Datasheet LTC3884, LTC3884-1 (Analog Devices) - 92

LTC3884/LTC3884-1
PMBus COMMAND DETAILS Fault Responses Input Voltage DATA DEFAULT COMMAND NAME CMD CODE DESCRIPTION TYPE PAGED FORMAT UNITS NVM VALUE
VIN_OV_FAULT_RESPONSE 0x56 Action to be taken by the device when an R/W Byte Y Reg Y 0x80 input supply overvoltage fault is detected.
VIN_OV_FAULT_RESPONSE
The VIN_OV_FAULT_RESPONSE command instructs the device on what action to take in response to an input over- voltage fault. The data byte is in the format given in Table 11. The device also: • Sets the NONE_OF_THE_ABOVE bit in the STATUS_BYTE • Set the INPUT bit in the upper byte of the STATUS_WORD • Sets the VIN Overvoltage Fault bit in the STATUS_INPUT command, and • Notifies the host by asserting ALERT pin, unless masked This command has one data byte.
Fault Responses Output Voltage DATA DEFAULT COMMAND NAME CMD CODE DESCRIPTION TYPE PAGED FORMAT UNITS NVM VALUE
VOUT_OV_FAULT_RESPONSE 0x41 Action to be taken by the device when an R/W Byte Y Reg Y 0xB8 output overvoltage fault is detected. VOUT_UV_FAULT_RESPONSE 0x45 Action to be taken by the device when an R/W Byte Y Reg Y 0xB8 output undervoltage fault is detected. TON_MAX_FAULT_ 0x63 Action to be taken by the device when a R/W Byte Y Reg Y 0xB8 RESPONSE TON_MAX_FAULT event is detected.
VOUT_OV_FAULT_RESPONSE
The VOUT_OV_FAULT_RESPONSE command instructs the device on what action to take in response to an output overvoltage fault. The data byte is in the format given in Table 7. The device also: • Sets the VOUT_OV bit in the STATUS_BYTE • Sets the VOUT bit in the STATUS_WORD • Sets the VOUT Overvoltage Fault bit in the STATUS_VOUT command • Notifies the host by asserting ALERT pin, unless masked The only values recognized for this command are: 0x00–Part performs OV pull down only, or OV_PULLDOWN. 0x80–The device shuts down (disables the output) and the unit does not attempt to retry. (PMBus, Part II, Section 10.7). Rev. F 92 For more information www.analog.com Document Outline Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Overview Main Control Loop EEPROM 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 Fault Detection and Handling Status Registers and ALERT Masking Mapping Faults to FAULT Pins Power Good Pins CRC Protection and ECC Serial Interface Communication Protection Device Addressing Responses to VOUT, IIN and 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 PMBus Command Summary PMBus Commands *Data Format Applications Information Current Limit Programming ISENSE0± and ISENSE1± Pins Inductor DCR Sensing Inductor Value Calculation Inductor Core Selection Low Value Resistor Current Sensing Slope Compensation and Inductor Peak Current Power MOSFET and Optional Schottky Diode Selection Variable Delay Time, Soft-Start and Output Voltage Ramping Digital Servo Mode Soft Off (Sequenced Off) INTVCC/EXTVCC Power Topside MOSFET Driver Supply (CB, DB) Undervoltage Lockout CIN and COUT Selection Fault Indication Open-Drain Pins Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations External Temperature Sense Input Current Sense Amplifier External Resistor Configuration Pins (RCONFIG) Voltage Selection Frequency Selection Phase Selection Address Selection Using RCONFIG Efficiency Considerations Programmable Loop Compensation Checking Transient Response PolyPhase Configuration Master Slave Operation PC Board Layout Checklist PC Board Layout Debugging Design Example Additional Design Checks Connecting the USB to I2C/SMBus/PMBus Controller to the LTC3884 in System LTpowerPlay: An Interactive GUI for Digital Power PMBus Communication and Command Processing 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 External 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 Log Operation Fault Logging Block Memory Write/Read Typical Applications Package Description Revision History Typical Application Related Parts