DS28EA00 | GUILCOR SENSORS

DS28EA00
Temperature sensors

Advanced 1‑Wire sensor with integrated authentication, providing secure and accurate temperature measurements.

Maximum precision
+/- 0.50°K

Minimum temperature
-55°C

Maximum temperature
+125°C

Minimum dimensions
4 x 6 x 27

Response time
Fast

Self-heating
Low

Price
Medium

Drift
Low

What is a DS28EA00 sensor ?

The DS28EA00 is a next-generation 1-Wire digital temperature sensor that integrates:

a calibrated thermal sensor (like the DS18B20),
a location function on the 1-Wire bus,
and a 64-bit EEPROM memory with a configurable address.

It is the ideal sensor for complex measurement networks or industrial multipoint chains, where the physical and software identification of each probe is essential.

Operating principle

The DS28EA00 converts temperature into a 12-bit coded digital data, transmitted via the 1-Wire bus.

It adds a key innovation: the "chain mode" localization, allowing for the detection of the physical position of each sensor on the bus.

T = Brut Value / 16

Each sensor can thus be automatically identified, configured, and addressed by the microcontroller.

Technical specifications

Parameter	Typical value
Measurement range	−55 °C → +125 °C
Typical accuracy	±0,5 K (−10 → +85 °C)
Resolution	9 to 12 bits configurable
Conversion time	93.75 to 750 ms
Operating temperature	−55 °C → +150 °C
Alimentation	3.0 → 5.5 V (or noise)
Interface	1-Wire Bus with localization (chain mode)
Annual drift	Low (±0.2 K/year)
Unique identifier	64 bits (family 0x42)
Case	TO-92, SOT-23, waterproof cable IP68

Wiring configuration

Type	Description	Precision
3-wires	VDD + DATA + GND	✅ Standard
2 fils (parasite)	DATA + GND	💡 Low consumption applications
2 fils (parasite)	Serial communication for automatic detection	🏭 Professional multipoint networks

Self-heating

The self-heating remains very low (< 0.2 °C) even in "chain" mode, ensuring stable accuracy over long sensor chains.

Application areas

🧠 Long-distance industrial 1-Wire networks

⚙️ Multipoint monitoring (electrical cabinets, racks, production lines)

💧 HVAC and environmental applications

🔋 Chain measurements with automatic physical identification

🧱 Integration into IoT systems and distributed thermal servers

Should I choose a DS18EA00 sensor ?

Strengths points

🧭 Automatic sensor localization
→ Thanks to its exclusive "chain" mode, the DS28EA00 can determine the physical order of sensors on the same bus. No more reversed connections or misidentified sensors!
🎯 High precision and stability
→ With an accuracy of ±0.5 K and a drift of less than ±0.2 K/year, it ensures reliable long-term measurements, even in complex 1-Wire networks.
🧩 Configurable identifier and internal memory
→ Its built-in EEPROM allows for the storage of user data (ID, thresholds, calibration) directly in the sensor ideal for traceability installations.

Weaknesses points

⚙️ Cost higher than the DS18B20
→ Its advanced features (EEPROM, localization, chain mode) make it a more expensive product, reserved for professional applications.
🔌 Increased software complexity
→ The chain mode requires specific software management on the microcontroller side (dedicated libraries or custom firmware).
→Beyond 30 m, the "chain mode" topology can become unstable without shielded cabling or appropriate termination resistors.

Useful information

Here is some useful information regarding the DS28EA00 sensors.

Resolution and precision

The DS28EA00 follows the structure of the DS18B20 (12-bit ADC + internal calibration), but adds an identification EEPROM and a "chain mode" protocol.

Its accuracy and stability are comparable to those of high-end professional 1-Wire sensors.

Resolution	No measurement (°C)	Conversion time	Accuracy (−10 → +85 °C)	Extended accuracy (−55 → +125 °C)
9 bits	0,5 °C	93,75 ms	±1,0 K	±1,5 K
10 bits	0,25 °C	187,5 ms	±0,75 K	±1,2 K
11 bits	0,125 °C	375 ms	±0,5 K	±1,0 K
12 bits	0,0625 °C	750 ms	±0,5 K	±0,75 K

🔹 Remarks:

Adjustable resolution via the internal configuration register.
Low annual drift (±0.2 K/year) thanks to factory digital calibration.
Compatible with all 1-Wire masters (same communication protocol as the DS18B20).

Application example – Reading a DS28EA00

The DS28EA00 transmits its temperature and identification information via the 1-Wire bus.

Its conversion to °C follows the same logic as the sensors in the DS18xx family:

T(°C) = Raw Value / 16

🔹 Example 1 – Standard reading at 12 bits

The sensor returns:

LSB = 0x70
MSB = 0x05

Raw value 0x0570 = 1392₁₀ T = 1392 / 16 = 87.0 °C

✅ Result: the measured temperature is 87.0 °C.

🔹 Example 2 – Negative reading

The sensor returns:

LSB = 0x90
MSB = 0xFF

Raw value (two's complement):

Raw value 0xFF90 = -112₁₀ T = -112 / 16 = -7.0 °C

✅ Result: measured temperature = −7.0 °C.

🔹 Additional data

In addition to the temperature, the DS28EA00 provides:

🆔 Its unique 64-bit address,
💾 A 64-bit user memory field (EEPROM),
🔗 Position information in the chain (“chain mode”).

Integration diagram in an electronic system

The DS28EA00 operates as a standard 1-Wire sensor, but it can be connected in a daisy-chain topology, allowing the microcontroller to identify the physical location of each sensor.

🔹 Typical components

Component	Function
DS28EA00	1-Wire Temperature Sensor with EEPROM and Chain Mode
Pull resistance (4.7 kΩ)	Keep the bus in a high state
Microcontroller (ESP32, STM32, Raspberry Pi, etc.)	Master 1-Wire
Power supply 3.0–5.5 V	Source or parasitic power
Shielded cabling (if >30 m)	Noise and Reflection Reduction

🔹 Functional diagram (ASCII)

Classic 3-wire mode

+3.3V / +5V │ [4.7kΩ] │ DATA ────┼──────────────┐ │ │ GND DS28EA00 │ GND

Chain mode (series topology)

µC ── DS28EA00 #1 ── DS28EA00 #2 ── DS28EA00 #3 ── GND ↑ ↑ ↑ Position 1 Position 2 Position 3

🔹 Operating Principle

1️⃣ The microcontroller initializes the bus and detects the presence of each sensor.

2️⃣ In "chain" mode, the DS28EA00 transmits its physical position (1st, 2nd, 3rd, etc.).

3️⃣ Each sensor can be addressed directly by its ID or its position in the chain.

4️⃣ The temperature and identification data are then read via "Read Scratchpad" (0xBE).

Multi-point advantage – Location & unique ID

The DS28EA00 stands out for its ability to manage the most complex multipoint networks:

Function	Description
Unique 64-bit ID (0x42)	Reliable identification of each sensor on the bus
User EEPROM 64 bits	Local storage of information (name, threshold, calibration)
Chain mode	Automatic detection of sensor order
DS18B20 Compatibility	Same protocol, same library