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ADT7420 Datasheet PDF : 24 Pages
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Data Sheet
±0.25°C Accurate, 16-Bit Digital
I2C Temperature Sensor
ADT7420
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 from 2.7 V to 3.3 V
16-bit 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
I2C-compatible interface
16-lead, 4 mm × 4 mm LFCSP RoHS-compliant 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 ADT7420 is a high accuracy digital temperature sensor
offering breakthrough performance over a wide industrial
range, housed in a 4 mm × 4 mm LFCSP package. It contains an
internal band gap reference, a temperature sensor, and a 16-bit
ADC to monitor and digitize the temperature to 0.0078°C
resolution. 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 ADT7420 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 typi-
cally 210 μA. The ADT7420 has a shutdown mode that powers
down the device and offers a shutdown current of typically 2.0 μA
at 3.3 V. The ADT7420 is rated for operation over the −40°C to
+150°C temperature range.
Pin A0 and Pin A1 are available for address selection, giving the
ADT7420 four possible I2C addresses. 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 tempera-
ture exceeds a programmable limit. The INT pin and CT pin
can operate in comparator and interrupt event modes.
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, 4 mm × 4 mm LFCSP RoHS-
compliant package.
VDD 12
A0 3
A1 4
CONFIGURATION
REGISTER
TLOW
REGISTER
THYST
REGISTER
ID
REGISTER
SOFTWARE
RESET REGISTER
FUNCTIONAL BLOCK DIAGRAM
TEMPERATURE
VALUE REGISTER
TCRIT
REGISTER
THIGH
REGISTER
STATUS
REGISTER
POINTER
REGISTER
INTERNAL
REFERENCE
TEMPERATURE
SENSOR
ADT7420
INTERNAL
OSCILLATOR
Σ-Δ
MODULATOR
FILTER
LOGIC
I2C INTERFACE
11
GND
Figure 1.
TCRIT
THIGH
TLOW
10 CT
9 INT
1 SCL
2 SDA
Rev. A
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