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ADT7312 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADT7312
Beschreibung Digital SPI Temperature Sensor
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 25 Seiten
ADT7312 Datasheet, Funktion
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.






ADT7312 Datasheet, Funktion
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









ADT7312 pdf, datenblatt
Data Sheet
ADT7312
TEMPERATURE
149°C
148°C
147°C
146°C
145°C
144°C
143°C
142°C
141°C
140°C
139°C
CT PIN
POLARITY =
ACTIVE LOW
CT PIN
POLARITY =
ACTIVE HIGH
TCRIT
TCRIT – THYST
TIME
WRITE 01 TO
WRITE 01 TO
BITS[6:5] OF
BITS[6:5] OF
CONFIGURATION CONFIGURATION
REGISTER*
REGISTER*
WRITE 01 TO
BITS[6:5] OF
CONFIGURATION
REGISTER*
*AFTER WRITING TO THE CONFIGURATION REGISTER TO START A ONE-SHOT
CONVERSION, THE CONVERSION TIME IS 240ms. THEREFORE, IT TAKES AT
LEAST 240ms AFTER THE WRITE TO THE CONFIGURATION REGISTER
BEFORE THE CT PIN BECOMES ACTIVE.
Figure 12. CT Pin Operation in One-Shot Mode
1 SPS MODE
In 1 SPS mode, the part performs one measurement per second.
A conversion takes only 60 ms, and the part remains in the idle
state for the remaining 940 ms period. To enable 1 SPS mode, set
Bits[6:5] of the configuration register (Register Address 0x01)
to 10.
SHUTDOWN MODE
The ADT7312 can be placed in shutdown mode by setting Bits[6:5]
of the configuration register (Register Address 0x01) to 11. The
ADT7312 can be taken out of shutdown mode by setting Bits[6:5]
to 00 in the configuration register. The ADT7312 typically takes
1 ms (with a 0.1 µF decoupling capacitor) to come out of shutdown
mode. The conversion result from the last conversion prior to
shutdown can still be read from the ADT7312 even when it is
in shutdown mode.
When the part is taken out of shutdown mode, the internal clock
is restarted and a conversion is initiated.
FAULT QUEUE
Bits[1:0] of the configuration register (Register Address 0x01)
are used to configure the fault queue. Up to four faults are pro-
vided to prevent false tripping of the INT and CT pins when
the ADT7312 is used in a noisy temperature environment. The
number of faults set in the queue must occur consecutively to
set the INT and CT outputs.
For example, if the fault queue is set to four, four consecutive
temperature conversion results must exceed a temperature
limit before the INT or CT pin is activated. If two consecutive
temperature conversions exceed a temperature limit but the
third conversion does not exceed a limit, the fault count is reset
to zero.
Rev. A | Page 11 of 24

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