LTC3815_15 Datasheet, PDF (13/42 Pages) Linear Technology – 6A Monolithic Synchronous DC/DC Step-Down Converter with Digital Power System Management

LTC3815
Operation
Table 1. LTC3815 Supported PMBus Commands
PMBUS
COMMAND
CODE
COMMAND NAME
PMBUS-DEFINED SMBUS
DATA
TRANSACTION TYPE SCALING BYTES DESCRIPTION
0x01
OPERATION
R/W Byte
1 On/Off Command and Set Output to MFR_VOUT_
MARGIN_HIGH or MFR_VOUT_MARGIN_LOW value
0x20
VOUT_MODE
Read Byte
1 or 2 Read Data Format for MFR_VOUT_COMMAND
Hard-wired to VID format (0x3E), not writable
0x79
STATUS_WORD
R/W Word
2 Read Fault Status: Communication fault, PGOOD, V_IN
UV, V_OUT OV, overtemperature, V_IN fault, V_OUT fault
Individual faults are reset by writing a '1' to the bit
position of the fault to be reset
0x88
READ_VIN
0x89
READ_IIN
0x8B
READ_VOUT
0x8C
READ_IOUT
0x8D
READ_TEMPERATURE_1
R Word
R Word
R Word
R Word
R Word
4mV/Bit
2 Read V_IN
10mA/Bit
2 Read I_IN
0.5mV/Bit 2 Read V_OUT
10mA/Bit
2 Read I_OUT
1°C/Bit
2 Read Die Temperature (°C)
0X98
PMBUS_REVISION
Read Byte
1 or 2 Read PMBus Revision = 0x22 for Rev 1.2
0xD7
MFR_IOUT_PEAK
R/W Word
10mA/Bit
2 Read highest output current observed since last restart
Write will restart peak monitor routine
0xDD
MFR_VOUT_PEAK
R/W Word
0.5mV/Bit 2 Read highest output voltage observed since last restart
Write will restart peak monitor routine
0xDE
MFR_VIN_PEAK
R/W Word
4mV/Bit
2 Read highest input voltage observed since last restart
Write will restart peak monitor routine
0xDF
MFR_TEMPERATURE1_
PEAK
R/W Word
1°C/Bit
2 Read highest temperature observed since last restart
Write will restart peak monitor routine
0xE1
MFR_IIN_PEAK
R/W Word
10mA/Bit
2 Read highest input current observed since last restart
Write will restart peak monitor routine
0xE3
MFR_CLEAR_PEAKS
W Byte
0, 1 or 2 Clear all peak values, write data is ignored
0xE5 MFR_VOUT_MARGIN_HIGH
R/W Word
0.1%/Bit 2 Same format as MFR_VOUT_COMMAND
0xE7
MFR_SPECIAL_ID
R Word
2 Read 16-bit value (0x8000) that GUI will recognize as
LTC3815
0xE8
MFR_VOUT_COMMAND
R/W Word
0.1%/Bit
2 V_OUT Margining Command ±25% range at 0.1%/bit in
2's compliment. Defaults to 0% at power-up
0xED MFR_VOUT_MARGIN_LOW
R/W Word
0.1%/Bit 2 Same format as MFR_VOUT_COMMAND
0xFA
MFR_RAIL_ADDRESS
R/W Byte
1 or 2 Set Common PMBus Address (B6-B0), Clear B7 to
enable. Set B7 to disable. Valid addresses are 0x00 to
0x7F.
0xFD
MFR_RESET
W Byte
0, 1 or 2 Reset PMBus Interface and ADC to Power-On State
Write data is ignored
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