Datasheet > DS1721

DS1721

更新时间： 2023-12-20 18:45:51

品牌	Logo	应用领域
亚德诺 - ADI		监控
页数	文件大小	规格书
17页	257K
描述
数字温度计和温度监控器

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DS1721 数据手册

DS1721

2-Wire Digital Thermometer

and Thermostat

www.maxim-ic.com

FEATURES

PIN ASSIGNMENT

CꢀTemperature measurements require no

external components with ±1°C accuracy

CꢀMeasures temperatures from -55°C to

+125°C; Fahrenheit equivalent is -67°F to

+257°F

SDA

V_DD

A₀

A₁

SDA

SCL

T_OUT

GND

SCL

T_OUT

A₀

A₁

A₂

CꢀTemperature resolution is configurable from 9

to 12 (default) bits (0.5°C to 0.0625°C

resolution)

GND

A₂

DS1721U

DS1721S

8-Pin SOIC (150-mil)

8-Pin µ-SOP

CꢀMaximum conversion time (9-bit resolution)

of 93.75 ms

PIN DESCRIPTION

CꢀThermostatic settings are user-definable

CꢀData is read/written via a 2-wire serial

interface (open drain I/O lines); 3-bit

addressability

SDA

SCL

GND

T_OUT

A₀

- 2-Wire Serial Data Input/Output

- 2-Wire Serial Clock

- Ground

- Thermostat Output Signal

- Chip Address Input

CꢀWide power supply range (2.7V - 5.5V)

CꢀApplications include personal computers,

cellular telephones, office equipment, or any

thermally sensitive system

A₁

- Chip Address Input

A₂

- Chip Address Input

V_DD

- Power Supply Voltage (+5V)

Cꢀ8-pin, 150-mil SOIC package and 8-pin µSOP

package

DESCRIPTION

The DS1721 2-Wire Digital Thermometer and Thermostat provides 12-bit temperature readings, which

indicate the temperature of the device. Thermostatic settings and temperature readings are all

communicated to/from the DS1721 over a simple 2-wire serial interface. No additional components are

required; the device is truly a “temperature-to-digital” converter.

The DS1721 has three address bits that allow a user to multidrop up to eight sensors along the 2-wire bus,

greatly simplifying the bussing of distributed temperature sensing networks.

The thermal alarm output, T_OUT, is active when the temperature of the device exceeds a user-defined

temperature TH. The output remains active until the temperature is equal to or below the user-defined

temperature TL, allowing for any hysteresis necessary. The active state of T_OUTis configurable by the

user.

For applications that require faster conversion times, the user can adjust the readout resolution from 12 to

9 bits, effectively reducing the conversion time from 750ms (MAX) to 93.75 ms (MAX). This is

particularly useful in applications where temperature changes large magnitudes very rapidly.

Applications for DS1721 include personal computers/services, cellular telephones, office equipment, or

any microprocessor-based, thermally sensitive system.

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