Datasheet LTC3887, LTC3887-1, LTC3887-2 (Analog Devices) - 90

LTC3887/LTC3887-1/ LTC3887-2
PMBus COMMAND DETAILS SCRATCHPAD DATA DEFAULT COMMAND NAME CMD CODE DESCRIPTION TYPE PAGED FORMAT UNITS NVM VALUE
USER_DATA_00 0xB0 OEM reserved. Typically used for part serialization. R/W Word N Reg Y NA USER_DATA_01 0xB1 Manufacturer reserved for LTpowerPlay. R/W Word Y Reg Y NA USER_DATA_02 0xB2 OEM reserved. Typically used for part serialization. R/W Word N Reg Y NA USER_DATA_03 0xB3 A NVM word available for the user. R/W Word Y Reg Y 0x0000 USER_DATA_04 0xB4 A NVM word available for the user. R/W Word N Reg Y 0x0000
USER_DATA_00 through USER_DATA_04
These commands are non-volatile memory locations for customer storage. The customer has the option to write any value to the USER_DATA_nn at any time. However, the LTpowerPlay software and contract manufacturers use some of these commands for inventory control. Modifying the reserved USER_DATA_nn commands may lead to undesirable inventory control and incompatibility with these products. These commands have 2 data bytes and are in register format.
IDENTIFICATION DATA DEFAULT COMMAND NAME CMD CODE DESCRIPTION TYPE PAGED FORMAT UNITS NVM VALUE
PMBUS_REVISION 0x98 PMBus revision supported by this device. Current revision R Byte N Reg 0x22 is 1.2. CAPABILITY 0x19 Summary of PMBus optional communication protocols R Byte N Reg 0xB0 supported by this device. MFR_ID 0x99 The manufacturer ID of the LTC3887 in ASCII. R String N ASC LTC MFR_MODEL 0x9A Manufacturer part number in ASCII. R String N ASC LTC3887 MFR_SERIAL 0x9E Serial number of this specific unit in ASCII. R Block N CF NA MFR_SPECIAL_ID 0xE7 Manufacturer code representing the LTC3887. R Word N Reg 0x470X
PMBus_REVISION
The PMBUS_REVISION command indicates the revision of the PMBus to which the device is compliant. The LTC3887 is PMBus Version 1.2 compliant in both Part I and Part II. This read-only command has one data byte.
CAPABILITY
This command provides a way for a host system to determine some key capabilities of a PMBus device. The LTC3887 supports packet error checking, 400kHz bus speeds, and ALERT pin. This read-only command has one data byte.
MFR_ID
The MFR_ID command indicates the manufacturer ID of the LTC3887 using ASCII characters. This read-only command is in block format. Rev.F 90 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 (NVM) Power Up and Initialization Soft-Start Sequencing EVENT-Based Sequencing Shutdown Light Load Current Operation Switching Frequency and Phase Output Voltage Sensing Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Fault Detection and Handling Internal EEPROM with CRC Protection and ECC Serial Interface Communication Protection 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 Internal Overtemperature Fault/Warn Response External Overtemperature and Undertemperature Fault Response 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 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) (LTC3887, LTC3887-2) Undervoltage Lockout CIN and COUT Selection Fault Conditions Open-Drain Pins Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations RCONFIG (External Resistor Configuration Pins) Voltage Selection Frequency and Phase Selection Using RCONFIG Address Selection Using RCONFIG Efficiency Considerations Checking Transient Response PC Board Layout Checklist PC Board Layout Debugging Design Example Additional Design Checks Connecting the USB to the I2C/SMBus/PMBus Controller to the LTC3887 In System LTpowerPlay: An Interactive GUI for Digital Power PMBus Communication and Command Processing PMBus Command Details Addressing and Write Protect General Configuration Registers On/Off/Margin PWM Config Voltage Input Voltage and Limits Output Voltage and Limits Current Input Current Calibration Output Current Calibration Input Current Output 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 Fault Warning and Status Telemetry NVM (EEPROM) Memory Commands Store/Restore Fault Logging Block Memory Write/Read Typical Applications Package Description Revision History Typical Application Related Parts