1-Wire Digital Thermometer DS1820
npn smd transistor
,multi emitter transistor
FEATURES PIN ASSIGNMENT
• Unique 1–WireTM interface requires only one port pin
for communication
• Multidrop capability simplifies distributed temperature
sensing applications
• Requires no external components
• Can be powered from data line
• Zero standby power required
• Measures temperatures from –55°C to +125°C in
0.5°C increments. Fahrenheit equivalent is –67°F to
+257°F in 0.9°F increments
• Temperature is read as a 9–bit digital value.
• Converts temperature to digital word in 200 ms (typ.)
• User–definable, nonvolatile temperature alarm set-
tings
• Alarm search command identifies and addresses
devices whose temperature is outside of pro-
grammed limits (temperature alarm condition)
• Applications include thermostatic controls, industrial
systems, consumer products, thermometers, or any
thermally sensitive system
PIN DESCRIPTION
GND – Ground
DQ – Data In/Out
VDD – Optional VDD
NC – No Connect
DESCRIPTION
The DS1820 Digital Thermometer provides 9–bit tem-
perature readings which indicate the temperature of the
device.
Information is sent to/from the DS1820 over a 1–Wire
interface, so that only one wire (and ground) needs to be
connected from a central microprocessor to a DS1820.
Power for reading, writing, and performing temperature
conversions can be derived from the data line itself
with no need for an external power source.
Because each DS1820 contains a unique silicon serial
number, multiple DS1820s can exist on the same
1–Wire bus. This allows for placing temperature sen-
sors in many different places. Applications where this
feature is useful include HVAC environmental controls,
sensing temperatures inside buildings, equipment or
machinery, and in process monitoring and control.
DS1820 BLOCK DIAGRAM Figure 1
0402 0.063W 10kOhm SMT Thick Film Chip Resistor RC0402JR-0710KL
200MHz MPZ1608S300ATAH0 Chip Beads 5A For Power Line TDK SMD0603
22R 5% SMD0402 Film Chip Resistors ERJ-2GEJ220X PANASONIC
MOV-20D751K 750V 6.5kA Varistor blue SMD Chip Resistor 1 Circuit Through Hole Disc 20mm
2SB1261-TP 10W General Purpose Rectifier Diode Silicon Epitaxial Planar Pnp Transistor
IXFK140N30P Polar Power Mosfet Hiperfet TO264 300V 140A
DF2B29FU,H3F TVS 24VWM 47V ESD Protection Diodes
PMEG6010ER 1A Low VF MEGA Schottky Barrier Rectifier SOD123
SK34SMA 3A SMD Schottky Barrier Rectifier Diodes DO - 214AC
SMBJ5.0A Silicon Avalanche Diodes 600W Surface Mount TVS Diodes
| Image | Part # | Description | |
|---|---|---|---|
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|
0402 0.063W 10kOhm SMT Thick Film Chip Resistor RC0402JR-0710KL |
10 kOhms ±5% 0.063W, 1/16W Chip Resistor 0402 (1005 Metric) Moisture Resistant Thick Film
|
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200MHz MPZ1608S300ATAH0 Chip Beads 5A For Power Line TDK SMD0603 |
30 Ohms 1 Power Line Ferrite Bead 0603 (1608 Metric) 5A 10mOhm
|
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|
22R 5% SMD0402 Film Chip Resistors ERJ-2GEJ220X PANASONIC |
22 Ohms ±5% 0.1W, 1/10W Chip Resistor 0402 (1005 Metric) Automotive AEC-Q200 Thick Film
|
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MOV-20D751K 750V 6.5kA Varistor blue SMD Chip Resistor 1 Circuit Through Hole Disc 20mm |
750 V 6.5 kA Varistor 1 Circuit Through Hole Disc 20mm
|
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2SB1261-TP 10W General Purpose Rectifier Diode Silicon Epitaxial Planar Pnp Transistor |
Bipolar (BJT) Transistor PNP 60 V 3 A 50MHz 1 W Surface Mount D-Pak
|
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|
IXFK140N30P Polar Power Mosfet Hiperfet TO264 300V 140A |
N-Channel 300 V 140A (Tc) 1040W (Tc) Through Hole TO-264AA (IXFK)
|
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|
DF2B29FU,H3F TVS 24VWM 47V ESD Protection Diodes |
47V Clamp 3A (8/20µs) Ipp Tvs Diode Surface Mount USC
|
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|
PMEG6010ER 1A Low VF MEGA Schottky Barrier Rectifier SOD123 |
Diode 60 V 1A Surface Mount SOD-123W
|
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SK34SMA 3A SMD Schottky Barrier Rectifier Diodes DO - 214AC |
Diode 40 V 3A Surface Mount DO-214AC, SMA
|
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SMBJ5.0A Silicon Avalanche Diodes 600W Surface Mount TVS Diodes |
9.2V Clamp 65.3A Ipp Tvs Diode Surface Mount DO-214AA (SMBJ)
|