DS1720 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS1720

Econo – Digital Thermometer and Thermostat

Dallas Semiconductor -> Maxim Integrated 

DS1720

PRELIMINARY

DS1720

Econo – Digital Thermometer and

Thermostat

FEATURES

• Requires no external components

• Supply voltage range covers from 2.7V to 5.5V

• 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 value

• Converts temperature to digital word in 1 second

(max)

• Thermostatic settings are user–definable and non–

volatile

• Data is read from/written via a 3–wire serial interface

(CLK, DQ, RST)

• Applications include thermostatic controls, industrial

systems, consumer products, thermometers, or any

thermally sensitive system

• 8–pin SOIC (208 mil) package

PIN ASSIGNMENT

DQ

1

8

VDD

CLK/CONV

2

7

THIGH

RST

3

6

TLOW

GND

4

5

TCOM

DS1720S 8–PIN SOIC (208 MIL)

See Mech Drawings Section

PIN DESCRIPTION

DQ

– 3–Wire Input/Output

CLK/CONV – 3–Wire Clock Input and

Stand–alone

Convert Input

RST

– 3–Wire Reset Input

GND

– Ground

THIGH

TLOW

TCOM

VDD

– High Temperature Trigger

– Low Temperature Trigger

– High/Low Combination Trigger

– Power Supply Voltage (3V – 5V)

DESCRIPTION

The DS1720 Digital Thermometer and Thermostat pro-

vides 9–bit temperature readings which indicate the

temperature of the device. With three thermal alarm out-

puts, the DS1720 can also act as a thermostat. THIGH is

driven high if the DS1720’s temperature is greater than

or equal to a user–defined temperature TH. TLOW is

driven high if the DS1720’s temperature is less than or

equal to a user–defined temperature TL. TCOM is driven

high when the temperature exceeds TH and stays high

until the temperature falls below that of TL.

User–defined temperature settings are stored in non–

volatile memory, so parts can be programmed prior to

insertion in a system, as well as used in stand–alone

applications without a CPU. Temperature settings and

temperature readings are all communicated to/from the

DS1720 over a simple 3–wire interface.

030598 1/12

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