Automotive, 0.5C 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
0.5C from 40C to +105C (2.7 V to 3.6 V)
the temperature to a 0.0078C resolution. The ADC resolution,
0.4C from 40C to +105C (3.0 V)
by default, is set to 13 bits (0.0625C). The ADC resolution is a
16-bit temperature resolution: 0.0078C
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 A. 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 W typical at 3.3 V in normal mode
typically 2 A. The ADT7311 is rated for operation over the
7 W typical at 3.3 V in shutdown mode
40C to +150C temperature range.
Wide operating ranges
The CT pin is an open-drain output that becomes active when
Temperature range: 40C to +150C
the temperature exceeds a programmable critical temperature
Voltage range: 2.7 V to 5.5 V
limit. The default critical temperature limit is 147C. The INT
Programmable interrupts
pin is also an open-drain output that becomes active when the
Critical overtemperature interrupt
temperature exceeds a programmable limit. The INT and CT
Overtemperature/undertemperature interrupt
pins can operate in either comparator or interrupt mode.
SPI-compatible interface
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
1
SCLK
ADT7311
2 INTERNAL
DOUT
OSCILLATOR
INTERNAL
3
DIN REFERENCE
6 CT
4 T
CS
CRIT
-
TEMPERATURE
MODULATOR
TEMPERATURE CONFIGURATION, SENSOR
5 INT
VALUE STATUS, AND
REGISTER ID REGISTERS
T
HIGH
T T
HYST CRIT
FILTER
REGISTER REGISTER
LOGIC
7 GND
T
LOW
T
T
HIGH LOW
REGISTER REGISTER V
8
DD
Figure 1.
Rev. 0
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SPI INTERFACE
09050-001ADT7311 Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1 Configuration Register .............................................................. 14
Applications....................................................................................... 1 Temperature Value Register...................................................... 15
General Description ......................................................................... 1 ID Register................................................................................... 15
Product Highlights ........................................................................... 1 TCRIT Setpoint Register ............................................................... 15
Functional Block Diagram .............................................................. 1 T Setpoint Register............................................................... 16
HYST
Revision History ............................................................................... 2 T Setpoint Register .............................................................. 16
HIGH
Specifications..................................................................................... 3 T Setpoint Register ............................................................... 16
LOW
SPI Timing Specifications ........................................................... 4 Serial Peripheral Interface ............................................................. 17
Absolute Maximum Ratings............................................................ 5 SPI Command Byte.................................................................... 17
ESD Caution.................................................................................. 5 Writing Data ............................................................................... 18
Pin Configuration and Function Descriptions............................. 6 Reading Data............................................................................... 19
Typical Performance Characteristics ............................................. 7 Interfacing to DSPs or Microcontrollers................................. 19
Theory of Operation ........................................................................ 9 Serial Interface Reset.................................................................. 19
Circuit Information...................................................................... 9 INT and CT Outputs...................................................................... 20
Converter Details.......................................................................... 9 Undertemperature and Overtemperature Detection ............ 20
Temperature Measurement ......................................................... 9 Applications Information .............................................................. 22
One-Shot Mode .......................................................................... 10 Thermal Response Time ........................................................... 22
1 SPS Mode.................................................................................. 10 Supply Decoupling ..................................................................... 22
Shutdown..................................................................................... 11 Powering from a Switching Regulator..................................... 22
Fault Queue ................................................................................. 11 Temperature Monitoring........................................................... 22
Temperature Data Format......................................................... 12 Quick Guide to Measuring Temperature ................................ 22
Temperature Conversion Formulas ......................................... 12 Outline Dimensions....................................................................... 23
Registers ........................................................................................... 13 Ordering Guide .......................................................................... 23
Status Register............................................................................. 13 Automotive Products................................................................. 23
REVISION HISTORY
9/11Revision 0: Initial Version
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