 64-Bit Registration Number Assures Error-Free Device Selection and Absolute Part Identity
Built-in Multidrop Controller Ensures Compatibility with Other Dallas Semiconductor 1-Wire Net Products
Directly Connects to a Single Port Pin of a Microprocessor and Communicates at up to 15.4kbps at Standard Speed or up to 125kbps in Overdrive Mode
-40°C to +85°C Operating Range
2.8V to 3.6V Single-Supply Battery Operation
Low Power (1.2µA Standby, 350µA Active)
Data logging (with an external ADC and charge pump), the DS2422S could be used in many data logging functions, such as pressure monitoring, light sensor monitoring, logging thermocouple temperatures, etc.
Monitoring of refrigeration systems, and environmental or thermal management systems (HVAC).
Temperature-Critical Product Shipping and Storage, such as Fresh Produce, Pharmaceuticals, and Blood Products.
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