DS28EA00
1-Wire Digital Thermometer with Sequence Detect and PIO
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First 1-Wire Digital Temperature Sensor with Chain-Mode Function and GPIO
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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
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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
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DS28EA00
Documentation
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Data Sheet
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DS28EA00: 1-Wire Digital Thermometer with Sequence Detect and PIO Data Sheet (Rev.2)
Reliability Data
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21.31K
Design Note
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Documentation
Data Sheet 1
Reliability Data 1
Design Note 2
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
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| DS28EA00U+ |
Micro-MAX, Thin Shrink Small-Outline
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| DS28EA00U+T&R |
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- DS28EA00U+
- Pin/Package Drawing
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Micro-MAX, Thin Shrink Small-Outline
- Documentation
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Material Declaration
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HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
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Ultra Librarian
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SamacSys
- DS28EA00U+T&R
- Pin/Package Drawing
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Micro-MAX, Thin Shrink Small-Outline
- Documentation
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HTML
Material Declaration
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HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
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Ultra Librarian
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SamacSys
Software & Part Ecosystem
| Parts | Product Life Cycle | Description | ||
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1-Wire Interface Products3 |
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PRODUCTION |
Serial to 1-Wire Line Driver |
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PRODUCTION |
8-Channel 1-Wire Master |
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PRODUCTION |
Single-Channel 1-Wire Master |
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Can't find the software or driver you need?
Request a Driver/SoftwareEvaluation Kits 1
DS28EA00EVKIT
Evaluation Kit for the DS28EA00
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 Detail
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