In distributed temperature monitoring systems, accurately identifying the position of each sensor in the physical chain without increasing wiring complexity has long been an engineering challenge. The DS28EA00, as the first 1-Wire digital thermometer to integrate a Sequence Detect feature, solves this problem at the hardware level. Mingjiada Electronics, a supply chain service provider with nearly three decades of experience in electronic component distribution, offers genuine, original equipment manufacturer (OEM) products, in-stock inventory, and fast delivery support for this device.
What Is the DS28EA00: A 1-Wire Temperature Sensor That “Knows Its Own Location”
The DS28EA00 is a digital temperature sensor introduced by ADI (Analog Devices). Its core temperature measurement range spans −40°C to +85°C, and its resolution can be flexibly configured via software between 9 bits (0.5°C) and 12 bits (1/16°C). The key difference from conventional 1-Wire temperature sensors is the addition of two extra pins dedicated to the Sequence Detect function. This feature allows the host computer to enumerate the 64-bit register numbers of each node in sequence according to the device’s physical order in the daisy chain, rather than through a random ROM search.
In other words, the DS28EA00 not only tells you “what the temperature is,” but also “which position in the chain this temperature comes from.” For applications such as monitoring temperature stratification at different heights in storage towers or collecting thermal distribution data across slots in rack-mounted equipment, this capability directly eliminates the cumbersome ROM search and position-mapping calibration required by traditional solutions. If sequential detection is not required, these two pins can be configured as general-purpose input/output (PIO) for auxiliary control functions such as driving LEDs or reading switch states.
The DS28EA00U sold by Mingjiada Electronics is housed in a µSOP-8 package, labeled with the ADI brand, and is brand-new and factory-sealed.
Key Technical Features: Why Choose the DS28EA00 Over a Standard 1-Wire Thermometer
Sequential detection combined with dual-function PIO pins is the DS28EA00’s most distinctive feature. When dozens or even hundreds of temperature nodes are connected to a single 1-Wire bus, traditional solutions rely on ROM search to poll each device individually—a process that is not only time-consuming but also fails to establish a deterministic correspondence between ROM codes and physical locations. The DS28EA00’s sequential detection mechanism allows the host to discover devices sequentially along a daisy-chain topology, naturally establishing a one-to-one correspondence between “location—registration number—temperature.” The same pair of pins is multiplexed for PIO, further improving pin utilization.
The enhanced 1-Wire front-end integrates hysteresis comparison and interference filtering, providing higher communication reliability than standard devices in large-scale 1-Wire networks. The parasitic power supply capability allows the device to draw power directly from the data line, eliminating the need for additional power lines for each node and significantly reducing wiring costs and assembly complexity in multi-node distributed deployments. The alarm search command quickly identifies devices whose temperatures exceed user-defined upper and lower limits, eliminating the need to cycle through all nodes one by one—making it ideal for monitoring systems that require fast response times.
DS28EA00 Specifications at a Glance
Manufacturer: ADI (Analog Devices)
Product Type: 1-Wire digital thermometer with sequential detection and PIO
Temperature Measurement Range: −40°C to +85°C
Resolution: User-selectable from 9 bits (0.5°C) to 12 bits (1/16°C)
Communication Interface: 1-Wire (single data line + ground), supporting standard and high-speed modes
Unique Identifier: Factory-laser-etched 64-bit registration number
Alarm Function: User-programmable non-volatile (NV) upper/lower limit trigger points
Additional Pins: 2 PIO pins, configurable for sequential detection or general-purpose I/O
Power Supply: 3.0V–5.5V, supports parasitic power from the data line
Package: 8-pin µSOP
Operating Temperature Range: −40°C to +85°C
Key Certifications: RoHS compliant
Typical Application Scenarios
The DS28EA00’s sequential detection capability provides direct value in the following scenarios:
Rack-mounted electronic systems: Temperature gradient monitoring in individual slots within server cabinets and telecommunications equipment racks; sequential detection automatically links temperature readings to slot numbers.
Storage silos/warehouse environments: In vertical spaces such as grain silos, cold storage facilities, and material silos, multiple nodes are deployed in a chain-like configuration along the height axis to directly obtain layered temperature profiles.
Process temperature monitoring: Topology identification for multi-point temperature measurement on industrial production lines, reducing the need for manual calibration.
Wireless base stations and data communication equipment: Thermal status monitoring of remote RF units or inside outdoor cabinets; parasitic power supply reduces the burden on power supply design.
Why Purchase the DS28EA00 Through Mingjiada Electronics
Founded in 1996 and headquartered in Shenzhen, Mingjiada Electronics operates branches in Hong Kong, Japan, Russia, Taiwan, and other locations. It is a globally renowned authorized independent distributor of electronic components. When it comes to purchasing the DS28EA00, its advantages lie in two key areas:
Genuine, authentic products with traceable sourcing. Mingjiada Electronics maintains long-term partnerships with international original manufacturers such as ADI, TI, ST, and NXP, as well as their authorized channels. Its inventory is sourced directly from these partners or authorized distributors, ensuring full traceability and guaranteeing that the DS28EA00U is a brand-new, genuine component. For devices like temperature sensors—which directly impact the reliability of system measurements—the authenticity of the source is particularly critical.
In-Stock Inventory and Flexible Supply. Mingjiada Electronics’ product page shows that the DS28EA00U (µSOP-8) is in stock and available for online quotes. With warehouses located in multiple locations across Shenzhen and Hong Kong, we can meet the needs of various stages—from small-batch sample prototyping to mass production. For component selection verification and small-batch trial production during the R&D phase, the ability to respond with in-stock inventory often has a greater impact on project timelines than the price itself.
Frequently Asked Questions About Procurement and Component Selection
Q: What is the difference between the DS28EA00U and the DS28EA00U+T&R?
Both are different packaging formats for the same chip. The DS28EA00U is typically supplied in a tube, while the DS28EA00U+T&R is supplied in tape-and-reel packaging, suitable for automated surface-mount assembly lines. When placing an order, simply confirm the required packaging format with Mingjiada Electronics.
Q: Is the sequence detection feature mandatory? Is it a waste of pins if it’s not used?
Sequence detection can be completely disabled when not needed; the two additional pins can be used as general-purpose PIO pins, so no functionality goes to waste. If your system requires topology identification in the future, retaining this feature will avoid the need to replace components or redesign the system.
Q: What should be considered for long cables or multi-node scenarios in parasitic power mode?
The DS28EA00’s improved 1-Wire front-end has been optimized for reliability in large networks; however, when there are many nodes or long cables, you should still verify the pull-up resistors and bus capacitance in accordance with the 1-Wire bus design specifications.
Purchasing Inquiries: To obtain real-time inventory status, volume pricing, or sample requests for the DS28EA00U, please visit the Mingjiada Electronics website (www.integrated-ic.com) or contact our sales team at +86 13410018555 or sales@hkmjd.com.
Tags: DS28EA00U, DS28EA00
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