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ADT7311 の電気的特性と機能
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ADT7311のメーカーはAnalog Devicesです、この部品の機能は「16-Bit Digital SPI Temperature Sensor」です。 |
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製品の詳細 ( Datasheet PDF )
| 部品番号 ADT7311 |
| 部品説明 16-Bit Digital SPI Temperature Sensor |
| メーカ Analog Devices |
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Data Sheet
Automotive, ±0.5°C Accurate, 16-Bit
Digital SPI Temperature Sensor
ADT7311
FEATURES
GENERAL DESCRIPTION
Qualified for automotive applications
High performance
Temperature accuracy
±0.5°C from −40°C to +105°C (2.7 V to 3.6 V)
±0.4°C from −40°C to +105°C (3.0 V)
16-bit temperature resolution: 0.0078°C
Fast first conversion on power-up of 6 ms
Easy implementation
No temperature calibration/correction required by user
No linearity correction required
Low power
Power saving 1 sample per second (SPS) mode
700 μW typical at 3.3 V in normal mode
7 μW typical at 3.3 V in shutdown mode
Wide operating ranges
Temperature range: −40°C to +150°C
Voltage range: 2.7 V to 5.5 V
Programmable interrupts
Critical overtemperature interrupt
Overtemperature/undertemperature interrupt
SPI-compatible interface
8-lead narrow SOIC RoHS-compliant package
APPLICATIONS
Battery management
Climate control and infotainment
Lighting
Powertrain
Thermocouple cold junction compensation
GPS
The ADT7311 is a high accuracy digital temperature sensor
in a narrow 8-lead SOIC package. It contains a band gap
temperature reference and a 16-bit ADC to monitor and digitize
the temperature to a 0.0078°C resolution. The ADC resolution,
by default, is set to 13 bits (0.0625°C). The ADC resolution is a
user programmable mode that can be changed through the
serial interface.
The ADT7311 is guaranteed to operate over supply voltages from
2.7 V to 5.5 V. Operating at 3.3 V, the average supply current is
typically 210 μA. The ADT7311 has a shutdown mode that
powers down the device and offers a shutdown current of
typically 2 μA. The ADT7311 is rated for operation over the
−40°C to +150°C temperature range.
The CT pin is an open-drain output that becomes active when
the temperature exceeds a programmable critical temperature
limit. The default critical temperature limit is 147°C. The INT
pin is also an open-drain output that becomes active when the
temperature exceeds a programmable limit. The INT and CT
pins can operate in either comparator or interrupt mode.
PRODUCT HIGHLIGHTS
1. Ease of use, no calibration or correction required by the user.
2. Low power consumption.
3. Excellent long-term stability and reliability.
4. Packaged in an 8-lead SOIC, RoHS-compliant package.
FUNCTIONAL BLOCK DIAGRAM
SCLK 1
DOUT 2
DIN 3
CS 4
TEMPERATURE
VALUE
REGISTER
THYST
REGISTER
THIGH
REGISTER
INTERNAL
REFERENCE
INTERNAL
OSCILLATOR
CONFIGURATION,
STATUS, AND
ID REGISTERS
TEMPERATURE
SENSOR
TCRIT
REGISTER
TLOW
REGISTER
Σ-∆
MODULATOR
FILTER
LOGIC
ADT7311
TCRIT
THIGH
6 CT
5 INT
TLOW
7 GND
8 VDD
Figure 1.
Rev. 0
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2011 Analog Devices, Inc. All rights reserved.
1 Page
ADT7311
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
SPI Timing Specifications ........................................................... 4
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ........................................................................ 9
Circuit Information...................................................................... 9
Converter Details.......................................................................... 9
Temperature Measurement ......................................................... 9
One-Shot Mode .......................................................................... 10
1 SPS Mode.................................................................................. 10
Shutdown..................................................................................... 11
Fault Queue ................................................................................. 11
Temperature Data Format ......................................................... 12
Temperature Conversion Formulas ......................................... 12
Registers ........................................................................................... 13
Status Register ............................................................................. 13
REVISION HISTORY
9/11—Revision 0: Initial Version
Data Sheet
Configuration Register .............................................................. 14
Temperature Value Register ...................................................... 15
ID Register................................................................................... 15
TCRIT Setpoint Register ............................................................... 15
THYST Setpoint Register............................................................... 16
THIGH Setpoint Register .............................................................. 16
TLOW Setpoint Register ............................................................... 16
Serial Peripheral Interface ............................................................. 17
SPI Command Byte.................................................................... 17
Writing Data ............................................................................... 18
Reading Data............................................................................... 19
Interfacing to DSPs or Microcontrollers ................................. 19
Serial Interface Reset.................................................................. 19
INT and CT Outputs...................................................................... 20
Undertemperature and Overtemperature Detection ............ 20
Applications Information .............................................................. 22
Thermal Response Time ........................................................... 22
Supply Decoupling ..................................................................... 22
Powering from a Switching Regulator..................................... 22
Temperature Monitoring........................................................... 22
Quick Guide to Measuring Temperature ................................ 22
Outline Dimensions ....................................................................... 23
Ordering Guide .......................................................................... 23
Automotive Products ................................................................. 23
Rev. 0 | Page 2 of 24
3Pages
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
VDD to GND
DIN Input Voltage to GND
DOUT Voltage to GND
SCLK Input Voltage to GND
CS Input Voltage to GND
CT and INT Output Voltage to GND
ESD Rating (Human Body Model)
Operating Temperature Range1
Storage Temperature Range
Maximum Junction Temperature, TJMAX
8-Lead SOIC_N (R-8)
Power Dissipation2
Thermal Impedance4
θJA, Junction-to-Ambient (Still Air)
θJC, Junction-to-Case
IR Reflow Soldering
Peak Temperature (RoHS-Compliant
Package)
Time at Peak Temperature
Ramp-Up Rate
Ramp-Down Rate
Time from 25°C to Peak Temperature
Rating
−0.3 V to +7 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
2.0 kV
−40°C to +150°C
−65°C to +160°C
150°C
WMAX = (TJMAX − TA3)/θJA
121°C/W
56°C/W
220°C
260°C (0°C)
20 sec to 40 sec
3°C/sec maximum
−6°C/sec maximum
8 minutes maximum
1 Operating at extended temperatures over prolonged periods depends on
the lifetime performance of the part. Consult your local Analog Devices, Inc.,
account representative for more details.
2 Value relates to package being used on a standard 2-layer PCB. This gives a
worst-case θJA and θJC.
3 TA = ambient temperature.
4 Junction-to-case resistance is applicable to components featuring a
preferential flow direction, for example, components mounted on a heat
sink. Junction-to-ambient is more useful for air-cooled, PCB-mounted
components.
ADT7311
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. 0 | Page 5 of 24
6 Page
合計 : 25 ページ |
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