Automotive, ± ±1° Aꢀꢀuꢁrte, ±ꢂ6-it, ±ꢃ71°,
Digitrl SPI Tempeꢁrtuꢁe Sensoꢁ in Die Foꢁm
Drtr Sheet
ADTꢃ3±2
FEATURES
GENERAL DES°RIPTION
Qualified for automotive applications
High performance
Temperature accuracy:
1ꢀ° from −55ꢀ° to +175ꢀ° (2.7 V to 3.3 V)
16-bit temperature resolution: 0.0078ꢀ°
The ADT7312 is a 1ꢀ° aꢁꢁurate digital temperature sensor
that operates over a very wide temperature range of −55ꢀ° to
+175ꢀ° and is available in die form only. It ꢁontains an internal
band gap referenꢁe, a temperature sensor, and a 16-bit analog-
to-digital ꢁonverter (AD°) to monitor and digitize the temper-
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: −55ꢀ° to +175ꢀ°
Voltage range: 2.7 V to 5.5 V
ature to a resolution of 0.0078ꢀ°. The default AD° resolution
is 13 bits (0.0625ꢀ°). The AD° resolution ꢁan be ꢁhanged to
16 bits (0.0078ꢀ°) using the serial interfaꢁe.
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
ꢁurrent is typiꢁally 245 μA. The ADT7312 has a shutdown
mode that powers down the deviꢁe, resulting in a typiꢁal
shutdown ꢁurrent of 2.5 μA at 3.6 V. The ADT7312 is rated
for operation over the −55ꢀ° to +175ꢀ° temperature range.
The °T pin is an open-drain output that beꢁomes aꢁtive when
the temperature exꢁeeds a programmable ꢁritiꢁal temperature
limit. The default ꢁritiꢁal temperature limit is 147ꢀ°. The INT
pin is also an open-drain output that beꢁomes aꢁtive when the
temperature exꢁeeds a programmable limit. The INT pin and
the °T pin ꢁan operate in either ꢁomparator or interrupt mode.
Programmable interrupts
°ritical overtemperature interrupt
Overtemperature/undertemperature interrupt
SPI-compatible interface
Available in die form only
PRODU°T HIGHLIGHTS
APPLI°ATIONS
1. Ease of use, no ꢁalibration or ꢁorreꢁtion required.
2. Low power ꢁonsumption.
3. Exꢁellent long-term stability and reliability.
4. Qualified for automotive appliꢁations.
Automotive
High temperature monitoring
High temperature thermal protection
FUN°TIONAL BLO°K DIAGRAM
ADT7312
INTERNAL
REFERENCE
INTERNAL
OSCILLATOR
1
SCLK
6
CT
T
CRIT
2
3
4
DOUT
DIN
Σ-∆
MODULATOR
TEMPERATURE
SENSOR
INT
5
7
T
HIGH
CS
FILTER
LOGIC
GND
GND
T
LOW
8
9
CONFIGURATION
REGISTER
T
T
STATUS
CRIT
REGISTER
LOW
REGISTER REGISTER
V
DD
DD
10
V
TEMPERATURE
VALUE
REGISTER
T
T
ID
HYST
REGISTER
HIGH
REGISTER REGISTER
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.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2012 Analog Devices, Inc. All rights reserved.
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