ADT7422CCPZ-RL7

±0.1°C Accuracy, 16-Bit, Digital I2C Temperature Sensor for VSM Applications ADT7422 Data Sheet FEATURES GENERAL DESCRIPTION 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 Low power 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 16-lead, 4 mm × 4 mm, RoHS compliant LFCSP 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). 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. 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. 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. 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) Laser diode temperature control PRODUCT HIGHLIGHTS 1. 2. 3. 4. No calibration or correction required by the user. Low power consumption. Long-term stability and reliability. High accuracy for industrial, instrumentation, and medical applications. FUNCTIONAL BLOCK DIAGRAM INTERNAL REFERENCE GND 11 TEMPERATURE SENSOR ADT7422 A0 3 A1 4 Σ-Δ MODULATOR FILTER LOGIC 10 CT 9 INT 1 SCL 2 SDA TCRIT THIGH TLOW I2C INTERFACE 20961-001 INTERNAL OSCILLATOR VDD 12 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 registered trademarks 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 ©2020 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com ADT7422 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Temperature Value Registers ................................................... 13 Applications ...................................................................................... 1 Status Register............................................................................. 14 General Description ......................................................................... 1 Configuration Register .............................................................. 14 Product Highlights ........................................................................... 1 THIGH Setpoint Registers............................................................. 15 Functional Block Diagram .............................................................. 1 TLOW Setpoint Registers ............................................................. 15 Revision History ............................................................................... 2 TCRIT Setpoint Registers ............................................................. 10 Specifications .................................................................................... 3 THYST Setpoint Register .............................................................. 15 I C Timing Specifications............................................................ 4 ID Register .................................................................................. 15 Absolute Maximum Ratings ........................................................... 5 Serial Interface ................................................................................ 16 Thermal Resistance ...................................................................... 5 Serial Bus Address ...................................................................... 16 ESD Caution.................................................................................. 5 Writing Data ............................................................................... 17 Pin Configuration and Function Descriptions ............................ 6 Reading Data............................................................................... 18 Typical Performance Characteristics ............................................. 7 Reset ............................................................................................. 19 Theory of Operation ........................................................................ 9 General Call ................................................................................ 19 Circuit Information ..................................................................... 9 INT and CT Outputs ..................................................................... 20 Converter Details ......................................................................... 9 Undertemperature and Overtemperature Detection ............ 20 Normal Mode................................................................................ 9 Applications Information ............................................................. 22 One Shot Mode ............................................................................. 9 Thermal Response Time ........................................................... 22 1 SPS Mode.................................................................................. 11 Supply Decoupling ..................................................................... 22 Shutdown Mode ......................................................................... 11 Powering from a Switching Regulator .................................... 22 Fault Queue ................................................................................. 11 Temperature Measurement ...................................................... 22 Temperature Data Format ........................................................ 12 Quick Guide to Measuring Temperature ............................... 22 Temperature Conversion Formulas ........................................ 12 Outline Dimensions ....................................................................... 23 Registers ........................................................................................... 13 Ordering Guide .......................................................................... 23 2 Address Pointer Register ........................................................... 13 REVISION HISTORY 4/2020—Rev. 0 to Rev. A Changes to Data Sheet Title, Features Section, and General Description Section .......................................................................... 1 Change to Accuracy Parameter, Table 1 ....................................... 3 1/2020—Revision 0: Initial Version Rev. A | Page 2 of 23 Data Sheet ADT7422 SPECIFICATIONS TA = −40°C to +125°C, VDD = 2.7 V to 3.3 V, unless otherwise noted. Table 1. Parameter TEMPERATURE SENSOR AND ADC Accuracy 1 Symbol Min Typ ADC Resolution Temperature Resolution 13-Bit 16-Bit Temperature Conversion Time Fast Temperature Conversion Time 1 SPS Mode Conversion Time Temperature Hysteresis 3 Repeatability Drift 4 DC Power Supply Rejection Ratio (PSRR) DIGITAL OUTPUTS (CT, INT, SDA— OPEN-DRAIN) High Output Leakage Current Output Low Voltage Output High Voltage Output Capacitance DIGITAL INPUTS (SCL, SDA, A0, A1) Input Current Input Low Voltage Input High Voltage IOH VOL VOH COUT Unit Test Conditions/Comments ±0.1 2 ±0.25 ±0.50 13 °C °C °C Bits 16 Bits TA = 25°C to 50°C, VDD = 3.0 V TA = −20°C to +105°C, VDD = 2.7 V to 3.3 V TA = −40°C to +125°C, VDD = 2.7 V to 3.3 V Twos complement temperature value of the sign bit plus 12 ADC bits Twos complement temperature value of the sign bit plus 15 ADC bit 0.0625 0.0078125 240 °C °C ms 6 60 ±0.002 ±0.015 0.0073 0.1 ms ms °C °C °C °C/V 0.1 ±1 0.3 × VDD 0.4 0.7 × VDD 2 50 2.7 µA V 13-bit resolution (sign + 12 bits) 16-bit resolution (sign + 15 bits) Continuous conversion and one-shot conversion modes First conversion on power-up only Conversion time for 1 SPS mode Temperature cycle = 25°C to 125°C to 25°C TA = 25°C, average of 10 readings 500-hour stress test at 150°C TA = 25°C CT pin and INT pin pulled up to VDD Low output leakage current (IOL) = 1 mA at 3.3 V V pF 2 VIL VIH 5 0.4 0.7 × VDD SCL and SDA Glitch Rejection Pin Capacitance POWER REQUIREMENTS Supply Voltage Supply Current 1 SPS Current Shutdown Current Power Dissipation Normal Mode Power Dissipation 1 SPS Power Dissipation Shutdown Mode Max µA V Input voltage (VIN) = 0 V to VDD SCL and SDA only V V V ns A0 and A1 only SCL and SDA only A0 and A1 only Input filtering suppresses noise spikes of