Datasheet AD74412R (Analog Devices) - 2
| 制造商 | Analog Devices |
| 描述 | Quad-Channel, Software Configurable Input/Output |
| 页数 / 页 | 66 / 2 — AD74412R. Data Sheet. TABLE OF CONTENTS |
| 修订版 | A |
| 文件格式/大小 | PDF / 1.2 Mb |
| 文件语言 | 英语 |
AD74412R. Data Sheet. TABLE OF CONTENTS
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AD74412R Data Sheet TABLE OF CONTENTS
Features .. 1 ADC Functionality ... 40 Applications ... 1 Diagnostics .. 44 General Description ... 1 DACs .. 45 Companion Products ... 1 Driving Inductive Loads .. 46 Product Highlights ... 1 Reset Function .. 46 Revision History ... 3 Thermal Alert and Thermal Reset ... 46 Functional Block Diagram .. 4 Faults and Alerts ... 46 Specifications ... 5 Power Supply Monitors ... 46 Voltage Output .. 5 GPO_x Pins ... 47 Current Output ... 6 SPI Interface and Diagnostics ... 47 Voltage Input ... 7 Board Design and Layout Considerations .. 50 Current Input External y Powered ... 8 Applications Information .. 51 Current Input Loop Powered .. 9 Register Map ... 52 RTD Measurement ... 9 NOP Register .. 53 Digital Input Logic ... 10 Function Setup Register per Channel .. 53 Digital Input Loop Powered .. 10 ADC Configuration Register per Channel ... 53 ADC Specifications .. 11 Digital Input Configuration Register per Channel .. 54 General Specifications ... 12 GPO Parallel Data Register ... 55 Timing Characteristics .. 14 GPO Configuration Register per Channel ... 55 Absolute Maximum Ratings .. 16 Output Configuration Register per Channel .. 56 Thermal Resistance .. 16 DAC Code Register per Channel ... 56 ESD Caution .. 16 DAC Clear Code Register per Channel ... 56 Pin Configuration and Function Descriptions ... 17 DAC Active Code Register per Channel ... 57 Typical Performance Characteristics ... 20 Digital Input Threshold Register.. 57 Voltage Output .. 20 ADC Conversion Control Register .. 57 Current Output ... 22 Diagnostics Select Register ... 58 Reference ... 24 Digital Output Level Register ... 59 ADC ... 25 ADC Conversion Results Register per Channel .. 60 Supplies .. 26 Diagnostic Results Registers per Diagnostic Channel .. 60 Theory of Operation .. 27 Alert Status Register ... 60 Robust Architecture ... 27 Live Status Register .. 62 Serial Interface .. 27 Alert Mask Register .. 63 DAC Architecture ... 27 Readback Select Register ... 63 ADC Overview ... 28 80 SPS ADC Conversion Control Register ... 64 Reference ... 28 Thermal Reset Enable Register ... 64 Power-On State of the AD74412R.. 28 Command Register .. 65 Device Functions .. 28 Scratch or Spare Register ... 65 Digital Input, Loop Powered Mode ... 38 Silicon Revision Register ... 65 Getting Started .. 39 Outline Dimensions ... 66 Using Channel Functions .. 39 Ordering Guide .. 66 Rev. A | Page 2 of 66 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION COMPANION PRODUCTS PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS VOLTAGE OUTPUT CURRENT OUTPUT VOLTAGE INPUT CURRENT INPUT EXTERNALLY POWERED CURRENT INPUT LOOP POWERED RTD MEASUREMENT DIGITAL INPUT LOGIC DIGITAL INPUT LOOP POWERED ADC SPECIFICATIONS GENERAL SPECIFICATIONS TIMING CHARACTERISTICS SPI Timing Specifications Timing Diagrams ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS VOLTAGE OUTPUT CURRENT OUTPUT REFERENCE ADC SUPPLIES THEORY OF OPERATION ROBUST ARCHITECTURE SERIAL INTERFACE DAC ARCHITECTURE ADC OVERVIEW REFERENCE Reference Noise Charge Pump POWER-ON STATE OF THE AD74412R DEVICE FUNCTIONS High Impedance Interpreting ADC Data Voltage Output Mode Voltage Output Short-Circuit Protection Interpretin ADC Data Current Output Mode Current Output Open Circuit Detection Interpreting ADC Data Voltage Input Mode Selectable 200 kΩ to GND Interpreting ADC Data Current Input, Externally Powered Mode Short-Circuit Protection Interpreting ADC Data Current Input, Loop Powered Mode Short-Circuit Protection Interpreting ADC Data Resistance Measurement (External 2-Wire RTD) Interpreting ADC Data Digital Input Logic Interpreting ADC Data Digital Input Current Sink Digital Input Threshold Setting Debounce Function Debounce Mode 0 (Default) Debounce Mode 1 Digital Input Inverter DIGITAL INPUT, LOOP POWERED MODE Interpreting ADC Data GETTING STARTED USING CHANNEL FUNCTIONS Switching Channel Functions ADC FUNCTIONALITY ADC Conversion Rates ADC_RDYB Functionality ADC Output Data Format ADC Noise DIAGNOSTICS DACs LDAC Function Clear Code Function Digital Linear Slew Rate Control DRIVING INDUCTIVE LOADS RESET FUNCTION THERMAL ALERT AND THERMAL RESET FAULTS AND ALERTS Channel Faults POWER SUPPLY MONITORS GPO_x PINS SPI INTERFACE AND DIAGNOSTICS SPI CRC SPI Interface SCLK Count Feature Readback Mode Streaming Mode Auto Readback BOARD DESIGN AND LAYOUT CONSIDERATIONS APPLICATIONS INFORMATION REGISTER MAP NOP REGISTER FUNCTION SETUP REGISTER PER CHANNEL ADC CONFIGURATION REGISTER PER CHANNEL DIGITAL INPUT CONFIGURATION REGISTER PER CHANNEL GPO PARALLEL DATA REGISTER GPO CONFIGURATION REGISTER PER CHANNEL OUTPUT CONFIGURATION REGISTER PER CHANNEL DAC CODE REGISTER PER CHANNEL DAC CLEAR CODE REGISTER PER CHANNEL DAC ACTIVE CODE REGISTER PER CHANNEL DIGITAL INPUT THRESHOLD REGISTER ADC CONVERSION CONTROL REGISTER DIAGNOSTICS SELECT REGISTER DIGITAL OUTPUT LEVEL REGISTER ADC CONVERSION RESULTS REGISTER PER CHANNEL DIAGNOSTIC RESULTS REGISTERS PER DIAGNOSTIC CHANNEL ALERT STATUS REGISTER LIVE STATUS REGISTER ALERT MASK REGISTER READBACK SELECT REGISTER 80 SPS ADC CONVERSION CONTROL REGISTER THERMAL RESET ENABLE REGISTER COMMAND REGISTER SCRATCH OR SPARE REGISTER SILICON REVISION REGISTER OUTLINE DIMENSIONS ORDERING GUIDE
AD74412R Data Sheet TABLE OF CONTENTS
Features .. 1 ADC Functionality ... 40 Applications ... 1 Diagnostics .. 44 General Description ... 1 DACs .. 45 Companion Products ... 1 Driving Inductive Loads .. 46 Product Highlights ... 1 Reset Function .. 46 Revision History ... 3 Thermal Alert and Thermal Reset ... 46 Functional Block Diagram .. 4 Faults and Alerts ... 46 Specifications ... 5 Power Supply Monitors ... 46 Voltage Output .. 5 GPO_x Pins ... 47 Current Output ... 6 SPI Interface and Diagnostics ... 47 Voltage Input ... 7 Board Design and Layout Considerations .. 50 Current Input External y Powered ... 8 Applications Information .. 51 Current Input Loop Powered .. 9 Register Map ... 52 RTD Measurement ... 9 NOP Register .. 53 Digital Input Logic ... 10 Function Setup Register per Channel .. 53 Digital Input Loop Powered .. 10 ADC Configuration Register per Channel ... 53 ADC Specifications .. 11 Digital Input Configuration Register per Channel .. 54 General Specifications ... 12 GPO Parallel Data Register ... 55 Timing Characteristics .. 14 GPO Configuration Register per Channel ... 55 Absolute Maximum Ratings .. 16 Output Configuration Register per Channel .. 56 Thermal Resistance .. 16 DAC Code Register per Channel ... 56 ESD Caution .. 16 DAC Clear Code Register per Channel ... 56 Pin Configuration and Function Descriptions ... 17 DAC Active Code Register per Channel ... 57 Typical Performance Characteristics ... 20 Digital Input Threshold Register.. 57 Voltage Output .. 20 ADC Conversion Control Register .. 57 Current Output ... 22 Diagnostics Select Register ... 58 Reference ... 24 Digital Output Level Register ... 59 ADC ... 25 ADC Conversion Results Register per Channel .. 60 Supplies .. 26 Diagnostic Results Registers per Diagnostic Channel .. 60 Theory of Operation .. 27 Alert Status Register ... 60 Robust Architecture ... 27 Live Status Register .. 62 Serial Interface .. 27 Alert Mask Register .. 63 DAC Architecture ... 27 Readback Select Register ... 63 ADC Overview ... 28 80 SPS ADC Conversion Control Register ... 64 Reference ... 28 Thermal Reset Enable Register ... 64 Power-On State of the AD74412R.. 28 Command Register .. 65 Device Functions .. 28 Scratch or Spare Register ... 65 Digital Input, Loop Powered Mode ... 38 Silicon Revision Register ... 65 Getting Started .. 39 Outline Dimensions ... 66 Using Channel Functions .. 39 Ordering Guide .. 66 Rev. A | Page 2 of 66 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION COMPANION PRODUCTS PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS VOLTAGE OUTPUT CURRENT OUTPUT VOLTAGE INPUT CURRENT INPUT EXTERNALLY POWERED CURRENT INPUT LOOP POWERED RTD MEASUREMENT DIGITAL INPUT LOGIC DIGITAL INPUT LOOP POWERED ADC SPECIFICATIONS GENERAL SPECIFICATIONS TIMING CHARACTERISTICS SPI Timing Specifications Timing Diagrams ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS VOLTAGE OUTPUT CURRENT OUTPUT REFERENCE ADC SUPPLIES THEORY OF OPERATION ROBUST ARCHITECTURE SERIAL INTERFACE DAC ARCHITECTURE ADC OVERVIEW REFERENCE Reference Noise Charge Pump POWER-ON STATE OF THE AD74412R DEVICE FUNCTIONS High Impedance Interpreting ADC Data Voltage Output Mode Voltage Output Short-Circuit Protection Interpretin ADC Data Current Output Mode Current Output Open Circuit Detection Interpreting ADC Data Voltage Input Mode Selectable 200 kΩ to GND Interpreting ADC Data Current Input, Externally Powered Mode Short-Circuit Protection Interpreting ADC Data Current Input, Loop Powered Mode Short-Circuit Protection Interpreting ADC Data Resistance Measurement (External 2-Wire RTD) Interpreting ADC Data Digital Input Logic Interpreting ADC Data Digital Input Current Sink Digital Input Threshold Setting Debounce Function Debounce Mode 0 (Default) Debounce Mode 1 Digital Input Inverter DIGITAL INPUT, LOOP POWERED MODE Interpreting ADC Data GETTING STARTED USING CHANNEL FUNCTIONS Switching Channel Functions ADC FUNCTIONALITY ADC Conversion Rates ADC_RDYB Functionality ADC Output Data Format ADC Noise DIAGNOSTICS DACs LDAC Function Clear Code Function Digital Linear Slew Rate Control DRIVING INDUCTIVE LOADS RESET FUNCTION THERMAL ALERT AND THERMAL RESET FAULTS AND ALERTS Channel Faults POWER SUPPLY MONITORS GPO_x PINS SPI INTERFACE AND DIAGNOSTICS SPI CRC SPI Interface SCLK Count Feature Readback Mode Streaming Mode Auto Readback BOARD DESIGN AND LAYOUT CONSIDERATIONS APPLICATIONS INFORMATION REGISTER MAP NOP REGISTER FUNCTION SETUP REGISTER PER CHANNEL ADC CONFIGURATION REGISTER PER CHANNEL DIGITAL INPUT CONFIGURATION REGISTER PER CHANNEL GPO PARALLEL DATA REGISTER GPO CONFIGURATION REGISTER PER CHANNEL OUTPUT CONFIGURATION REGISTER PER CHANNEL DAC CODE REGISTER PER CHANNEL DAC CLEAR CODE REGISTER PER CHANNEL DAC ACTIVE CODE REGISTER PER CHANNEL DIGITAL INPUT THRESHOLD REGISTER ADC CONVERSION CONTROL REGISTER DIAGNOSTICS SELECT REGISTER DIGITAL OUTPUT LEVEL REGISTER ADC CONVERSION RESULTS REGISTER PER CHANNEL DIAGNOSTIC RESULTS REGISTERS PER DIAGNOSTIC CHANNEL ALERT STATUS REGISTER LIVE STATUS REGISTER ALERT MASK REGISTER READBACK SELECT REGISTER 80 SPS ADC CONVERSION CONTROL REGISTER THERMAL RESET ENABLE REGISTER COMMAND REGISTER SCRATCH OR SPARE REGISTER SILICON REVISION REGISTER OUTLINE DIMENSIONS ORDERING GUIDE