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Product Category: IC Chips
Manufacturer: Maxim Integrated
  datasheetDS18B20 Datasheet
Package: TO92
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Manufacturer: Maxim Integrated
Product Category: IC Chips
Series: -
Packaging: Bulk
Package-Case: TO-226-3, TO-92-3 (TO-226AA)
Operating-Temperature: -55°C ~ 125°C
Output-Type: 1-WireR
Features: Output Switch, Programmable Limit, Programmable Resolution
Voltage-Supply: 3 V ~ 5.5 V
Supplier-Device-Package: TO-92-3
Resolution: 11 b
Sensor-Type: Digital, Local
Test-Condition: -10°C ~ 85°C (-55°C ~ 125°C)
Sensing-Temperature-Local: -55°C ~ 125°C
Sensing-Temperature-Remote: -
Accuracy-Highest-Lowest: ±0.5°C (±2°C)
Features, Applications

Features, Applications


Unique 1-WireR interface requires only one port pin for communication Each device has a unique 64-bit serial code stored in an onboard ROM Multidrop capability simplifies distributed temperature sensing applications Requires no external components Can be powered from data line. Power supply range to 5.5V Measures temperatures from +257°F) ±0.5°C accuracy from to +85°C Thermometer resolution is user-selectable from to 12 bits Converts temperature to 12-bit digital word in 750ms (max.) User-definable nonvolatile (NV) alarm settings Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition) Available (150mil), 8-pin mSOP, 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

GND DQ VDD NC - Ground - Data In/Out - Power Supply Voltage - No Connect


The DS18B20 Digital Thermometer provides to 12-bit centigrade 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 to +125°C and is accurate to ±0.5°C over the range +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.

TO-92 SYMBOL DESCRIPTION 1 GND Ground. 2 DQ Data Input/Output pin. Open-drain 1-Wire interface pin. Also provides power to the device when used in parasite power mode (see "Parasite Power" section.) Optional VDD pin. VDD must be grounded for operation 8 3 VDD parasite power mode. *All pins not specified in this table are "No Connect" pins. mSOP* 4 1 SO* 5 4

Figure 1 shows a block diagram of the DS18B20, and pin descriptions are given in Table 1. The 64-bit ROM stores the device's unique serial code. The scratchpad memory contains the 2-byte temperature register that stores the digital output from the temperature sensor. In addition, the scratchpad provides access to the 1-byte upper and lower alarm trigger registers (TH and TL), and the 1-byte configuration register. The configuration register allows the user to set the resolution of the temperature-to-digital conversion or 12 bits. The TH, TL and configuration registers are nonvolatile (EEPROM), so they will retain data when the device is powered down. The DS18B20 uses Dallas' exclusive 1-Wire bus protocol that implements bus communication using one control signal. The control line requires a weak pullup resistor since all devices are linked to the bus via 3-state or open-drain port (the DQ pin in the case of the DS18B20). In this bus system, the microprocessor (the master device) identifies and addresses devices on the bus using each device's unique 64-bit code. Because each device has a unique code, the number of devices that can be addressed on one 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 of this datasheet. 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 (CPP), 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 VDD.


The core functionality of the DS18B20 is its direct-to-digital temperature sensor. The resolution of the temperature sensor is user-configurable or 12 bits, corresponding to increments 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 1WIRE 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 of this datasheet. The DS18B20 output temperature data is calibrated in degrees centigrade; for Fahrenheit applications, a lookup table or conversion routine must be used. The temperature data is stored 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 = 0 and for negative numbers 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 2 gives examples of digital output data and the corresponding temperature reading for 12-bit resolution conversions.

*The power-on reset value of the temperature register is +85°C 

Search Part number : "DS18B" Included word is 15
Part Number Manufacturer Package Quantity Description
DS18B20 TO-92 NS TO-92 550
DS18B20(7Q18B20) 7Q-TEK TO-92 53360
DS18B20+ Maxim Integrated TO-92 372016 SENSOR TEMPERATURE 1-WIRE TO92-3
DS18B20+PAR Maxim Integrated 5868 SENSOR TEMPERATURE 1-WIRE TO92-3
DS18B20+T&R Maxim Integrated 17516 SENSOR TEMPERATURE 1-WIRE TO92-3
DS18B20-SL+T.R 11060
DS18B20U MAXIM MSOP8 14421
DS18B20U+ Maxim Integrated 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) 18841 SENSOR TEMPERATURE 1-WIRE 8UMAX
DS18B20U+T MAXIM MSOP-8 15800
DS18B20U+T&R Maxim Integrated 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) 25513 SENSOR TEMPERATURE 1-WIRE 8UMAX
DS18B20U+TR MAXIM SOP-8 7412
DS18B20Z Maxim Integrated 8-SOIC (0.154", 3.90mm Width) 2304 SENSOR TEMPERATURE 1-WIRE 8SOIC
DS18B20Z+ Maxim Integrated 8-SOIC (0.154", 3.90mm Width) 10650 SENSOR TEMPERATURE 1-WIRE 8SOIC
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