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DS1820S Datasheet

  • DS1820S

  • DS1820.DS1820S Digital Thermometer Replacements

  • 21頁(yè)

  • ETC

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DS18S20
High Precision
1-Wire
廬
Digital Thermometer
www.dalsemi.com
FEATURES
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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
Multi-drop 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 鈥?5擄C to
+125擄C (鈥?7擄F to +257擄F)
鹵0.5擄C
accuracy from 鈥?0擄C to +85擄C
9-bit thermometer resolution
Converts temperature in 750 ms (max.)
User-definable nonvolatile alarm settings
Alarm search command identifies and
addresses devices whose temperature is
outside of programmed limits (temperature
alarm condition)
Applications include thermostatic controls,
industrial systems, consumer products,
thermometers, or any thermally sensitive
system
PIN ASSIGNMENT
DALLAS
DS1820
1 2 3
V
DD
DQ
3
4
NC
NC
1
8
NC
NC
NC
GND
DS1820
2
7
6
5
8-pin 150-mil SOIC
(DS18S20Z)
(BOTTOM VIEW)
鈥?/div>
TO-92
(DS18S20)
PIN DESCRIPTION
GND
DQ
V
DD
NC
- Ground
- Data In/Out
- Power Supply Voltage
- No Connect
DESCRIPTION
The DS18S20 Digital Thermometer provides 9鈥揵it centigrade temperature measurements and has an
alarm function with nonvolatile user-programmable upper and lower trigger points. The DS18S20
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 鈥?5擄C to +125擄C
and is accurate to
鹵0.5擄C
over the range of 鈥?0擄C to +85擄C. In addition, the DS18S20 can derive power
directly from the data line (鈥減arasite power鈥?, eliminating the need for an external power supply.
Each DS18S20 has a unique 64-bit serial code, which allows multiple DS18S20s to function on the same
1鈥搘ire bus; thus, it is simple to use one microprocessor to control many DS18S20s 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 of 21
043001
GND
DQ
V
DD
1 2
3

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