Datasheet LTM4680 (Analog Devices) - 112

LTM4680
PMBus COMMAND DETAILS MFR_PADS
This command provides the user a means of directly reading the digital status of the I/O pins of the device. The bit assignments of this command are as follows:
BIT ASSIGNED DIGITAL PIN
15 VDD33 OV Fault 14 VDD33 UV Fault 13 Reserved 12 Reserved 11 ADC Values Invalid, Occurs During Start-Up. May Occur Briefly on Current Measurement Channels During Normal Operation 10 SYNC clocked by external device (when LTM4680 configured to drive SYNC pin) 9 Channel 1 Power Good 8 Channel 0 Power Good 7 LTM4680 Driving RUN1 Low 6 LTM4680 Driving RUN0 Low 5 RUN1 Pin State 4 RUN0 Pin State 3 LTM4680 Driving FAULT1 Low 2 LTM4680 Driving FAULT0 Low 1 FAULT1 Pin State 0 FAULT0 Pin State A 1 indicates the condition is true. This read-only command has two data bytes.
MFR_COMMON
The MFR_COMMON command contains bits that are common to all ADI digital power and telemetry products.
BIT MEANING
7 Module Not Driving ALERT Low 6 LTM4680 Not Busy 5 Calculations Not Pending 4 LTM4680 Outputs Not in Transition 3 NVM Initialized 2 Reserved 1 SHARE_CLK Timeout 0 WP Pin Status This read-only command has one data byte. Rev. A 112 For more information www.analog.com Document Outline Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Functional Diagram Test Circuits Operation Power Module Introduction Power Module Overview, Major Features EEPROM with ECC Power-Up and Initialization Soft-Start Time-Based Sequencing Voltage-Based Sequencing Shutdown Light-Load Current Operation Switching Frequency and Phase PWM Loop Compensation Output Voltage Sensing INTVCC/EXTVCC Power Output Current Sensing and Sub Milliohm DCR Current Sensing Input Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Table 1. VOUTn_CFG Pin Strapping Look-Up Table for the LTM4680’s Output Voltage, Coarse Setting (Not Applicable if MFR_CONFIG_ALL[6] = 1b) Table 2. VTRIMn_CFG Pin Strapping Look-Up Table for the LTM4680’s Output Voltage, Fine Adjustment Setting (Not Applicable if MFR_CONFIG_ALL[6] = 1b) Table 3. FSWPH_CFG Pin Strapping Look-Up Table to Set the LTM4680’s Switching Frequency and Channel Phase-Interleaving Angle (Not Applicable if MFR_CONFIG_ALL[6] = 1b) Table 4. ASEL Pin Strapping Look-Up Table to Set the LTM4680’s Slave Address (Applicable Regardless of MFR_CONFIG_ALL[6] Setting) Table 5. LTM4680 MFR_ADDRESS Command Examples Expressed in 7- and 8-Bit Addressing Fault Detection and Handling Status Registers and ALERT Masking Figure 5. LTM4680 Status Register Summary Mapping Faults to FAULT Pins Power Good Pins CRC Protection Serial Interface Communication Protection Device Addressing Responses to VOUT and IIN/IOUT Faults Output Overvoltage Fault Response Output Undervoltage Response Peak Output Overcurrent Fault Response Responses to Timing Faults Responses to VIN OV Faults Responses to OT/UT Faults Internal Overtemperature Fault Response External Overtemperature and Undertemperature Fault Response Responses to Input Overcurrent and Output Undercurrent Faults Responses to External Faults Fault Logging Bus Timeout Protection Similarity Between PMBus, SMBus and I2C 2-Wire Interface PMBus Serial Digital Interface Table 6. Abbreviations of Supported Data Formats Figure 6. PMBus Timing Diagram Figures 7 to 24 PMBus Protocols PMBus Command Summary PMBus Commands Table 7. PMBus Commands Summary (Note: The Data Format Abbreviations Are Detailed in Table 8) Table 8. Data Format Abbreviations Applications Information VIN to VOUT Step-Down Ratios Input Capacitors Output Capacitors Light Load Current Operation Switching Frequency and Phase Output Current Limit Programming Minimum On-Time Considerations Variable Delay Time, Soft-Start and Output Voltage Ramping Digital Servo Mode Soft Off (Sequenced Off) Undervoltage Lockout Fault Detection and Handling Open-Drain Pins Phase-Locked Loop and Frequency Synchronization Input Current Sense Amplifier Programmable Loop Compensation Checking Transient Response PolyPhase Configuration Connecting The USB to I2C/SMBus/PMBus Controller to the LTM4680 In System LTpowerPlay: An Interactive GUI for Digital Power PMBus Communication and Command Processing Thermal Considerations and Output Current Derating Tables 10 thru 11: Output Current Derating Table 12. Channel Output Voltage vs Capacitor Selection, All Ceramic Configuration, 15A to 30A Load Step with 15A/µs Slew Rate Table 13. Channel Output Voltage vs Capacitor Selection, Bulk and Ceramic Cap Configuration, 15A to 30A Load Step with 15A/µs Slew Rate Table 14. Dual Phase Single Output Voltage vs Capacitor Selection, Bulk and Ceramic Cap Configuration, 30A to 60A Load Step with 30A/µs Slew Rate Derating Curves EMI Performance Safety Considerations Layout Checklist/Example Typical Applications PMBus Command Details Addressing and Write Protect General Configuration Commands On/Off/Margin PWM Configuration Voltage Input Voltage and Limits Output Voltage and Limits Output Current and Limits Input Current and Limits Temperature Power Stage DCR Temperature Calibration Timing Timing—On Sequence/Ramp Timing—Off Sequence/Ramp Precondition for Restart Fault Response Fault Responses All Faults Fault Responses Input Voltage Fault Responses Output Voltage Fault Responses Output Current Fault Responses IC Temperature Fault Responses External Temperature Fault Sharing Fault Sharing Propagation Fault Sharing Response Scratchpad Identification Fault Warning and Status Telemetry NVM Memory Commands Store/Restore Fault Logging Block Memory Write/Read Package Description Table 23. LTM4680 BGA Pinout Package Photograph Design Resources Related Parts