±0.25°C Accurate, 16-Bit Digital
Data Sheet
Rev. 0 Document Feedback
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FEATURES
High performance
Temperature accuracy
±0.20°C from −10°C to +85°C at 3.0 V
±0.25°C from −20°C to +105°C at 2.7 V to 3.3 V
16-bit temperature resolution: 0.0078°C
Ultralow temperature drift: 0.0073°C
NIST traceable or equivalent
Fast first temperature 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
16-lead, RoHS-compliant, 4 mm × 4 mm LFCSP package
APPLICATIONS
RTD and thermistor replacement
Thermocouple cold junction compensation
Medical equipment
Industrial control and test
Food transportation and storage
Environmental monitoring and HVAC
Laser diode temperature control
GENERAL DESCRIPTION
The ADT7320 is a high accuracy digital temperature sensor that
offers breakthrough performance over a wide industrial temperature
range, housed in a 4 mm × 4 mm LFCSP package. It contains an
internal band gap reference, a temperature sensor, and a 16-bit
analog-to-digital converter (ADC) to monitor and digitize the
temperature to a resolution of 0.0078°C. 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 ADT7320 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 ADT7320 has a shutdown mode that powers
down the device and offers a shutdown current of typically 2.0 µA
at 3.3 V. The ADT7320 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 INT pin is also an open-drain output that becomes active
when the temperature exceeds a programmable limit. The INT pin
and CT pin 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. High accuracy for industrial, instrumentation, and medical
applications.
5. Packaged in a 16-lead, RoHS-compliant, 4 mm × 4 mm
LFCSP package.
FUNCTIONAL BLOCK DIAGRAM
INTERNAL
REFERENCE
12
11
TEMPERATURE
SENSOR
T
HIGH
T
CRIT
T
LOW
INTERNAL
OSCILLATOR
FILTER
LOGIC
Σ-Δ
MODULATOR
V
DD
GND
10
9
CT
INT
ADT7320
TEMPERATURE
VALUE
REGISTER
CONFIGURATION
REGISTER
T
HYST
REGISTER
T
LOW
REGISTER
T
HIGH
REGISTER
T
CRIT
REGISTER
ID
REGISTER
STATUS
REGISTER
1
2
SCLK
DOUT
3
4
DIN
CS
SPI
INTERFACE
09012-001
Figure 1.
