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MAXIM DS18B20+ product image
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MAXIM DS18B20+RoHS

Manufacturer
MAXIM
MPN
DS18B20+
LCSC Part #
C9753
Packaging
TO-92
Customer #
Key Attributes
Programmable Resolution 1-Wire Digital Thermometer
Datasheetpdf iconMAXIM DS18B20+
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10+$ 1.0982$ 10.98
30+$ 0.9583$ 28.75
100+$ 0.8542$ 85.42
500+$ 0.8102$ 405.10
1,000+$ 0.7891$ 789.10
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Products Specifications

All
TypeDescription
CategorySensors, Transducers/Temperature Sensors/Analog and Digital Output
ManufacturerMAXIM
PackagingTO-92
Operating Temperature-
Detection Temperature Range-55℃~+125℃
Voltage - Supply3V~5.5V
InterfaceSingle bus
Tolerance±0.5℃
Standby Current1uA
Temperature Conversion Time750ms
FeaturesTemperature threshold monitoring;Configurable temperature output;On-chip non-volatile parameter storage
Temperature Resolution12bit
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Introduction

AI Translation

The DS18B20 digital thermometer provides 9- bit to 12- bit Celsius temperature measurements and has an alarm function with nonvolatile user- programmable upper and lower trigger points. The DS18B20 communicates over a 1- Wire bus that by definition requires only one data line (and ground) for communication with a central microprocessor. In addition, the DS18B20 can derive power directly from the data line ("parasite power"), eliminating the need for an external power supply. Each DS18B20 has a unique 64- bit serial code, which allows multiple DS18B20s to function on the same 1- Wire bus. Thus, it is simple to use one microprocessor to control many DS18B20s distributed over a large area. Applications that can benefit from this feature include HVAC environmental controls, temperature monitoring systems inside buildings, equipment, or machinery, and process monitoring and control systems.

Features

AI Translation
  • Unique 1- Wire Interface Requires Only One Port Pin for Communication
  • Reduce Component Count with Integrated Temperature Sensor and EEPROM
  • Measures Temperatures from -55℃ to +125℃ (-67°F to +257°F)
  • ±0.5℃ Accuracy from -10℃ to +85℃
  • Programmable Resolution from 9 Bits to 12 Bits
  • No External Components Required
  • Parasitic Power Mode Requires Only 2 Pins for Operation (DQ and GND)
  • Simplifies Distributed Temperature- Sensing Applications with Multidrop Capability
  • Each Device Has a Unique 64- Bit Serial Code Stored in On- Board ROM
  • Flexible User- Definable Nonvolatile (NV) Alarm Settings with Alarm Search Command
  • Identifies Devices with Temperatures Outside Programed Limits
  • Available in 8- Pin SO (150 mils), 8- Pin sSOP, and 3- Pin TO- 92 Packages

Applications

AI Translation
  • Thermostatic Controls
  • Industrial Systems
  • Consumer Products
  • Thermometers
  • Thermally Sensitive Systems

Product FAQ

  • 1. What power supply boundaries, temperature sensing limits, and measurement accuracy specifications govern the DS18B20+?
    The DS18B20+ is a digital temperature sensor operating across an external supply voltage (VDD) range of 3.0V to 5.5V. It measures temperatures from -55°C to +125°C with an accuracy of ±0.5°C over the -10°C to +85°C range. During temperature conversions, the active supply current is 1.5mA maximum at 5V, while standby current is 750nA typical.
  • 2. How does resolution selection alter temperature measurement precision and conversion timing in the DS18B20+?
    The DS18B20+ features a user-programmable temperature resolution of 9, 10, 11, or 12 bits, corresponding to temperature increments of 0.5°C, 0.25°C, 0.125°C, and 0.0625°C, respectively. Higher resolution increases conversion time, with maximum conversion times of 93.75ms at 9-bit resolution, 187.5ms at 10-bit, 375ms at 11-bit, and 750ms at 12-bit.
  • 3. How does the 1-Wire protocol handle multi-drop network architecture and individual sensor identification?
    The DS18B20+ uses Maxim's proprietary 1-Wire open-drain serial interface, requiring only a single data line (DQ) and ground for communication. Each device contains a factory-programmed, unique 64-bit ROM code consisting of an 8-bit family code (28h), a 48-bit serial number, and an 8-bit CRC. This unique identifier allows multiple DS18B20+ devices to share the same 1-Wire bus while being individually addressed by the bus master. The bus requires an external pullup resistor of approximately 5kΩ.
  • 4. What is parasitic power mode, and how does it reduce physical wiring count in remote sensor nodes?
    In parasite power mode, the DS18B20+ derives operating power directly from the DQ line through an internal parasite power capacitor (CPP), allowing operation using only the DQ and GND connections while the VDD pin is connected to ground. During temperature conversions or EEPROM writes, when the operating current can reach 1.5mA, the 1-Wire bus must be pulled high using a strong pullup (typically implemented with a MOSFET) to provide sufficient operating current.
  • 5. Which package options and pin configurations are available for the DS18B20+?
    The DS18B20+ is available in three package options: a 3-pin TO-92 package (DS18B20), an 8-pin SO package (DS18B20Z), and an 8-pin µSOP package (DS18B20U). The TO-92 package uses a 3-pin configuration consisting of Pin 1: GND, Pin 2: DQ, and Pin 3: VDD.