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DS28EA00

DS28EA00

1-Wire Digital Thermometer with Sequence Detect and PIO

First 1-Wire Digital Temperature Sensor with Chain-Mode Function and GPIO

Data Sheet
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Overview

Description

The DS28EA00 is a digital thermometer with 9-bit (0.5°C) to 12-bit (1/16°C) resolution and alarm function with nonvolatile (NV), user-programmable upper and lower trigger points. Each DS28EA00 has its unique 64-bit registration number that is factory-programmed into the chip. Data is transferred serially through the 1-Wire® protocol, which requires only one data line and a ground for communication. The improved 1-Wire front end with hysteresis and glitch filter enables the DS28EA00 to perform reliably in large 1-Wire networks. Unlike other 1-Wire thermometers, the DS28EA00 has two additional pins to implement a sequence detect function. This feature allows the user to discover the registration numbers according to the physical device location in a chain, e.g., to measure the temperature in a storage tower at different height. If the sequence detect function is not needed, these pins can be used as general-purpose input or output. The DS28EA00 can derive the power for its operation directly from the data line ("parasite power"), eliminating the need for an external power supply.
DS28EA00: Typical Operating Circuit DS28EA00: Typical Operating Circuit Enlarge+

Key Features

  • Digital Thermometer Measures Temperatures from -40°C to +85°C
  • Thermometer Resolution is User-Selectable from 9 to 12 Bits
  • Unique 1-Wire Interface Requires Only One Port Pin for Communication
  • Each Device has a Unique 64-Bit Factory-Lasered Registration Number
  • ROM Multidrop Capability Simplifies Distributed Temperature-Sensing Applications
  • Improved 1-Wire Interface with Hysteresis and Glitch Filter
  • User-Definable Nonvolatile (NV) Alarm Threshold Settings/User Bytes
  • Alarm Search Command to Quickly Identify Devices Whose Temperature is Outside of Programmed Limits
  • Standard and Overdrive 1-Wire Speed
  • Two General-Purpose Programmable IO (PIO) Pins
  • Chain Function Sharing the PIO Pins to Detect Physical Sequence of Devices in Network
  • Operating Range: 3.0V to 5.5V, -40°C to +85°C
  • Can be Powered from Data Line
  • 8-Pin µSOP Package

Applications/Uses

  • Any Rack-Based Electronic System
  • Climate Control
  • Data communication equipment
  • Process Temperature Monitoring
  • Servers
  • Wireless Basestations

Parametric Specs

Part NumberSensor TypeFunctionsInterfaceChannelsAccuracy
(±°C)		Parasite Pwr.Temp. Thresh.Temp. Resolution
(bits)		Multi DroppableOper. Temp.
(°C)		Package/PinsBudgetary
Price
See Notes
DS28EA00 LocalChain Mode Function1-WireOne0.5YesProgrammable (NV)
9
10
11
12
Yes-40 to +85
µMAX/8
$2.32 @1k
See All Temperature Sensors (113)
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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources


DS28EA00EVKIT: Evaluation Kit for the DS28EA00

Technical Documents

Reference Schematic 5508 Create a 1-Wire Master with Xilinx PicoBlaze
App Note 5507 Understanding the DS1WM Synthesizable 1-Wire Bus Master
App Note 4717 Injection Molding an IC into a Connector or Consumable Item
Tutorial 4702 Easily Add Memory, Security, Monitoring, and Control to Medical Sensors and Consumables
Reference Schematic 4477 Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V
App Note 4334 Add Thermal Monitoring to Reduce Data Center Energy Consumption
Tutorial 4255 How to Power the Extended Features of 1-Wire® Devices
App Note 4037 Regain Location Information by Leveraging the 1-Wire® Chain Function—A Simple Signaling and Protocol Method Determines Device Physical Location
App Note 3989 Add Control, Memory, Security, and Mixed-Signal Functions with a Single Contact
App Note 3930 Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices

Quality and Environmental Data

Product Reliability Reports: DS28EA00.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • DS28EA00U+
  • DS28EA00U+T&R
    •

    Quality And Environmental

    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

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