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ADT7420:  ±0.25°C Accurate, 16-Bit Digital I2C Temperature Sensor

Product Details

Product Status:Recommended for New Designs

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.
Applications
  • RTD and thermistor replacement
  • Cold junction compensation
  • Medical equipment
  • Industrial control and test
  • Food transportation and storage
  • Environmental monitoring and HVAC
  • Laser diode temperature control

FEATURES and BENEFITS

  • 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
  • See data sheet for additonal features

Functional Block Diagram for ADT7420

Similar Products

  • ADT7320: ±0.25°C Accurate, 16-Bit Digital SPI Temperature Sensor
  • ADT7410: ±0.5°C Accurate, 16-Bit Digital I2C Temperature Sensor
  • ADT7310: ±0.5°C Accurate, 16-Bit Digital SPI Temperature Sensor

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Documentation

Title Content Type File Type
ADT7420: ±0.25°C Accurate, 16-Bit Digital I2C Temperature Sensor Data Sheet (Rev 0, 12/2012) (pdf, 411 kB) Data Sheets PDF
ADT7320 / ADT7420: High Accuracy Digital Temp Sensors
The ADT7320 (SPI I/F) and the ADT7420 (I2C I/F) are high accuracy digital temperature sensors that offer 0.25C accuracy from -20C to 105C. No calibration is required for these 16 bit resolution temperature sensors.
Videos HTML
UG-138: Evaluating the ADT7320/ADT7420 Temperature Sensors  (pdf, 927 kB) User Guides PDF
ADT7320/ADT7420: Digital Temperature Sensors FAQ  (pdf, 657 kB) FAQs/RAQs PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADT7420 IBIS Model  (ibs) IBIS Models IBS
ADT7420 - No-OS Driver for Renesas Microcontroller Platforms Device Drivers HTML
ADT7420 - No-OS Driver for Microchip Microcontroller Platforms Device Drivers HTML
ADT7420 Pmod Xilinx FPGA Reference Design FPGA HDL HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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Price, packaging, availability

ADT7420 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADT7420UCPZ-R2 Status: Production 16 ld LFCSP 4x4 16 Mil Reel, 250 - $3.10 Y  Material Info PCN Purchase
ADT7420UCPZ-RL7 Status: Production 16 ld LFCSP 4x4 16 Mil Reel, 1500 - $3.10 Y  Material Info PCN Purchase Sample
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

ADT7420 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-ADT7320FBZ Status: Production Flex Evaluation Board $45.00 Yes -
EVAL-ADT7420FBZ Status: Production Flex Evaluation Board $45.00 Yes -
EVAL-ADT7X20EBZ Status: Production Evaluation Board $59.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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