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DS1820

1–Wire™ Digital Thermometer

Dallas Semiconductor -> Maxim Integrated 

DS1820

DS1820

1–WireTM Digital Thermometer

FEATURES

• 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 ASSIGNMENT

DDAALLLALSAS

DDSS18224034

1 23

1 23

BOTTOM VIEW

DS1820

PR35 PACKAGE

See Mech. Drawings

Section

NC

1

NC

2

NC

3

NC

4

NC

5

NC

6

VDD

7

DQ

8

16

NC

15

NC

14

NC

13

NC

12

NC

11

NC

10

NC

9

GND

DS1820S

16–PIN SSOP

See Mech. Drawings

Section

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.

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