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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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Key Features
Applications/Uses
Parametric specs for Temperature Sensors
| Sensor Type | Local |
| # Channels | One |
| Interface | 1-Wire |
| Functions | Chain Mode Function |
| Accuracy (±°C) | 0.5 |
| Parasite Pwr. | Yes |
| Temp. Thresh. | Programmable (NV) |
| Temp. Resolution (bits) | 9 10 11 12 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | UMAX/8 |
| Budgetary Price (See Notes) | 2.59 |
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Simplified Block Diagram
Technical Docs
| Data Sheet | 1-Wire Digital Thermometer with Sequence Detect and PIO | Jul 02, 2019 |
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Parameters
Parametric specs for Temperature Sensors
| Sensor Type | Local |
| # Channels | One |
| Interface | 1-Wire |
| Functions | Chain Mode Function |
| Accuracy (±°C) | 0.5 |
| Parasite Pwr. | Yes |
| Temp. Thresh. | Programmable (NV) |
| Temp. Resolution (bits) | 9 10 11 12 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | UMAX/8 |
| Budgetary Price (See Notes) | 2.59 |
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
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.
Technical Docs
| Data Sheet | 1-Wire Digital Thermometer with Sequence Detect and PIO | Jul 02, 2019 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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