Datasheet ADT7320 (Analog Devices)

±0.25°C Accurate, 16-Bit Digital SPI Temperature Sensor Data Sheet ADT7320 FEATURES GENERAL DESCRIPTION High performance
The ADT7320 is a high accuracy digital temperature sensor that
Temperature accuracy
offers breakthrough performance over a wide industrial temperature
±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 at 2.7 V to 3.3 V
internal band gap reference, a temperature sensor, and a 16-bit
16-bit temperature resolution: 0.0078°C
analog-to-digital converter (ADC) to monitor and digitize the
Ultralow temperature drift: 0.0073°C
temperature to a resolution of 0.0078°C. The ADC resolution,
NIST traceable or equivalent
by default, is set to 13 bits (0.0625°C). The ADC resolution is a
Fast first temperature conversion on power-up of 6 ms
user programmable mode that can be changed through the
Easy implementation
serial interface.
No temperature calibration/correction required by user No linearity correction required
The ADT7320 is guaranteed to operate over supply voltages from
Low power
2.7 V to 5.5 V. Operating at 3.3 V, the average supply current is
Power saving 1 sample per second (SPS) mode
typical y 210 µA. The ADT7320 has a shutdown mode that powers
700 µW typical at 3.3 V in normal mode
down the device and offers a shutdown current of typical y 2.0 µA
7 µW typical at 3.3 V in shutdown mode
at 3.3 V. The ADT7320 is rated for operation over the −40°C to
Wide operating ranges
+150°C temperature range.
Temperature range: −40°C to +150°C Voltage range: 2.7 V to 5.5 V
The CT pin is an open-drain output that becomes active when the
Programmable interrupts
temperature exceeds a programmable critical temperature limit.
Critical overtemperature interrupt
The INT pin is also an open-drain output that becomes active
Overtemperature/undertemperature interrupt
when the temperature exceeds a programmable limit. The INT pin
SPI-compatible interface
and CT pin can operate in either comparator or interrupt mode.
16-lead, RoHS-compliant, 4 mm × 4 mm LFCSP 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, RoHS-compliant, 4 mm × 4 mm
Environmental monitoring and HVAC
LFCSP package.
Laser diode temperature control FUNCTIONAL BLOCK DIAGRAM TEMPERATURE ADT7320 VALUE REGISTER TLOW INTERNAL REGISTER OSCILLATOR INTERNAL REFERENCE CONFIGURATION THYST 10 CT REGISTER REGISTER TCRIT TCRIT STATUS REGISTER REGISTER TEMPERATURE Σ-Δ SENSOR MODULATOR 9 INT THIGH ID REGISTER REGISTER THIGH SCLK 1 FILTER DOUT 2 SPI LOGIC TLOW 11 GND DIN INTERFACE 3
001
12 VDD CS 4
09012- Figure 1.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION PRODUCT HIGHLIGHTS FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS SPI TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER DETAILS CONTINUOUS CONVERSION MODE ONE-SHOT MODE CT and INT Operation in One-Shot Mode 1 SPS MODE SHUTDOWN MODE 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 STATUS REGISTER CONFIGURATION REGISTER TEMPERATURE VALUE REGISTER ID REGISTER TCRIT SETPOINT REGISTER THYST SETPOINT REGISTER THIGH SETPOINT REGISTER TLOW SETPOINT REGISTER SERIAL INTERFACE SPI COMMAND BYTE WRITING DATA READING DATA INTERFACING TO DSPs OR MICROCONTROLLERS SERIAL INTERFACE RESET 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