Datasheet ADT7316, ADT7317, ADT7318 (Analog Devices) - 2

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ADT7316/ADT7317/ADT7318 TABLE OF CONTENTS
Features .. 1 Output Amplifier.. 21 Applications... 1 Thermal Voltage Output ... 21 Pin Configuration... 1 Functional Description—Measurement.. 23 General Description ... 1 Temperature Sensor ... 23 Revision History ... 2 VDD Monitoring .. 23 Specifications... 3 On-Chip Reference .. 24 Functional Block Diagram .. 8 Round Robin Measurement.. 24 DAC AC Characteristics.. 9 Single-Channel Measurement .. 24 Absolute Maximum Ratings.. 10 Temperature Measurement Method .. 24 ESD Caution.. 10 Temperature Value Format ... 25 Pin Configuration and Function Descriptions... 11 Interrupts... 26 Terminology .. 12 Registers... 27 Typical Performance Characteristics ... 14 Register Descriptions... 28 Theory of Operation .. 19 Serial Interface .. 36 Power-Up Calibration.. 19 Serial Interface Selection ... 36 Conversion Speed... 19 I2C Serial Interface ... 36 Functional Description—Voltage Output ... 20 SPI Serial Interface ... 37 Digital-to-Analog Converters... 20 Layout Considerations... 41 Digital-to-Analog Section ... 20 Outline Dimensions ... 42 Resistor String ... 20 Ordering Guide .. 42 DAC External Reference Inputs ... 20
REVISION HISTORY 6/04—Rev. 0 to Rev. A 1/07—Rev. A to Rev. B
Updated Format.. Universal Updated Format..Universal Internal VREF Value Change... Universal Changes to Table 3.. 10 Change to Equation in Thermal Voltage Output Section..21 Changes to Internal T Changes to Outline Dimensions ...40 HIGH Limit Register (Read/Write) [Address 0x25] Section .. 33
8/03—Revision 0: Initial Version
Changes to Internal TLOW Limit Register (Read/Write) [Address 0x26] Section .. 33 Changes to External THIGH Limit Register (Read/Write) [Address 0x27] Section .. 33 External TLOW Limit Register (Read/Write) [Address 0x28] Section.. 37 Changes to SPI Interface Section.. 38 Updated Outline Dimensions ... 42 Changes to Ordering Guide .. 42 Rev. B | Page 2 of 44 Document Outline FEATURES APPLICATIONS PIN CONFIGURATION GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS FUNCTIONAL BLOCK DIAGRAM DAC AC CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION POWER-UP CALIBRATION CONVERSION SPEED FUNCTIONAL DESCRIPTION—VOLTAGE OUTPUT DIGITAL-TO-ANALOG CONVERTERS DIGITAL-TO-ANALOG SECTION RESISTOR STRING DAC EXTERNAL REFERENCE INPUTS OUTPUT AMPLIFIER THERMAL VOLTAGE OUTPUT Negative Temperatures Positive Temperatures FUNCTIONAL DESCRIPTION—MEASUREMENT TEMPERATURE SENSOR VDD MONITORING ON-CHIP REFERENCE ROUND ROBIN MEASUREMENT SINGLE-CHANNEL MEASUREMENT TEMPERATURE MEASUREMENT METHOD Internal Temperature Measurement External Temperature Measurement TEMPERATURE VALUE FORMAT Temperature Conversion Formula INTERRUPTS REGISTERS REGISTER DESCRIPTIONS SERIAL INTERFACE SERIAL INTERFACE SELECTION I2C SERIAL INTERFACE Writing to the ADT7316/ADT7317/ADT7318 Writing to the Address Pointer Register for a Subsequent Read Writing Data to a Register Reading Data from the ADT7316/ADT7317/ADT7318 SPI SERIAL INTERFACE Write Operation Read Operation SMBUS/SPI INT/ SMBUS Alert Response LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE