DS1720S-TR datasheet, PDF - EEWORLD Datasheet

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DS1720S-TR: DescriptionBoard Mount Temperature Sensors Digital Thermometer u0026 Thermostat; CategoryThe sensor; File Size171KB，14 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS1720S-TR Overview

Board Mount Temperature Sensors Digital Thermometer u0026 Thermostat

DS1720S-TR Parametric

Parameter Name	Attribute value
Product Category	Board Mount Temperature Sensors
Manufacturer	Maxim
RoHS	Details
Output Type	Digital
Configuration	Local
Accuracy	+/- 2.5 C
Maximum Operating Temperature	+ 125 C
Minimum Operating Temperature	- 55 C
Interface Type	3-Wire, Microwire, SPI
Resolution	12 bit
Supply Voltage - Max	5.5 VDC
Supply Voltage - Min	2.7 VDC
Shutdown	No Shutdown
Temperature Threshold	Programmable
Mounting Style	SMD/SMT
Package / Case	SOIC-8
Product	Thermometer Thermostat
Packaging	Cut Tape
Packaging	MouseReel
Packaging	Reel
Operating Supply Current	1 mA
Factory Pack Quantity	2000

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DS1720

ECON-Digital Thermometer and

Thermostat

www.maxim-ic.com

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

CLK/CONV

RST

GND

HIGH

LOW

COM

DS1720S 8-Pin SOIC (208-mil)

PIN DESCRIPTION

CLK/

CONV

– 3–Wire Input/Output

– 3–Wire Clock Input and

Stand–alone

Convert Input

– 3–Wire Reset Input

– Ground

– High Temperature Trigger

– Low Temperature Trigger

– High/Low Combination Trigger

– Power Supply Voltage (3V-5V)

RST

GND

HIGH

LOW

COM

DESCRIPTION

The DS1720 Digital Thermometer and Thermostat provides 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.

HIGH

is driven high if the DS1720’s temperature is greater than or equal to a user–defined temperature

. T

LOW

is driven high if the DS1720’s temperature is less than or equal to a user–defined temperature

. T

COM

is driven high when the temperature exceeds T

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.

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020106

DS1720

ORDER INFORMATION

ORDERING

NUMBER

DS1720S+

DS1720S+T&R

PACKAGE

MARKING

DS1720 (see note)

DESCRIPTION

DS1720 in Lead-Free 208mil 8-pin SO

DS1720 in Lead-Free 208mil 8-pin SO, 2500 Piece

Tape-and-Reel

DS1720S

DS1720

DS1720 in 208mil 8-pin SO

DS1720S/T&R

DS1720

DS1720 in 208mil 8-pin SO, 2500 Piece Tape-and-Reel

Note: A “+” symbol will also be marked on the package near the Pin 1 indicator.

OPERATION–MEASURING TEMPERATURE

A block diagram of the DS1720 is shown in Figure 1. The DS1720 measures temperatures through the

use of an on–board proprietary temperature measurement technique. A block diagram of the temperature

measurement circuitry is shown in Figure 2.

The DS1720 measures temperature by counting the number of clock cycles that an oscillator with a low

temperature coefficient goes through during a gate period determined by a high temperature coefficient

oscillator. The counter is preset with a base count that corresponds to –55°C. If the counter reaches zero

before the gate period is over, the temperature register, which is also preset to the –55°C value, is

incremented, indicating that the temperature is higher than –55°C. At the same time, the counter is then

preset with a value determined by the slope accumulator circuitry. This circuitry is needed to compensate

for the parabolic behavior of the oscillators over temperature. The counter is then clocked again until it

reaches zero. If the gate period is still not finished, then this process repeats.

The slope accumulator is used to compensate for the nonlinear behavior of the oscillators over

temperature, yielding a high resolution temperature measurement. This is done by changing the number

of counts necessary for the counter to go through for each incremental degree in temperature. To obtain

the desired resolution, therefore, both the value of the counter and the number of counts per degree C (the

value of the slope accumulator) at a given temperature must be known.

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