±0.25°C Accurate, 16-Bit Digital IC Temperature Sensor

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 typically 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 temperature exceeds a programmable limit. The INT pin and CT pin can operate in comparator and interrupt event modes.

Product Highlights

* Ease of use, no calibration or correction required by the user.

* Low power consumption.

* Excellent long-term stability and reliability.

* High accuracy for industrial, instrumentation, and medical

applications.

* Packaged in a 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

* 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