Datasheet ADT7420 (Analog Devices)

±0.25°C Accurate, 16-Bit Digital I2C Temperature Sensor Data Sheet ADT7420 FEATURES GENERAL DESCRIPTION High performance
The ADT7420 is a high accuracy digital temperature sensor
Temperature accuracy
offering breakthrough performance over a wide industrial
±0.20°C from −10°C to +85°C at 3.0 V
range, housed in a 4 mm × 4 mm LFCSP package. It contains an
±0.25°C from −20°C to +105°C from 2.7 V to 3.3 V
internal band gap reference, a temperature sensor, and a 16-bit
16-bit resolution: 0.0078°C
ADC to monitor and digitize the temperature to 0.0078°C
Ultralow temperature drift: 0.0073°C
resolution. The ADC resolution, by default, is set to 13 bits
NIST traceable or equivalent
(0.0625°C). The ADC resolution is a user programmable mode
Fast first temperature conversion on power-up of 6 ms
that can be changed through the serial interface.
Easy implementation No temperature calibration/correction required by user
The ADT7420 is guaranteed to operate over supply voltages from
No linearity correction required
2.7 V to 5.5 V. Operating at 3.3 V, the average supply current is typi-
Low power
cally 210 μA. The ADT7420 has a shutdown mode that powers
Power-saving 1 sample per second (SPS) mode
down the device and offers a shutdown current of typical y 2.0 μA
700 µW typical at 3.3 V in normal mode
at 3.3 V. The ADT7420 is rated for operation over the −40°C to
7 µW typical at 3.3 V in shutdown mode
+150°C temperature range.
Wide operating ranges
Pin A0 and Pin A1 are available for address selection, giving the
Temperature range: −40°C to +150°C
ADT7420 four possible I2C addresses. The CT pin is an open-
Voltage range: 2.7 V to 5.5 V
drain output that becomes active when the temperature exceeds
Programmable interrupts
a programmable critical temperature limit. The INT pin is also
Critical overtemperature interrupt
an open-drain output that becomes active when the tempera-
Overtemperature/undertemperature interrupt
ture exceeds a programmable limit. The INT pin and CT pin
I2C-compatible interface
can operate in comparator and interrupt event modes.
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.
RTD and thermistor replacement
2. Low power consumption.
Thermocouple cold junction compensation
3. Excellent long-term stability and reliability.
Medical equipment
4. High accuracy for industrial, instrumentation, and medical
Industrial control and test
applications.
Food transportation and storage
5. Packaged in a 16-lead, 4 mm × 4 mm LFCSP RoHS-
Environmental monitoring and HVAC
compliant package.
Laser diode temperature control FUNCTIONAL BLOCK DIAGRAM V 12 DD CONFIGURATION TEMPERATURE INTERNAL 10 CT REGISTER VALUE REGISTER OSCILLATOR TCRIT INTERNAL TLOW TCRIT REFERENCE REGISTER REGISTER 9 INT T Σ-Δ HYST THIGH TEMPERATURE T REGISTER REGISTER SENSOR MODULATOR HIGH ID STATUS REGISTER REGISTER ADT7420 FILTER T SOFTWARE POINTER LOW LOGIC RESET REGISTER REGISTER A0 3 1 SCL I2C INTERFACE A1 4 2 SDA 11
001
GND
09013- Figure 1.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION PRODUCT HIGHLIGHTS FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS I2C TIMING SPECIFICATIONS Timing Diagram ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER DETAILS NORMAL MODE ONE-SHOT MODE CT and INT Operation in One-Shot Mode 1 SPS MODE SHUTDOWN FAULT QUEUE TEMPERATURE DATA FORMAT TEMPERATURE CONVERSION FORMULAS 16-Bit Temperature Data Format 13-Bit Temperature Data Format 10-Bit Temperature Data Format 9-Bit Temperature Data Format REGISTERS ADDRESS POINTER REGISTER TEMPERATURE VALUE REGISTERS STATUS REGISTER CONFIGURATION REGISTER THIGH SETPOINT REGISTERS TLOW SETPOINT REGISTERS TCRIT SETPOINT REGISTERS THYST SETPOINT REGISTER ID REGISTER SERIAL INTERFACE SERIAL BUS ADDRESS WRITING DATA READING DATA RESET GENERAL CALL INT AND CT OUTPUTS UNDERTEMPERATURE AND OVERTEMPERATURE DETECTION Comparator Mode Interrupt Mode APPLICATIONS INFORMATION THERMAL RESPONSE TIME SUPPLY DECOUPLING POWERING FROM A SWITCHING REGULATOR TEMPERATURE MEASUREMENT QUICK GUIDE TO MEASURING TEMPERATURE OUTLINE DIMENSIONS ORDERING GUIDE