0.1°C Accuracy, 16-Bit, Digital I2C
Temperature Sensor for VSM Applications
Data Sheet
ADT7422
FEATURES
GENERAL DESCRIPTION
The ADT7422 is a high accuracy, digital I2C temperature sensor
designed to meet the clinical thermometry specification of the
ASTM E1112 standards when soldered onto the final printed
circuit board (PCB).
Accuracy meets clinical thermometry specification of the
ASTM E1112 when soldered onto the final PCB
0.1°C from 25°C to 50°C at 3.0 V
0.25°C from −20°C to +105°C at 2.7 V to 3.3 V
Ultralow temperature drift: 0.0073°C
National Institute of Standards and Technology (NIST)
traceable or equivalent
Fast first temperature conversion at power-up of 6 ms
Simple implementation
No temperature calibration or correction required
No linearity correction required
The ADT7422 contains an internal band gap reference, a
temperature sensor, and a precision analog-to-digital converter
(ADC). The ADT7422 provides a 16-bit temperature result
with a resolution of 0.0078°C and an accuracy of up to 0.1°C
across the temperature range of 25°C to 50°C without the need
for calibration after the PCB soldering process.
Low power
Operating at 3.0 V, the average supply current is typically 210 μA.
The ADT7422 has a shutdown mode that powers down the
device and offers a shutdown current of typically 2.0 μA at 3.0 V.
The ADT7422 is rated for operation over the −40°C to +125°C
temperature range.
140 µW typical at 3.0 V in 1 SPS mode
6 µW typical at 3.0 V in shutdown mode
Programmable interrupts
Critical overtemperature interrupt
Overtemperature and undertemperature interrupt
I2C-compatible interface
Pin A0 and Pin A1 are available for address selection and provide
four possible I2C addresses for the ADT7422. 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 comparator and interrupt event modes.
16-lead, 4 mm × 4 mm, RoHS compliant LFCSP
APPLICATIONS
Vital signs monitoring (VSM)
Medical equipment
Resistance temperature detector (RTD) and thermistor
replacement
Food transportation and storage
Thermocouple cold junction compensation
Environmental monitoring and heating, ventilation, and air
conditioning (HVAC)
PRODUCT HIGHLIGHTS
1. No calibration or correction required by the user.
2. Low power consumption.
3. Long-term stability and reliability.
4. High accuracy for industrial, instrumentation, and medical
applications.
Laser diode temperature control
FUNCTIONAL BLOCK DIAGRAM
INTERNAL
OSCILLATOR
10 CT
12
11
V
DD
T
CRIT
INTERNAL
REFERENCE
9
INT
Σ-Δ
TEMPERATURE
SENSOR
T
T
HIGH
LOW
MODULATOR
GND
ADT7422
FILTER
LOGIC
1
2
3
4
SCL
SDA
A0
A1
2
I C INTERFACE
Figure 1.
Rev. A
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Devices. Trademarks and registeredtrademarks are the property oftheir respective owners.
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Technical Support
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