Datasheet > ADT7422

ADT7422

更新时间： 2024-11-23 14:58:15

品牌	Logo	应用领域
亚德诺 - ADI		温度传感传感器温度传感器
页数	文件大小	规格书
23页	411K
描述
适用于 VSM 应用的精度为 ±0.1°C 的 16 位数字 I2C?温度传感器

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数据手册

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ADT7422 数据手册

0.1°C Accuracy, 16-Bit, Digital I²C

Temperature Sensor for VSM Applications

Data Sheet

ADT7422

FEATURES

GENERAL DESCRIPTION

The ADT7422 is a high accuracy, digital I²C temperature sensor

designed to meet the clinical thermometry specification of the

ASTM E1112 standards when soldered onto the final printed

circuit board (PCB).

Accuracy meets clinical thermometry specification of the

ASTM E1112 when soldered onto the final PCB

0.1°C from 25°C to 50°C at 3.0 V

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

Ultralow temperature drift: 0.0073°C

National Institute of Standards and Technology (NIST)

traceable or equivalent

Fast first temperature conversion at power-up of 6 ms

Simple implementation

No temperature calibration or correction required

No linearity correction required

The ADT7422 contains an internal band gap reference, a

temperature sensor, and a precision analog-to-digital converter

(ADC). The ADT7422 provides a 16-bit temperature result

with a resolution of 0.0078°C and an accuracy of up to 0.1°C

across the temperature range of 25°C to 50°C without the need

for calibration after the PCB soldering process.

Low power

Operating at 3.0 V, the average supply current is typically 210 μA.

The ADT7422 has a shutdown mode that powers down the

device and offers a shutdown current of typically 2.0 μA at 3.0 V.

The ADT7422 is rated for operation over the −40°C to +125°C

temperature range.

140 µW typical at 3.0 V in 1 SPS mode

6 µW typical at 3.0 V in shutdown mode

Programmable interrupts

Critical overtemperature interrupt

Overtemperature and undertemperature interrupt

I²C-compatible interface

Pin A0 and Pin A1 are available for address selection and provide

four possible I²C addresses for the ADT7422. 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

temperature exceeds a programmable limit. The INT pin and

CT pin can operate in comparator and interrupt event modes.

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

APPLICATIONS

Vital signs monitoring (VSM)

Medical equipment

Resistance temperature detector (RTD) and thermistor

replacement

Food transportation and storage

Thermocouple cold junction compensation

Environmental monitoring and heating, ventilation, and air

conditioning (HVAC)

PRODUCT HIGHLIGHTS

1. No calibration or correction required by the user.

2. Low power consumption.

3. Long-term stability and reliability.

4. High accuracy for industrial, instrumentation, and medical

applications.

Laser diode temperature control

FUNCTIONAL BLOCK DIAGRAM

INTERNAL

OSCILLATOR

10 CT

CRIT

INTERNAL

REFERENCE

INT

Σ-Δ

TEMPERATURE

SENSOR

HIGH

LOW

MODULATOR

GND

ADT7422

FILTER

LOGIC

SCL

SDA

I C INTERFACE

Figure 1.

Rev. A

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

rights of third parties that may result from its 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 and registeredtrademarks are the property oftheir 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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