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ADT7320 Datasheet(PDF) 1 Page - Analog Devices |
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ADT7320 Datasheet(HTML) 1 Page - Analog Devices |
1 / 24 page ±0.25°C Accurate, 16-Bit Digital SPI Temperature Sensor Preliminary Technical Data ADT7320 Rev. PrA Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2010 Analog Devices, Inc. All rights reserved. FEATURES Temperature accuracy ±0.25°C from −20°C to +105°C 13- or 16-bit user-selectable temperature-to-digital converter Low drift silicon temperature sensor No temperature calibration/correction required by user Power saving 1 sample per second (SPS) mode Fast first conversion on power-up of 6 ms SPI-compatible interface Operating temperature from −40°C to +150°C Operating voltage: 2.7 V to 5.5 V Critical overtemperature indicator Programmable overtemperature/undertemperature interrupt Low power consumption: 700 μW typical at 3.3 V Shutdown mode for lower power: 7 μW typical at 3.3 V 16-lead RoHS-compliant LFCSP package APPLICATIONS RTD and thermistor replacement Medical equipment Cold junction compensation Industrial controls and test Food transportation and storage Environmental monitoring and HVAC GENERAL DESCRIPTION The ADT7320 is a high accuracy digital temperature sensor offering breakthrough performance over a wide industrial range, housed in an LFCSP package. It contains a band gap temperature reference and a 13-bit analog-to-digital converter (ADC) to monitor and digitize the temperature to a 0.0625°C resolution. The ADC resolution, by default, is set to 13 bits (0.0625°C). This can be changed to 16 bits (0.0078°C) by setting Bit 7 in the configuration register (Register Address 0x01). The ADT7320 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 ADT7320 has a shutdown mode that powers down the device and offers a shutdown current of typically 2 μA. 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 default critical temperature limit is 147°C. The INT pin is also an open-drain output that becomes active when the temperature exceeds a programmable limit. The INT and CT pins can operate in either comparator or interrupt mode. FUNCTIONAL BLOCK DIAGRAM INTERNAL REFERENCE 8 7 TEMPERATURE SENSOR THIGH TCRIT TLOW INTERNAL OSCILLATOR FILTER LOGIC Σ-Δ MODULATOR VDD GND 6 5 CT INT 3 4 1 2 ADT7320 CS TEMPERATURE VALUE REGISTER CONFIGURATION AND STATUS REGISTERS TLOW REGISTER TCRIT REGISTER THYST REGISTER THIGH REGISTER SCLK DOUT DIN Figure 1. |
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