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DS18B20-PAR Datasheet

  • DS18B20-PAR

  • 1-Wire Parasite-Power Digital Thermometer

  • 19頁

  • MAXIM   MAXIM

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DS18B20-PAR
1-Wire Parasite-Power
Digital Thermometer
www.maxim-ic.com
FEATURES
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Unique 1-Wire interface requires only one
port pin for communication
Derives power from data line (鈥減arasite
power鈥?鈥攄oes not need a local power supply
Multi-drop capability simplifies distributed
temperature sensing applications
Requires no external components
鹵0.5擄C
accuracy from 鈥?0擄C to +85擄C
Measures temperatures from 鈥?5擄C to
+100擄C (鈥?7擄F to +212擄F)
Thermometer resolution is user-selectable
from 9 to 12 bits
Converts temperature to 12-bit digital word in
750 ms (max.)
User鈥揹efinable non-volatile temperature
alarm settings
Alarm search command identifies and
addresses devices whose temperature is
outside of programmed limits (temperature
alarm condition)
Software compatible with the DS1822-PAR
Ideal for use in remote sensing applications
(e.g., temperature probes) that do not have a
local power source
廬
PIN ASSIGNMENT
DALLAS
18B20P
1 2 3
(BOTTOM VIEW)
TO-92
(DS18B20-PAR)
PIN DESCRIPTION
GND - Ground
DQ
- Data In/Out
NC
- No Connect
DESCRIPTION
The DS18B20-PAR digital thermometer provides 9 to 12鈥揵it centigrade temperature measurements and
has an alarm function with nonvolatile user-programmable upper and lower trigger points. The
DS18B20-PAR does not need an external power supply because it derives power directly from the data
line (鈥減arasite power鈥?. The DS18B20-PAR communicates over a 1-Wire bus, which by definition
requires only one data line (and ground) for communication with a central microprocessor. It has an
operating temperature range of 鈥?5擄C to +100擄C and is accurate to
鹵0.5擄C
over a range of 鈥?0擄C to
+85擄C.
Each DS18B20-PAR has a unique 64-bit identification code, which allows multiple DS18B20-PARs to
function on the same 1鈥搘ire bus; thus, it is simple to use one microprocessor to control many DS18B20-
PARs 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.
1-Wire is a registered trademark of Dallas Semiconductor.
1 of 19
GND
DQ
NC
1 2
3
111903

DS18B20-PAR 產(chǎn)品屬性

  • Maxim Integrated Products

  • Sensor with Alarm

  • Local

  • Digital

  • +/- 2 C

  • Programmable

  • 1-Wire

  • 5.5 V

  • 3 V

  • + 125 C

  • - 55 C

  • No

  • Through Hole

  • TO-92-3

  • Digital Thermometer

  • 12 bit

  • 4.95 mm

  • 4.95 mm

  • 3 V to 5.5 V

  • - 55 C to + 125 C

  • DS18B20

  • 1.5 mA

  • 3.94 mm

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