DS28EA00

1-Wire Digital Thermometer with Sequence Detect and PIO

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

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Overview

Features and Benefits
Product Details

Features and Benefits

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

Product Details

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.

Applications

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

Product Categories

Embedded Security and 1-Wire
- 1-Wire Temperature Sensors

A/D Converters (ADC)
- Digital Temperature Sensors

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Product Lifecycle Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

DS28EA00EVKIT

Evaluation Kit for the DS28EA00

DS28EA00EVKIT

View Detailed Evaluation Kit Information

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

Features & 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

Documentation & Resources

Data Sheets

DS28EA00: 1-Wire Digital Thermometer with Sequence Detect and PIO Data Sheet (Rev. 2)
7/2/2019

PDF

1M

Reliability Data

DS28EA00 Reliability Data
1/12/2023

PDF

21K

Design Notes

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How to Power the Extended Features of 1-Wire® Devices
6/17/2008
Package Thermal Resistance Values (Theta JA, Theta JC) for Temperature Sensors and 1-Wire Devices
11/16/2006
Guidelines for Reliable Long Line 1-Wire Networks
11/16/2001

Product Recommendations

DS28EA00 Companion Parts

Recommended Related Parts

DS2480B, DS2482-800, DS2482-100.

Design Resources

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Buy Now Pricing

(**) Displayed Buy Now Price and Price Range is based on small quantity orders.

List Pricing

(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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