Datasheet LTC3884, LTC3884-1 (Analog Devices) - 87

LTC3884/LTC3884-1
PMBus COMMAND DETAILS IOUT_OC_WARN_LIMIT
This command sets the value of the output current measured by the ADC that causes an output overcurrent warning in Amperes. The READ_IOUT value will be used to determine if this limit has been exceeded. In response to the IOUT_OC_WARN_LIMIT being exceeded, the device: • Sets the NONE_OF_THE_ABOVE bit in the STATUS_BYTE • Sets the IOUT bit in the STATUS_WORD • Sets the IOUT Overcurrent Warning bit in the STATUS_IOUT command, and • Notifies the host by asserting ALERT pin, unless masked The IOUT_OC_FAULT_LIMIT is ignored during TON_RISE and TOFF_FALL. This command has two data bytes and is formatted in Linear_5s_11s format
Input Current and Limits CMD DATA DEFAULT COMMAND NAME CODE DESCRIPTION TYPE FORMAT UNITS NVM VALUE
MFR_IIN_CAL_GAIN 0xE8 The resistance value of the input current sense R/W Word L11 mΩ Y 5.000 element in mΩ. 0xCA80
MFR_IIN_CAL_GAIN
The MFR_IIN_CAL_GAIN command is used to set the resistance value of the input current sense resistor in milliohms. (see also READ_IIN). This command has two data bytes and is formatted in Linear_5s_11s format.
DATA DEFAULT COMMAND NAME CMD CODE DESCRIPTION TYPE PAGED FORMAT UNITS NVM VALUE
IIN_OC_WARN_LIMIT 0x5D Input overcurrent warning R/W Word N L11 A Y 10.0 limit. 0xD280
IIN_OC_WARN_LIMIT
The IIN_OC_WARN_LIMIT command sets the value of the input current measured by the ADC, in amperes, that causes a warning indicating the input current is high. The READ_IIN value will be used to determine if this limit has been exceeded. In response to the IIN_OC_WARN_LIMIT being exceeded, the device: • Sets the OTHER bit in the STATUS_BYTE • Sets the INPUT bit in the upper byte of the STATUS_WORD • Sets the IIN Overcurrent Warning bit[1] in the STATUS_INPUT command, and • Notifies the host by asserting ALERT pin This command has two data bytes and is formatted in Linear_5s_11s format. Rev. F For more information www.analog.com 87 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