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DS18B20
LMDS18B20 is a popular one‑wire digital temperature sensor from Maxim. It only needs one data line to complete communication with microcontroller, greatly saving IO resource. Multiple DS18B20 sensors can be mounted on the same bus, each chip has unique 64‑bit ROM address for individual access.
Temperature resolution can be configured from 9‑bit to 12‑bit; 12‑bit mode gives 0.0625 °C step value. It supports two power supply modes: external 3.0V‑5.5V power supply or parasitic power supply powered by data bus without extra power wire.
Package is TO‑92 through‑hole, easy for breadboard experiment. Operating temperature range: ‑55 °C ~ +125 °C. Built‑in user‑configurable upper and lower temperature alarm trigger registers.
Typical applications include industrial equipment temperature monitoring, greenhouse temperature collection, water temperature measurement, Arduino / STM32 development projects. Pay attention to bus pull‑up resistor when using parasitic power mode to ensure stable communication.
1. 1‑Wire Single‑Bus Digital Thermometer Sensor DS18B20 is a well‑known digital temperature sensor IC from Maxim Integrated. It adopts exclusive 1‑Wire communication protocol, only one data line plus ground for MCU communication. Each chip integrates unique 64‑bit ROM serial number, supports multi‑drop connection, multiple sensors can share one single bus, convenient for distributed multi‑point temperature measuring system layoutAnalog Dev....
2. Wide Temperature Range & Programmable Measurement Resolution Measurement range covers ‑55℃ to +125℃. Typical accuracy ±0.5℃ within ‑10℃ ~ +85℃. User‑configurable resolution from 9‑bit to 12‑bit, conversion time adjustable according to precision requirement. Built‑in non‑volatile EEPROM supports user‑defined high/low temperature alarm threshold, trigger alarm flag when temperature exceeds setting valueAnalog Dev....
3. Dual Power Supply Mode: External Power & Parasite Power Support 3.0V‑5.5V external power supply; also support parasite‑power mode, draws operating energy directly from 1‑Wire data bus without local power source, perfectly fits remote probe and wiring‑limited field installation scenariosAnalog Dev.... TO‑92 3‑pin through‑hole plastic package, easy for manual soldering and PCB assembly.
4. Simple Digital MCU Interface & Strong Anti‑interference Performance Fully digital signal output, no analog ADC circuit required. Compatible with Arduino, STM32, Raspberry Pi and other mainstream microcontrollers. Digital transmission effectively avoids signal attenuation for long‑distance wiring, stable reading performance for field industrial environment. No extra peripheral components required, simplifies hardware design.
5. Mature Universal Sensing Component Mass‑produced classic temperature‑sensing chip, widely used for new‑product development, experimental prototype, BOM replacement and equipment maintenance. RoHS compliant, abundant global stock for industrial, household and educational projects.
Item | Specifications |
|---|---|
Part Number | DS18B20 |
Product Series | 1‑Wire Programmable Digital Thermometer IC |
Manufacturer | Maxim Integrated (ADI) |
Measuring Range | ‑55℃ ~ +125℃ |
Typical Accuracy | ±0.5℃ @‑10℃ ~ +85℃ |
Resolution | 9‑bit ~ 12‑bit user programmable |
Conversion Time | Max 750ms @12‑bit resolution |
Communication Interface | 1‑Wire single bus, multi‑drop support |
Unique ID | 64‑bit on‑chip ROM serial number |
Supply Voltage | 3.0V ~ 5.5V DC |
Power Mode | External power / Parasite bus‑powered |
Package | TO‑92 3‑Lead Through‑Hole |
Pin Definition | Pin1:GND; Pin2:DQ Data; Pin3:VDD |
Mounting Style | Through Hole |
Compliance | RoHS Compliant |
Core Advantages | 1‑Wire multi‑point bus, parasite power option, wide temperature range, programmable resolution, built‑in temperature alarm, long‑distance stable digital transmission, compact TO‑92 package |
Application Grade | Distributed Multi‑point Temperature Monitoring, HVAC Control, Industrial Equipment Thermal Detection, Water‑proof Temperature Probe Module, Embedded Thermal Protection, Educational Development Platforms, BOM Replacement & Equipment Refurbishment |
1. Distributed Multi‑Point Temperature Monitoring System Multiple DS18B20 sensors hang on one 1‑Wire bus, realize multi‑node temperature collection for cabinet, warehouse, workshop and building environment monitoring.
2. HVAC & Environmental Control Equipment Temperature acquisition for air‑conditioning, ventilation system, cold‑storage cabinet temperature measuring and thermostat control unit.
3. Industrial Equipment & Remote Probe Detection Support long‑distance signal transmission, widely used for waterproof temperature probe, mechanical equipment thermal monitoring, process temperature feedback.
4. Embedded Device & Thermal Protection Circuit Temperature detection for power equipment, battery system, automatic over‑temperature alarm and fan control trigger function.
5. Prototype Development & Equipment Repair Replacement Classic sensor for Arduino / STM32 experimental projects, standard replacement chip for legacy temperature‑measuring equipment maintenance, convenient for BOM material matching.
