Datasheet ADT7420 (Analog Devices) - 2

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ADT7420 Data Sheet TABLE OF CONTENTS
Features .. 1 Temperature Value Registers .. 13 Applications ... 1 Status Register ... 14 General Description ... 1 Configuration Register .. 14 Product Highlights ... 1 THIGH Setpoint Registers ... 15 Functional Block Diagram .. 1 TLOW Setpoint Registers .. 15 Revision History ... 2 TCRIT Setpoint Registers .. 15 Specifications ... 3 THYST Setpoint Register ... 16 I2C Timing Specifications .. 5 ID Register... 16 Absolute Maximum Ratings .. 6 Serial Interface .. 17 ESD Caution .. 6 Serial Bus Address .. 17 Pin Configuration and Function Descriptions ... 7 Writing Data ... 18 Typical Performance Characteristics ... 8 Reading Data ... 19 Theory of Operation .. 10 Reset ... 20 Circuit Information .. 10 General Call .. 20 Converter Details.. 10 INT and CT Outputs .. 21 Normal Mode .. 10 Undertemperature and Overtemperature Detection .. 21 One-Shot Mode .. 10 Applications Information .. 23 1 SPS Mode .. 11 Thermal Response Time ... 23 Shutdown ... 11 Supply Decoupling ... 23 Fault Queue ... 11 Powering from a Switching Regulator ... 23 Temperature Data Format ... 12 Temperature Measurement ... 23 Temperature Conversion Formulas ... 12 Quick Guide to Measuring Temperature .. 23 Registers ... 13 Outline Dimensions ... 24 Address Pointer Register ... 13 Ordering Guide .. 24
REVISION HISTORY 9/2017—Rev. 0 to Rev. A 12/2012—Revision 0: Initial Version
Changes to Figure 3 .. 7 Added 0x0C Register Address, 0x0D Register Address, and 0x2E Register Address, Table 6 ... 13 Updated Outline Dimensions ... 24 Changes to Ordering Guide .. 24 Rev. A | Page 2 of 24 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION PRODUCT HIGHLIGHTS FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS I2C TIMING SPECIFICATIONS Timing Diagram ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER DETAILS NORMAL MODE ONE-SHOT MODE CT and INT Operation in One-Shot Mode 1 SPS MODE SHUTDOWN FAULT QUEUE TEMPERATURE DATA FORMAT TEMPERATURE CONVERSION FORMULAS 16-Bit Temperature Data Format 13-Bit Temperature Data Format 10-Bit Temperature Data Format 9-Bit Temperature Data Format REGISTERS ADDRESS POINTER REGISTER TEMPERATURE VALUE REGISTERS STATUS REGISTER CONFIGURATION REGISTER THIGH SETPOINT REGISTERS TLOW SETPOINT REGISTERS TCRIT SETPOINT REGISTERS THYST SETPOINT REGISTER ID REGISTER SERIAL INTERFACE SERIAL BUS ADDRESS WRITING DATA READING DATA RESET GENERAL CALL INT AND CT OUTPUTS UNDERTEMPERATURE AND OVERTEMPERATURE DETECTION Comparator Mode Interrupt Mode APPLICATIONS INFORMATION THERMAL RESPONSE TIME SUPPLY DECOUPLING POWERING FROM A SWITCHING REGULATOR TEMPERATURE MEASUREMENT QUICK GUIDE TO MEASURING TEMPERATURE OUTLINE DIMENSIONS ORDERING GUIDE