ADT7320_11 Datasheet, PDF (1/24 Pages) Analog Devices – ±0.25°C Accurate, 16-Bit Digital SPI Temperature Sensor

Data Sheet
±0.25°C Accurate, 16-Bit Digital
SPI Temperature Sensor
ADT7320
FEATURES
GENERAL DESCRIPTION
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
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.
No linearity correction required
The ADT7320 is guaranteed to operate over supply voltages from
Low power
2.7 V to 5.5 V. Operating at 3.3 V, the average supply current is
Power saving 1 sample per second (SPS) mode
typically 210 µA. The ADT7320 has a shutdown mode that powers
700 µW typical at 3.3 V in normal mode
down the device and offers a shutdown current of typically 2.0 µA
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
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.
16-lead, RoHS-compliant, 4 mm × 4 mm LFCSP package
PRODUCT HIGHLIGHTS
APPLICATIONS
RTD and thermistor replacement
Thermocouple cold junction compensation
Medical equipment
Industrial control and test
Food transportation and storage
Environmental monitoring and HVAC
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.
Laser diode temperature control
FUNCTIONAL BLOCK DIAGRAM
TEMPERATURE
VALUE
REGISTER
CONFIGURATION
REGISTER
T_CRIT
REGISTER
T_HIGH
REGISTER
T_LOW
REGISTER
T_HYST
REGISTER
STATUS
REGISTER
ID
REGISTER
INTERNAL
REFERENCE
INTERNAL
OSCILLATOR
TEMPERATURE
SENSOR
Σ-Δ
MODULATOR
ADT7320
T_CRIT
T_HIGH
10 CT
9 INT
SCLK 1
DOUT 2
DIN 3
CS 4
SPI
INTERFACE
FILTER
LOGIC
T_LOW
11 GND
12 V_DD
Figure 1.
Rev. 0
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