DS28EA00

PRODUCTION

1-Wire Digital Thermometer with Sequence Detect and PIO

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

Data Sheet (Rev. 2) Product Selection Table
Part Models
2
1ku List Price
Starting From $3.27
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Part Details

  • 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
DS28EA00
1-Wire Digital Thermometer with Sequence Detect and PIO
DS28EA00: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 2

Technical Articles 7

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Hardware Ecosystem

Parts Product Life Cycle Description
1-Wire Interface Products 3
DS2480B
Serial to 1-Wire Line Driver
DS2482-800
PRODUCTION 8-Channel 1-Wire Master
DS2482-100
PRODUCTION Single-Channel 1-Wire Master
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Evaluation Kits

DS28EA00EVKIT

Evaluation Kit for the DS28EA00

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Features and Benefits

  • Easy Setup
  • Stand-Alone EV Board
    • Contains Three Separate, Breakable Subsections with a DS28EA00 Per Subsection
    • The Dipswitch Block on Each EV Board Subsection Routes Physical Chain-Mode
    • Connections Between Chips When Used as a Stand-Alone Board
    • EV Board's Subsections are Breakable Into Three Separate Boards Each of Which Evaluates a Single DS28EA00 or, When Cabled Together, Evaluate Chain-Mode Searching
    • LEDs Give Visual Indicators of PIO Activity
    • 6-Pin Terminal Strip Allows PIO Testing Outside of Chain Mode
  • PC Connectivity Included
  • RoHS Compliant
  • Free Downloadable Evaluation Software Available

Product Details

The DS28EA00 evaluation system (EV system) consists of a single evaluation kit (EV kit) that includes an evaluation board (EV board) made up of three subsections that can be broken/snapped off into three independently exercisable boards. See Figure 1 (in the full data sheet) for a picture of the standalone EV board and Figure 2 (in the full data sheet) for a picture of the EV board snapped and cabled together. Three DS28EA00 temperature chips with GPIO and sequence detect can be found on the EV board, one per subsection. Also included in the kit are connectivity items, such as serial cables, a 1-Wire® USB adapter, and jumpers. Free evaluation software, the OneWireViewer, is available for download from the web page listed in the Support Resources (in the full data sheet) section.

Since one of the major features of the DS28EA00 is detection of physical sequence, a block of dip switches are provided on each subsection of the EV board to re-order the physical connection between the chips. Optionally, the customer can break off the subsections of the eval board, connect them together with the provided cables, and re-order the physical sequence of the DS28EA00s that way. The OneWireViewer evaluation software can then be used to exercise the functionality of the chips and provide a way for an evaluator to see the actual physical connection sequence of the chips. The algorithm to detect the connection order is called chain mode. More information on chain mode can be found in Application Note 4037.

Applications

  • Any Rack-Based Electronic System
  • Climate Control
  • Data communication equipment
  • Process Temperature Monitoring
  • Servers
  • Wireless Basestations
DS28EA00EVKIT
Evaluation Kit for the DS28EA00

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