Datasheet LTC3883, LTC3883-1 (Analog Devices) - 107

LTC3883/LTC3883-1
PMBus COMMAND DETAILS
STATUS_WORD [15:8] WORD 141 [7:0] 142 Reserved BYTE 143 Always returns 0x00. Reserved BYTE 144 Always returns 0x00. STATUS_MFR_SPECIFIC BYTE 145 Reserved BYTE 146 Always returns 0x00.
Table 11a: Explanation of Position_Fault Values
POSITION_FAULT VALUE SOURCE OF FAULT LOG 0xFF MFR_FAULT_LOG_STORE 0x00 TON_MAX_FAULT 0x01 VOUT_OV_FAULT 0x02 VOUT_UV_FAULT 0x03 IOUT_OC_FAULT 0x05 TEMP_OT_FAULT 0x06 TEMP_UT_FAULT 0x07 VIN_OV_FAULT 0x0A MFR_TEMP_2_OT_FAULT
MFR_FAULT_LOG_CLEAR
The MFR_FAULT_LOG_CLEAR command will erase the fault log file stored values. It will also clear bit 3 in the STATUS_MFR_SPECIFIC command. After a clear is issued, the status can take up to 8ms to clear. This write-only command is send bytes.
Block Memory Write/Read DATA DEFAULT COMMAND NAME CMD CODE DESCRIPTION TYPE FORMAT UNITS NVM VALUE
MFR_EE_UNLOCK 0xBD Unlock user EEPROM for access by MFR_EE_ERASE and R/W Byte Reg NA MFR_EE_DATA commands. MFR_EE_ERASE 0xBE Initialize user EEPROM for bulk programming by MFR_EE_ R/W Byte Reg NA DATA. MFR_EE_DATA 0xBF Data transferred to and from EEPROM using sequential R/W Reg NA PMBus word reads or writes. Supports bulk programming. Word All the NVM commands are disabled if the die temperature exceeds 130°C. NVM commands are re-enabled when the die temperature drops below 125°C.
MFR_EE_UNLOCK
Multiple writes to MFR_EE_UNLOCK with the appropriate unlock keys are used to enable MFR_EE_ERASE and MFR_ EE_DATA access and configure PEC. Communication with the LTC3883 and programming of the NVM can be initiated when VDD33 is applied and VIN is not. To enable the part in this state, use global address 0x5B command MFR_EE_UNLOCK data 0x2B followed by ad- dress 0x5B command MFR_EE_UNLOCK data 0xC4. When VIN is applied, a MFR_RESET must be issued to allow the PWM to be enabled and valid ADCs to be read. Rev. F For more information www.analog.com 107 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 Sequencing Voltage-Based Sequencing Shutdown Light Load Current Operation Switching Frequency and Phase Output Voltage Sensing Output Current Sensing Auto Calibration Accurate DCR Temperature Compensation Input Current Sensing Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Fault Detection and Handling Internal Memory with CRC and ECC Serial Interface Communication Failure Device Addressing Responses to VOUT 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 Overtemperature Fault Response—Internal Overtemperature and Undertemperature Fault Response—Externals Responses To Input Overcurrent And Output Undercurrent Faults Responses to External Faults Fault Logging Bus Timeout Failure 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 ISENSE+ and ISENSE– Pins Low Value Resistor Current Sensing Inductor DCR Current Sensing Slope Compensation and Inductor Peak Current Inductor Value Calculation Inductor Core Selection Power MOSFET and Schottky Diode (Optional) Selection Variable Delay Time, Soft-Start and Output Voltage Ramping Digital Servo Mode Soft Off (Sequenced Off) INTVCC Regulator Topside MOSFET Driver Supply (CB, DB) Undervoltage Lockout CIN and COUT Selection Fault Conditions Open-Drain Pins Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations Input Current Sense Amplifier RCONFIG (External Resistor Configuration Pins) Voltage Selection Frequency and Phase Selection Using RCONFIG Address Selection Using RCONFIG Efficiency Considerations Checking Transient Response PolyPhase Configuration PC Board Layout Checklist PC Board Layout Debugging Design Example Connecting the USB to I2C/SMBus/PMBus Controller to the LTC3883 In System Inductor DCR Auto Calibration Accurate DCR Temperature Compensation 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 Current Output Current Calibration Output Current Input Current Calibration Input Current Temperature External Temperature Calibration External Temperature Limits 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 Telemetry NVM Memory Commands Store/Restore Fault Logging Block Memory Write/Read Typical Applications Package Description Revision History Typical Application Related Parts