DS18B20-SL-TR datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > The sensor> DS18B20-SL-TR

DS18B20-SL-TR: DescriptionBoard Mount Temperature Sensors; CategoryThe sensor; File Size572KB，22 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

Download Datasheet Parametric Compare View All

DS18B20-SL-TR Online Shopping

Suppliers	Part Number	Price	MOQ	In stock
	DS18B20-SL-TR	-	-	View	Buy Now

DS18B20-SL-TR Overview

Board Mount Temperature Sensors

DS18B20-SL-TR Parametric

Parameter Name	Attribute value
Product Category	Board Mount Temperature Sensors
Manufacturer	Maxim
RoHS	No
Output Type	Digital
Configuration	Local
Shutdown	No Shutdown
Temperature Threshold	Programmable
Product	Sensor with Alarm
Operating Supply Current	1.5 mA

Preview

Download Datasheet

View All

AVAILAB

DS18B20

Programmable Resolution

1-Wire Digital Thermometer

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. It has an operating temperature

range of -55°C to +125°C and is accurate to

±0.5°C

over the range of -10°C to +85°C. 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.

Functional Diagrams

DESCRIPTION



User-Definable Nonvolatile (NV) Alarm

Settings

Alarm Search Command Identifies and

Addresses Devices Whose Temperature is

Outside Programmed Limits (Temperature

Alarm Condition)

Available in 8-Pin SO (150 mils), 8-Pin

µSOP,

and 3-Pin TO-92 Packages

Software Compatible with the DS1822

Applications Include Thermostatic Controls,

Industrial Systems, Consumer Products,

Thermometers, or Any Thermally Sensitive

System

PIN CONFIGURATIONS

MAXIM

18B20

1 2 3

N.C.

GND

MAXIM

18B20

SO (150 mils)

(DS18B20Z)

FEATURES



Unique 1-Wire® Interface Requires Only One

Port Pin for Communication

Each Device has a Unique 64-Bit Serial Code

Stored in an On-Board ROM

Multidrop Capability Simplifies Distributed

Temperature-Sensing Applications

Requires No External Components

Can Be Powered from Data Line; Power Supply

Range is 3.0V to 5.5V

Measures Temperatures from -55°C to +125°C

(-67°F to +257°F)

±0.5°C

Accuracy from -10°C to +85°C

Thermometer

appear at end

User Selectable

Pin Configurations

Resolution is

of data sheet.

from 9

Diagrams continued at end of data sheet.

Functional

to 12 Bits

Converts Temperature

Integrated

Digital Word in

UCSP is a trademark of Maxim

to 12-Bit

Products, Inc.

750ms (Max)

GND

N.C.

GND

N.C.

1 2 3

(BOTTOM VIEW)

µSOP

(DS18B20U)

18B20

TO-92

(DS18B20)

1-Wire is a registered trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

REV: 042208

DS18B20

bus is virtually unlimited. The 1-Wire bus protocol, including detailed explanations of the commands and

“time slots,” is covered in the

1-Wire Bus System

section.

Another feature of the DS18B20 is the ability to operate without an external power supply. Power is

instead supplied through the 1-Wire pullup resistor via the DQ pin when the bus is high. The high bus

signal also charges an internal capacitor (C

), which then supplies power to the device when the bus is

low. This method of deriving power from the 1-Wire bus is referred to as “parasite power.” As an

alternative, the DS18B20 may also be powered by an external supply on V

Figure 1. DS18B20 Block Diagram

4.7k

PARASITE POWER

CIRCUIT

MEMORY CONTROL

LOGIC

DS18B20

TEMPERATURE SENSOR

INTERNAL V

64-BIT ROM

AND

1-Wire PORT

ALARM HIGH TRIGGER (T

)

ALARM LOW TRIGGER (T

)

POWER-

SUPPLY

SENSE

CONFIGURATION REGISTER

(EEPROM)

8-BIT CRC GENERATOR

GND

SCRATCHPAD

The core functionality of the DS18B20 is its direct-to-digital temperature sensor. The resolution of the

temperature sensor is user-configurable to 9, 10, 11, or 12 bits, corresponding to increments of 0.5°C,

0.25°C, 0.125°C, and 0.0625°C, respectively. The default resolution at power-up is 12-bit. The DS18B20

powers up in a low-power idle state. To initiate a temperature measurement and A-to-D conversion, the

master must issue a Convert T [44h] command. Following the conversion, the resulting thermal data is

stored in the 2-byte temperature register in the scratchpad memory and the DS18B20 returns to its idle

state. If the DS18B20 is powered by an external supply, the master can issue “read time slots” (see the

1-Wire Bus System

section) after the Convert T command and the DS18B20 will respond by transmitting

0 while the temperature conversion is in progress and 1 when the conversion is done. If the DS18B20 is

powered with parasite power, this notification technique cannot be used since the bus must be pulled high

by a strong pullup during the entire temperature conversion. The bus requirements for parasite power are

explained in detail in the

Powering the DS18B20

section.

The DS18B20 output temperature data is calibrated in degrees Celsius; for Fahrenheit applications, a

lookup table or conversion routine must be used. The temperature data is stored as a 16-bit sign-extended

two’s complement number in the temperature register (see Figure 2). The sign bits (S) indicate if the

temperature is positive or negative: for positive numbers S = 0 and for negative numbers S = 1. If the

DS18B20 is configured for 12-bit resolution, all bits in the temperature register will contain valid data.

For 11-bit resolution, bit 0 is undefined. For 10-bit resolution, bits 1 and 0 are undefined, and for 9-bit

resolution bits 2, 1, and 0 are undefined. Table 1 gives examples of digital output data and the

corresponding temperature reading for 12-bit resolution conversions.

3 of 22

OPERATION—MEASURING TEMPERATURE

DS18B20

The master device can check the alarm flag status of all DS18B20s on the bus by issuing an Alarm Search

[ECh] command. Any DS18B20s with a set alarm flag will respond to the command, so the master can

determine exactly which DS18B20s have experienced an alarm condition. If an alarm condition exists

and the T

or T

settings have changed, another temperature conversion should be done to validate the

alarm condition.

POWERING THE DS18B20

The DS18B20 can be powered by an external supply on the V

pin, or it can operate in “parasite power”

mode, which allows the DS18B20 to function without a local external supply. Parasite power is very

useful for applications that require remote temperature sensing or that are very space constrained.

Figure 1 shows the DS18B20’s parasite-power control circuitry, which “steals” power from the 1-Wire

bus via the DQ pin when the bus is high. The stolen charge powers the DS18B20 while the bus is high,

and some of the charge is stored on the parasite power capacitor (C

) to provide power when the bus is

low. When the DS18B20 is used in parasite power mode, the V

pin must be connected to ground.

In parasite power mode, the 1-Wire bus and C

can provide sufficient current to the DS18B20 for most

operations as long as the specified timing and voltage requirements are met (see the

DC Electrical

Characteristics

and

AC Electrical Characteristics).

However, when the DS18B20 is performing

temperature conversions or copying data from the scratchpad memory to EEPROM, the operating current

can be as high as 1.5mA. This current can cause an unacceptable voltage drop across the weak 1-Wire

pullup resistor and is more current than can be supplied by C

. To assure that the DS18B20 has sufficient

supply current, it is necessary to provide a strong pullup on the 1-Wire bus whenever temperature

conversions are taking place or data is being copied from the scratchpad to EEPROM. This can be

accomplished by using a MOSFET to pull the bus directly to the rail as shown in Figure 4. The 1-Wire

bus must be switched to the strong pullup within 10µs (max) after a Convert T [44h] or Copy Scratchpad

[48h] command is issued, and the bus must be held high by the pullup for the duration of the conversion

CONV

) or data transfer (t

= 10ms). No other activity can take place on the 1-Wire bus while the pullup

is enabled.

The DS18B20 can also be powered by the conventional method of connecting an external power supply

to the V

pin, as shown in Figure 5. The advantage of this method is that the MOSFET pullup is not

required, and the 1-Wire bus is free to carry other traffic during the temperature conversion time.

The use of parasite power is not recommended for temperatures above +100°C since the DS18B20 may

not be able to sustain communications due to the higher leakage currents that can exist at these

temperatures. For applications in which such temperatures are likely, it is strongly recommended that the

DS18B20 be powered by an external power supply.

In some situations the bus master may not know whether the DS18B20s on the bus are parasite powered

or powered by external supplies. The master needs this information to determine if the strong bus pullup

should be used during temperature conversions. To get this information, the master can issue a Skip ROM

[CCh] command followed by a Read Power Supply [B4h] command followed by a “read time slot”.

During the read time slot, parasite powered DS18B20s will pull the bus low, and externally powered

DS18B20s will let the bus remain high. If the bus is pulled low, the master knows that it must supply the

strong pullup on the 1-Wire bus during temperature conversions.

5 of 22

DS18B20-SL-TR Related Products

	DS18B20-SL-TR	DS18B20X	DS18B20U
Description	Board Mount Temperature Sensors	Board Mount Temperature Sensors	Board Mount Temperature Sensors
Product Category	Board Mount Temperature Sensors	Board Mount Temperature Sensors	-
Manufacturer	Maxim	Maxim	-
Output Type	Digital	Digital	-
Configuration	Local	Local	-
Shutdown	No Shutdown	No Shutdown	-
Temperature Threshold	Programmable	Programmable	-
Product	Sensor with Alarm	Sensor with Alarm	-
Operating Supply Current	1.5 mA	1.5 mA	-

Recommended Resources

Cam controller starting circuit

Kilowatt level full-bridge conversion switching power supply circuit

High voltage step-down chopper stabilized power supply circuit

Gate control switch circuit

555 high voltage low current low power inverter circuit

Square-triangular wave oscillator that can be controlled over long distances

Several swords of IP integration: Introduction--As the convergence of networks for transmitting data, voice and video is gradually realized, people's understanding of the concept of convergence is gradually deepening. As the convergen...; maker RF/Wirelessly

Characteristics of high-efficiency LED driver circuits: 1. The similarities and differences between the lumen efficiency of a single LED and the lumen efficiency of a lamp using LED as a light source. For a specific LED, with a specified forward bias, for ...; qwqwqw2088 LED Zone

Does anyone want to take part in embedded training together?: Does anyone want to join the Gangwan embedded training? If yes, please contact QQ568689807. I have carefully compared them and found Gangwan is OK. It is cheap and similar in all aspects. They said th...; zdhm Embedded System

Questions about the encryption function of z-stack: Hello everyone. I am currently using the Z-Stack Home 1.2.0 protocol stack version, and I need to use the Zigbee encryption function. The method of use is to directly enable the SECURE option in the c...; Zigbee_App RF/Wirelessly

Notice on the extension of ON Semiconductor and Avnet IoT Innovation Design Competition: Notice on the extension of ON Semiconductor and Avnet IoT Innovation Design CompetitionDear contestants:We regret to inform you that the 2020-2021 ON Semiconductor and Avnet IoT Innovation Design Comp...; EEWORLD社区 onsemi and Avnet IoT Innovation Design Competition

I want to ask if all Keil C registration machines will be reported as Trojans?: Several versions of the registration machine have been reported as Trojans by anti-virus software. I wonder if it is a false positive....; liyanping Embedded System

What can domestic chips do to save you?

The most significant event in the technology circle during this period is undoubtedly the news that ZTE was banned by the United States. Once the news came out, it shocked the entire Chinese techno...[Details]
The US-China trade war is dragging down these tech giants

The Sino-US trade war has already started. Trump's series of actions have had a negative impact on the global economy, such as increasing tariffs on Chinese companies and restricting domestic compa...[Details]
In what aspects does China's BOE threaten the United States?

In the past few days, the Chinese display panel giant BOE has been flooded with articles supported by Liu Shuwei. Let's follow the embedded editor to learn about the relevant content. ...[Details]
STM32F4(KEY)

In the actual project development process, hardware circuits often need to be modified, and the modified parts need to modify the driver. Thinking about the coming and going of such requirements is t...[Details]
STM32F4 (read chip ID)

Unique device identifiers are suitable for: ● Used as a serial number (e.g. USB string serial number or other terminal applications) ● Use the unique ID as a security key when used in conjunction wit...[Details]
Is the “Chinese Chip” that Alibaba is going to make the one that can save China?

In simple terms, high-end chips solve many complex problems, mid-range chips solve a single complex problem, and low-end chips solve a simple problem. Let's learn more about the relevant content wi...[Details]
STM32CubeMX：PWM

Chip: STM32F103C8T6 Application Pin: Output: PA0, PA1 TIM2 CH2 channel To achieve 50HZ (20ms) adjustable PWM output on the PA1 pin, set the system TIMx_CNT=8MHZ=8000 000HZ, set TIMx_PSC=800-1, then T...[Details]
STM32F103 learning programming based on STM32CubeMX and Keil5

0. Preparation First use st-link to connect the stm32 core board and PC for burning St-link Stm32 3.3V 3.3V GND GND SWDIO PART SWCLK DCLK Then connect with USB serial port board to v...[Details]
STM32 IoT TFTP file transfer

Remarks: Focus on IoT application development and share IoT technology experience. Software platform: IAR6.5 TCP/IP protocol stack: LWIP1.4.1 Hardware platform: STM32F103C8T6 wired communication ...[Details]
STM32F407 and LAN8720 debug log (1)

LAN8720 test code arrangement 1. Modified based on two projects, namely "Experiment 55 Network Communication Experiment" of Zhengdian Atom ATK and "STSW-STM32070" routine of ST official The hardware ...[Details]
STM32 simple data transmission method and communication protocol (suitable for serial port and general bus)

introduction In the general project development process, two or more microcontrollers are often required to communicate to complete data transmission. For example, a quadcopter wirelessly transmits d...[Details]
STM32 FSMC usage--LCD

1. Basic Concepts of LCD/LCM The structure of Liquid Crystal Display (LCD) is to place liquid crystals between two parallel pieces of glass. There are many vertical and horizontal fine wires between...[Details]
At 5:30, the inverter is already working! A photovoltaic power station that works up to 14 hours a day gives you higher profits!

Our photovoltaic power station starts working at 5:30 in the morning. When you are still sleeping, the inverter starts working to make money! Some people are skeptical. The sun hasn't even...[Details]
Epson's 10-year journey in AR

The F1 racetrack is roaring with engines, and a fierce F1 race is about to begin. I am not a fan of racing cars, and I have nothing to do with this world, but I spent a special day here because...[Details]
The war in the flash memory camp has begun, who will win in 2018!

Analysts have sorted out some interesting phenomena. Let's follow the embedded editor to learn about the relevant content. Huawei emerged as a star in the all- flash array sales ra...[Details]

Shortcut: 00 01 02 03 04 05 06 07 08 09 0A 0C 0F 0J 0L 0M 0R 0S 0T 0Z 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 1H 1K 1M 1N 1P 1S 1T 1V 1X 1Z 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 2G 2K 2M 2N 2P 2Q 2R 2S 2T 2W 2Z 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 3G 3H 3J 3K 3L 3M 3N 3P 3R 3S 3T 3V 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4M 4N 4P 4S 4T 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5E 5G 5H 5K 5M 5N 5P 5S 5T 5V 60 61 62 63 64 65 66 67 68 69 6A 6C 6E 6F 6M 6N 6P 6R 6S 6T 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7M 7N 7P 7Q 7V 7W 7X 80 81 82 83 84 85 86 87 88 89 8A 8D 8E 8L 8N 8P 8S 8T 8W 8Y 8Z 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9F 9G 9H 9L 9S 9T 9W

Popular Components