Datasheet ADT7311 (Analog Devices)

Automotive, ±0.5°C Accurate, 16-Bit Digital SPI Temperature Sensor Data Sheet ADT7311 FEATURES GENERAL DESCRIPTION Qualified for automotive applications
The ADT7311 is a high accuracy digital temperature sensor
High performance
in a narrow 8-lead SOIC package. It contains a band gap
Temperature accuracy
temperature reference and a 16-bit ADC to monitor and digitize
±0.5°C from −40°C to +105°C (2.7 V to 3.6 V)
the temperature to a 0.0078°C resolution. The ADC resolution,
±0.4°C from −40°C to +105°C (3.0 V)
by default, is set to 13 bits (0.0625°C). The ADC resolution is a
16-bit temperature resolution: 0.0078°C
user programmable mode that can be changed through the
Fast first conversion on power-up of 6 ms
serial interface.
Easy implementation No temperature calibration/correction required by user
The ADT7311 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
Low power
typically 210 μA. The ADT7311 has a shutdown mode that
Power saving 1 sample per second (SPS) mode
powers down the device and offers a shutdown current of
700 μW typical at 3.3 V in normal mode
typically 2 μA. The ADT7311 is rated for operation over the
7 μW typical at 3.3 V in shutdown mode
−40°C to +150°C temperature range.
Wide operating ranges Temperature range: −40°C to +150°C
The CT pin is an open-drain output that becomes active when
Voltage range: 2.7 V to 5.5 V
the temperature exceeds a programmable critical temperature
Programmable interrupts
limit. The default critical temperature limit is 147°C. The INT
Critical overtemperature interrupt
pin is also an open-drain output that becomes active when the
Overtemperature/undertemperature interrupt
temperature exceeds a programmable limit. The INT and CT
SPI-compatible interface
pins can operate in either comparator or interrupt mode.
8-lead narrow SOIC RoHS-compliant package PRODUCT HIGHLIGHTS APPLICATIONS
1. Ease of use, no calibration or correction required by the user.
Battery management
2. Low power consumption.
Climate control and infotainment
3. Excellent long-term stability and reliability.
Lighting
4. Packaged in an 8-lead SOIC, RoHS-compliant package.
Powertrain Thermocouple cold junction compensation GPS FUNCTIONAL BLOCK DIAGRAM SCLK 1 E ADT7311 AC 2 DOUT INTERNAL RF E OSCILLATOR T INTERNAL 3 N DIN REFERENCE I I 6 CT P 4 S CS TCRIT TEMPERATURE Σ-∆ TEMPERATURE CONFIGURATION, SENSOR MODULATOR 5 VALUE STATUS, AND INT REGISTER ID REGISTERS THIGH T T HYST CRIT FILTER REGISTER REGISTER LOGIC 7 T GND LOW T T HIGH LOW
1
REGISTER REGISTER 8 VDD
-00 50 90 0 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 TEMPERATURE MEASUREMENT ONE-SHOT MODE 1 SPS MODE CT and INT Operation in One-Shot 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 STATUS REGISTER CONFIGURATION REGISTER TEMPERATURE VALUE REGISTER ID REGISTER TCRIT SETPOINT REGISTER THYST SETPOINT REGISTER THIGH SETPOINT REGISTER TLOW SETPOINT REGISTER SERIAL PERIPHERAL 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 MONITORING QUICK GUIDE TO MEASURING TEMPERATURE OUTLINE DIMENSIONS ORDERING GUIDE AUTOMOTIVE PRODUCTS