Hello! now About Us
+86 075582561136
Upload BOM
DS18B20+: The Legendary Sensor That Conquered Temperature Measurement with One Wire
5/15/2026 2:42:41 AM
In the vast universe of temperature sensors, Analog Devices' (formerly Maxim Integrated) DS18B20+ is undoubtedly the brightest star. This digital temperature sensor, featuring the ingenious 1-Wire single-bus interface, completes both power delivery and communication using just a single data line - completely revolutionizing the wiring logic of traditional temperature measurement. It has become the "national-level" sensor of choice for industrial control, environmental monitoring, and smart home applications.Core Specifications at a Glance
|
Parameter |
Specification |
|
Temperature Range |
-55°C ~ +125°C |
|
Accuracy |
±0.5°C (-10°C ~ +85°C) |
|
Resolution |
9~12 bits programmable (up to 0.0625°C) |
|
Supply Voltage |
3.0V ~ 5.5V |
|
Communication Protocol |
1-Wire single bus |
|
Package Types |
TO-92 / SOIC-8 / µSOP-8 |
|
Unique ID |
64-bit laser ROM serial number |
|
Resolution Precision |
Max Conversion Time |
|
9-bit |
0.5°C 93.75ms |
|
10-bit |
0.25°C 187.5ms |
|
11-bit |
0.125°C 375ms |
|
12-bit |
0.0625°C 750ms |
Q&A
Q: Why does the DS18B20+ only need one wire?
A: Because it uses the 1-Wire protocol. The DQ data line serves double duty - carrying both communication signals and parasitic power. During high-level pulses, the internal capacitor charges; during low-level pulses, it discharges to power the chip. No separate power pin is needed.
Q: How do multiple sensors coexist on the same wire without conflict?
A: Each DS18B20+ has a globally unique 64-bit ROM serial number. The host identifies each device individually using the SEARCH ROM (0xF0) command, enabling multi-drop networking with theoretically dozens of sensors on one bus.
Q: What if readings always show +85°C or -127°C?
A: +85°C is the power-on default; -127°C indicates a communication failure. Common causes include: forgetting to send CONVERT T (0x44) to start conversion, missing the 4.7kΩ pull-up resistor on the data line, or insufficient current in parasitic power mode.
The DS18B20+ supports both external power and parasitic power modes. While parasitic mode saves a wire, current draw during temperature conversion can reach 1.5mA - so multiple sensors in parallel require a MOSFET strong pull-up solution. For cable runs exceeding 50 meters, shielded twisted pair is recommended, as ordinary signal wires are prone to interference-induced data errors.
Fudong Communication (Shenzhen) Group Co., Ltd., established in 2004, is a specialized global first tier semiconductor agent/distributor.
Fudong Mall is an online e-commerce platform belonging to Fudong Communication (Shenzhen) Group Co., Ltd. Fudong collaborates with global electronic component distributors and Chinese spot inventory suppliers.
Blog Category
BlogsTags
Related Information
2026-10-08
- 1500+ Daily average RFQ Volume
- 20,000.000 Standard Product Unit
- 1800+ Worldwide Manufacturers
- 15,000+ In-stock Warehouse
