Analog Devices is helping shape the future of healthcare with innovative technology and system expertise, their domain expertise combined with a comprehensive technology portfolio enables customers to create solutions that positively impact people’s lives. One such product is the ADT7422 high accuracy, digital I2C temperature sensor which has been designed to meet the clinical thermometry specification of the ASTM E1112 standards when soldered onto the final printed circuit board (PCB).
The ADT7422 device contains an internal band gap reference, a temperature sensor, and a precision analog-to-digital converter (ADC), the cost effective device can provide 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. Accuracy is specified at ±0.25°C over temperature range -20°C to +105°C and ±0.5°C over the full operating temperature range of -40°C to +125°C.
The accuracy of the ADT7422 digital temperature sensor makes it ideal for use in medical systems for measuring human body surface temperature such as vital signs monitoring (VSM) applications. Besides the obvious medical uses, the devices are also suited to access control applications to measure a person’s body temperature before allowing entry into the premises to help maintain a COVID safe environment.
Functional Block Diagram
Pin A0 and 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.
The device has a rated supply voltage range from 2.7V to 3.3V and when operating at a typical 3.0V the average supply current of the device is typically 210μA making the device very efficient and suitable for use in battery operated equipment. The ADT7422 also features a shutdown mode that powers down the device and offers a shutdown current of typically 2.0μA at 3.0 V. The ADT7422 is rated for operation over the −40°C to +125°C temperature range.
Evaluation Platform
The ADT7422 is supported by the EVAL-TempSense-ARDZ evaluation platform which contains three evaluation boards that allow easy evaluation of the functionality of Analog Devices precision digital temperature sensors. Interface to the sensors can be either directly on the Arduino shield or by ribbon cable connected to external sensors, the platform allows developers to easily evaluate the performance and features of the ADT7422 digital temperature sensor allowing quicker time to market for their designs.
The ADT7422 is available in the compact 4 x 4mm 16-Lead Lead Frame Chip Scale Package (LFCSP) and is suitable for a wide range of applications including refrigeration, thermocouples, vital signs monitoring, medical equipment, health monitors, access control, instrumentation, incubators and HVAC systems.
Anglia are offering customers a FREE Evaluation board and samples of the ADT7422 high accuracy digital temperature sensor from Analog Devices, please fill in the form below to register your interest now.
FREE samples for UK and Ireland customers only, subject to availability.
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