Digital Thermometer. DS18B20 Datasheet

DS18B20 Thermometer. Datasheet pdf. Equivalent


Maxim Integrated DS18B20
Click here for production status of specific part numbers.
DS18B20
Programmable Resolution
1-Wire Digital Thermometer
General Description
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.
Applications
● Thermostatic Controls
● Industrial Systems
● Consumer Products
● Thermometers
● Thermally Sensitive Systems
Ordering Information appears at end of data sheet.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
Benefits and Features
● Unique 1-Wire® Interface Requires Only One Port
Pin for Communication
● Reduce Component Count with Integrated
Temperature Sensor and EEPROM
• Measures Temperatures from -55°C to +125°C
(-67°F to +257°F)
• ±0.5°C Accuracy from -10°C to +85°C
• 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 Programmed Limits
● Available in 8-Pin SO (150 mils), 8-Pin µSOP, and
3-Pin TO-92 Packages
Pin Configurations
DS18B20
1 23
GND DQ VDD
1 23
TOP VIEW
N.C. 1
N.C. 2
VDD 3
DQ 4
+
DS18B20
8 N.C.
7 N.C.
6 N.C.
5 GND
SO (150 mils)
(DS18B20Z)
DQ 1
N.C. 2
N.C. 3
GND 4
+
DS18B20
8 VDD
7 N.C.
6 N.C.
5 N.C.
1
BOTTOM VIEW
TO-92
(DS18B20)
µSOP
(DS18B20U)
19-7487; Rev 6; 7/19


DS18B20 Datasheet
Recommendation DS18B20 Datasheet
Part DS18B20
Description 1-Wire Digital Thermometer
Feature DS18B20; Click here for production status of specific part numbers. DS18B20 Programmable Resolution 1-Wire D.
Manufacture Maxim Integrated
Datasheet
Download DS18B20 Datasheet




Maxim Integrated DS18B20
DS18B20
Programmable Resolution
1-Wire Digital Thermometer
Absolute Maximum Ratings
Voltage Range on Any Pin Relative to Ground.....-0.5V to +6.0V
Operating Temperature Range.......................... -55°C to +125°C
Storage Temperature Range............................. -55°C to +125°C
Solder Temperature................................Refer to the IPC/JEDEC
J-STD-020 Specification.
These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure
to absolute maximum rating conditions for extended periods of time may affect reliability.
DC Electrical Characteristics
(-55°C to +125°C; VDD = 3.0V to 5.5V)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply Voltage
Pullup Supply Voltage
VDD
Local power (Note 1)
Parasite power
VPU
Local power
(Notes 1, 2)
-10°C to +85°C
+3.0
+3.0
+3.0
+5.5
V
+5.5
V
VDD
±0.5
Thermometer Error
tERR
-30°C to +100°C
-55°C to +125°C
(Note 3)
±1
°C
±2
Input Logic-Low
Input Logic-High
VIL
(Notes 1, 4, 5)
Local power
VIH
Parasite power
(Notes 1,6)
-0.3
+2.2
+3.0
+0.8
V
The lower
of 5.5 or
V
VDD + 0.3
Sink Current
Standby Current
Active Current
DQ Input Current
Drift
IL
IDDS
IDD
IDQ
VI/O = 0.4V
(Notes 7, 8)
VDD = 5V (Note 9)
(Note 10)
(Note 11)
4.0
mA
750 1000
nA
1
1.5
mA
5
µA
±0.2
°C
Note 1: All voltages are referenced to ground.
Note 2: The Pullup Supply Voltage specification assumes that the pullup device is ideal, and therefore the high level of the
Note 3:
pullup is equal to VPU. In order to meet the VIH spec of the DS18B20, the actual supply rail for the strong pullup transis-
tor must include margin for the voltage drop across the transistor when it is turned on; thus: VPU_ACTUAL = VPU_IDEAL +
VTRANSISTOR.
See typical performance curve in Figure 1. Thermometer Error limits are 3-sigma values.
Note 4: Logic-low voltages are specified at a sink current of 4mA.
Note 5: To guarantee a presence pulse under low voltage parasite power conditions, VILMAX may have to be reduced to as low as
0.5V.
Note 6: Logic-high voltages are specified at a source current of 1mA.
Note 7: Standby current specified up to +70°C. Standby current typically is 3µA at +125°C.
Note 8: To minimize IDDS, DQ should be within the following ranges: GND ≤ DQ ≤ GND + 0.3V or VDD – 0.3V ≤ DQ ≤ VDD.
Note 9: Active current refers to supply current during active temperature conversions or EEPROM writes.
Note 10: DQ line is high (“high-Z” state).
Note 11: Drift data is based on a 1000-hour stress test at +125°C with VDD = 5.5V.
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Maxim Integrated 2



Maxim Integrated DS18B20
DS18B20
Programmable Resolution
1-Wire Digital Thermometer
AC Electrical Characteristics–NV Memory
(-55°C to +125°C; VDD = 3.0V to 5.5V)
PARAMETER
NV Write Cycle Time
EEPROM Writes
EEPROM Data Retention
SYMBOL
tWR
NEEWR
tEEDR
CONDITIONS
-55°C to +55°C
-55°C to +55°C
AC Electrical Characteristics
(-55°C to +125°C; VDD = 3.0V to 5.5V)
PARAMETER
SYMBOL
CONDITIONS
9-bit resolution
Temperature Conversion Time
tCONV
10-bit resolution
11-bit resolution
(Note 12)
12-bit resolution
Time to Strong Pullup On
Time Slot
Recovery Time
Write 0 Low Time
Write 1 Low Time
Read Data Valid
Reset Time High
Reset Time Low
Presence-Detect High
Presence-Detect Low
Capacitance
tSPON
tSLOT
tREC
tLOW0
tLOW1
tRDV
tRSTH
tRSTL
tPDHIGH
tPDLOW
CIN/OUT
Start convert T command issued
(Note 12)
(Note 12)
(Note 12)
(Note 12)
(Note 12)
(Note 12)
(Notes 12, 13)
(Note 12)
(Note 12)
Note 12: See the timing diagrams in Figure 2.
Note 13: Under parasite power, if tRSTL > 960µs, a power-on reset can occur.
MIN TYP MAX UNITS
2
10
ms
50k
writes
10
years
MIN TYP MAX UNITS
93.75
187.5
ms
375
750
10
µs
60
120
µs
1
µs
60
120
µs
1
15
µs
15
µs
480
µs
480
µs
15
60
µs
60
240
µs
25
pF
DS18B20 TYPICAL ERROR CURVE
0.5
0.4
0.3
+3s ERROR
0.2
0.1
0
-0.1
-0.2
-3s ERROR
-0.3
MEAN ERROR
-0.4
-0.5
0
10
20
30
40
50
60
70
TEMPERATURE (°C)
Figure 1. Typical Performance Curve
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Maxim Integrated 3





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