Datasheet > ADT7420_12

ADT7420_12

更新时间： 2024-11-22 12:51:55

品牌	Logo	应用领域
亚德诺 - ADI		传感器温度传感器
页数	文件大小	规格书
24页	419K
描述
Â±0.25Â°C Accurate, 16-Bit Digital I2C Temperature Sensor

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ADT7420_12 数据手册

0.25°C Accurate, 16-Bit Digital

I²C Temperature Sensor

Data Sheet

ADT7420

FEATURES

GENERAL DESCRIPTION

High performance

Temperature accuracy

The ADT7420 is a high accuracy digital temperature sensor

offering breakthrough performance over a wide industrial range,

housed in a 4 mm × 4 mm LFCSP package. It contains an internal

band gap reference, a temperature sensor, and a 16-bit ADC to

monitor and digitize the temperature to 0.0078°C resolution.

The ADC resolution, by default, is set to 13 bits (0.0625°C).

The ADC resolution is a user programmable mode that can be

changed through the serial interface.

0.20°C from −10°C to +85°C at 3.0 V

0.25°C from −20°C to +105°C from 2.7 V to 3.3 V

16-bit resolution: 0.0078°C

Ultralow temperature drift: 0.0073°C

NIST traceable or equivalent

Fast first temperature conversion on power-up of 6 ms

Easy implementation

The ADT7420 is guaranteed to operate over supply voltages from

2.7 V to 5.5 V. Operating at 3.3 V, the average supply current is typi-

cally 210 μA. The ADT7420 has a shutdown mode that powers

down the device and offers a shutdown current of typically 2.0 μA

at 3.3 V. The ADT7420 is rated for operation over the −40°C to

+150°C temperature range.

No temperature calibration/correction required by user

No linearity correction required

Low power

Power-saving 1 sample per second (SPS) mode

700 µW typical at 3.3 V in normal mode

7 µW typical at 3.3 V in shutdown mode

Wide operating ranges

Temperature range: −40°C to +150°C

Voltage range: 2.7 V to 5.5 V

Programmable interrupts

Pin A0 and Pin A1 are available for address selection, giving the

ADT7420 four possible I²C addresses. The CT pin is an open-

drain output that becomes active when the temperature exceeds

a programmable critical temperature limit. The INT pin is also

an open-drain output that becomes active when the tempera-

ture exceeds a programmable limit. The INT pin and CT pin

can operate in comparator and interrupt event modes.

Critical overtemperature interrupt

Overtemperature/undertemperature interrupt

I²C-compatible interface

16-lead, 4 mm × 4 mm LFCSP RoHS-compliant package

PRODUCT HIGHLIGHTS

APPLICATIONS

1. Ease of use, no calibration or correction required by the user.

2. Low power consumption.

3. Excellent long-term stability and reliability.

4. High accuracy for industrial, instrumentation, and medical

applications.

RTD and thermistor replacement

Thermocouple cold junction compensation

Medical equipment

Industrial control and test

Food transportation and storage

Environmental monitoring and HVAC

Laser diode temperature control

5. Packaged in a 16-lead, 4 mm × 4 mm LFCSP RoHS-

compliant package.

FUNCTIONAL BLOCK DIAGRAM

10 CT

CONFIGURATION

TEMPERATURE

INTERNAL

VALUE REGISTER

OSCILLATOR

CRIT

INTERNAL

CRIT

LOW

REFERENCE

INT

Σ-Δ

MODULATOR

TEMPERATURE

SENSOR

HYST

HIGH

LOW

STATUS

ADT7420

FILTER

LOGIC

SOFTWARE

RESET REGISTER

POINTER

SCL

SDA

I C INTERFACE

GND

Figure 1.

Rev. 0

Document Feedback

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rightsof third parties that may result fromits use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks andregisteredtrademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Technical Support

www.analog.com

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