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ADT7312 の電気的特性と機能
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ADT7312のメーカーはAnalog Devicesです、この部品の機能は「Digital SPI Temperature Sensor」です。 |
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製品の詳細 ( Datasheet PDF )
| 部品番号 ADT7312 |
| 部品説明 Digital SPI Temperature Sensor |
| メーカ Analog Devices |
ロゴ |
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Data Sheet
Automotive, ±1°C Accurate, 16-Bit, 175°C,
Digital SPI Temperature Sensor in Die Form
ADT7312
FEATURES
Qualified for automotive applications
High performance
Temperature accuracy:
±1°C from −55°C to +175°C (2.7 V to 3.3 V)
16-bit temperature resolution: 0.0078°C
Fast first temperature conversion on power-up of 6 ms
Easy implementation
No temperature calibration or correction required
No linearity correction required
Low power
Power-saving 1 sample per second (SPS) mode
880 μW typical at 3.6 V in normal mode
9 μW typical at 3.6 V in shutdown mode
Wide operating ranges
Temperature range: −55°C to +175°C
Voltage range: 2.7 V to 5.5 V
Programmable interrupts
Critical overtemperature interrupt
Overtemperature/undertemperature interrupt
SPI-compatible interface
Available in die form only
APPLICATIONS
Automotive
High temperature monitoring
High temperature thermal protection
GENERAL DESCRIPTION
The ADT7312 is a ±1°C accurate digital temperature sensor
that operates over a very wide temperature range of −55°C to
+175°C and is available in die form only. It contains an internal
band gap reference, a temperature sensor, and a 16-bit analog-
to-digital converter (ADC) to monitor and digitize the temper-
ature to a resolution of 0.0078°C. The default ADC resolution
is 13 bits (0.0625°C). The ADC resolution can be changed to
16 bits (0.0078°C) using the serial interface.
The ADT7312 is guaranteed to operate over supply voltages
from 2.7 V to 5.5 V. At 3.6 V operation, the average supply
current is typically 245 μA. The ADT7312 has a shutdown
mode that powers down the device, resulting in a typical
shutdown current of 2.5 μA at 3.6 V. The ADT7312 is rated
for operation over the −55°C to +175°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 pin and
the CT pin can operate in either comparator or interrupt mode.
PRODUCT HIGHLIGHTS
1. Ease of use, no calibration or correction required.
2. Low power consumption.
3. Excellent long-term stability and reliability.
4. Qualified for automotive applications.
FUNCTIONAL BLOCK DIAGRAM
SCLK 1
DOUT 2
DIN 3
CS 4
INTERNAL
REFERENCE
INTERNAL
OSCILLATOR
TEMPERATURE
SENSOR
Σ-∆
MODULATOR
ADT7312
TCRIT
6 CT
THIGH
5 INT
FILTER
LOGIC
TLOW
7 GND
8 GND
CONFIGURATION
TCRIT
TLOW
STATUS
REGISTER
REGISTER REGISTER REGISTER
9 VDD
TEMPERATURE
VALUE
REGISTER
THYST
THIGH
ID
REGISTER REGISTER REGISTER
10 VDD
Figure 1.
Rev. A
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
©2012 Analog Devices, Inc. All rights reserved.
1 Page
ADT7312
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
Pad Configuration and Function Descriptions ............................ 6
Die Bond Pad Coordinates.............................................................. 7
Typical Performance Characteristics ............................................. 8
Theory of Operation ........................................................................ 9
Circuit Description....................................................................... 9
Converter Architecture................................................................ 9
Normal Mode (Continuous Conversion Mode) ...................... 9
One-Shot Mode .......................................................................... 10
1 SPS Mode.................................................................................. 11
Shutdown Mode.......................................................................... 11
Fault Queue ................................................................................. 11
Temperature Data Format ......................................................... 12
Temperature Conversion Formulas ......................................... 12
Registers ........................................................................................... 13
Status Register ............................................................................. 13
Configuration Register .............................................................. 14
REVISION HISTORY
6/12—Rev. 0 to Rev. A
Changed High Output Leakage Current, IOH Maximum
Parameter from 5 μA to ±1 μA ....................................................... 3
1/12—Revision 0: Initial Version
Data Sheet
Temperature Value Register ...................................................... 15
ID Register................................................................................... 15
TCRIT Setpoint Register ............................................................... 15
THYST Setpoint Register............................................................... 16
THIGH Setpoint Register .............................................................. 16
TLOW Setpoint Register ............................................................... 16
Serial Interface ................................................................................ 17
SPI Command Byte.................................................................... 17
Writing Data ............................................................................... 18
Reading Data............................................................................... 19
Interfacing to DSPs or Microcontrollers ................................. 19
Resetting the Serial Interface .................................................... 19
INT and CT Outputs...................................................................... 20
Undertemperature and Overtemperature Detection ............ 20
Redundant Critical Generator.................................................. 21
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. A | Page 2 of 24
3Pages
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
VDD to GND
DIN Input Voltage to GND
DOUT Output 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 Range
Storage Temperature Range
Maximum Junction Temperature, TJMAX
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
−55°C to +175°C
−65°C to +175°C
175°C
ADT7312
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. A | Page 5 of 24
6 Page
合計 : 25 ページ |
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