LTC3882_15 Datasheet, PDF (91/104 Pages) Linear Technology – Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management

LTC3882
PMBus COMMAND DETAILS (Fault Response and Communication)
FAULT RESPONSE AND COMMUNICATION
COMMAND NAME
CMD
CODE DESCRIPTION
DATA
DEFAULT
TYPE PAGED FORMAT UNITS NVM VALUE
VIN_OV_FAULT_RESPONSE
0x56 V_IN overvoltage fault response.
R/W Byte Y
Reg
l
0x80
VOUT_OV_FAULT_RESPONSE
0x41 V_OUT overvoltage fault response.
R/W Byte Y
Reg
l
0xB8
VOUT_UV_FAULT_RESPONSE
0x45 V_OUT undervoltage fault response.
R/W Byte Y
Reg
l
0xB8
IOUT_OC_FAULT_RESPONSE
0x47 Output overcurrent fault response.
R/W Byte Y
Reg
l
0x00
OT_FAULT_RESPONSE
0x50 External overtemperature fault response.
R/W Byte Y
Reg
l
0xB8
UT_FAULT_RESPONSE
0x54 External undertemperature fault response. R/W Byte Y
Reg
l
0xB8
MFR_OT_FAULT_RESPONSE
0xD6 Internal overtemperature fault response.
R/W Byte N
Reg
l
0xC0
TON_MAX_FAULT_RESPONSE
0x63 Fault response when
TON_MAX_FAULT_LIMIT is exceeded.
R/W Byte Y
Reg
l
0xB8
MFR_RETRY_DELAY
0xDB Minimum time before retry after a fault.
R/W Word N
L11
ms l 350ms
0xFABC
SMBALERT_MASK
0x1B Mask ALERT Activity.
Block R/W Y
Reg
l See CMD
Details
MFR_GPIO_PROPAGATE
0xD2 Configure status propagation via GPIOn pins. R/W Word Y
Reg
l 0x6993
MFR_GPIO_RESPONSE
0xD5 PWM response when GPIOn pin is low.
R/W Byte Y
Reg
l
0xC0
MFR_FAULT_LOG
0xEE Read fault log data.
R Block N
Reg
MFR_FAULT_LOG_CLEAR
0xEC Clear existing EEPROM fault log.
Send Byte N
Related commands: STATUS_BYTE, STATUS_WORD, MFR_PADS_LTC3882, MFR_RESTART_DELAY, MFR_CHAN_CONFIG_LTC3882, MFR_FAULT_LOG_
STORE, CLEAR_FAULTS
These commands detail programmable device responses for detected faults beyond the hardware-level actions described
in the Operations section. LTC3882 hardware-level fault responses cannot be modified. Refer to Table 1 to Table 4 for
details of fault log contents. PMBus warning event responses are listed under _WARN_LIMIT command details.
VIN_OV_FAULT_RESPONSE
The VIN_OV_FAULT_RESPONSE command instructs the device on what action to take in response to an input overvolt-
age fault. The format for this command is given in Table 13. The device also:
• Sets the INPUT Bit in the STATUS_WORD
• Sets the V_IN Overvoltage Fault Bit in the STATUS_INPUT Command
• Notifies the Host by Asserting ALERT, Unless Masked
This command has one data byte.
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3882f
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