GENERAL DESCRIPTION

The DS2422 temperature/datalogger combines the core functions of a fully featured datalogger in a single chip. It includes a temperature sensor, realtime 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.

FEATURES

■ 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)

APPLICATIONS

Temperature Logging in Cold Chain, Food Safety, and Bio Science

High-Temperature Logging (Process Monitoring, industrial Temperature Monitoring)

General-Voltage Datalogging (Pressure, Humidity, Light, Material Stress)