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DS2422
1-Wire® Temperature/Data Logger with 8KB Datalog Memory
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Status
Description
The DS2422 temperature/data logger 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.
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Data Sheet
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Key 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)
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Applications/Uses
- 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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Key Specifications:
| Timekeeping & Real-Time Clocks |
| Part Number |
Functions |
Date/ Time Format |
Interface |
VSUPPLY
(V) |
Time Keeping Current
(nA) |
CL
(pF) |
Memory Type |
Memory Size
(Bytes) |
Time of Day Alarms |
Integrated XTAL |
| hh = sec/100 |
typ |
| DS2422 |
Time/Temperature/Event Recorder |
YY-MM-DD/ HH:MM:SS |
1-Wire |
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1200 |
12.5 |
NV SRAM |
512 |
0 |
No |
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See All Timekeeping & Real-Time Clocks (86)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Simple Temperature Logger
More Information
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Information Index
Document Ref.: 19-4866
Rev 3;
2010-05-21
This page last modified: 2010-05-21
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