LTC3882_15 Datasheet, PDF (69/104 Pages) Linear Technology – Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management

LTC3882
PMBus COMMAND DETAILS (General Device Configuration)
MFR_CONFIG_ALL_LTC3882
The MFR_CONFIG_ALL_LTC3882 command provides device-level configuration common to multiple LTC PMBus products.
Bit Definitions:
BIT MEANING
7
Enable fault logging.
6
Ignore resistor configuration pins. Does not apply to ASEL0 or ASEL1.
5
(Reserved).
4
Disable SYNC output.
3
Enable 255ms PMBus timeout.
2
Require valid PEC for PMBus write.
1
Enable PMBus clock stretching.
0
Execute CLEAR_FAULTS on rising edge of either RUN pin.
If a legal command is received with an invalid PEC, the LTC3882 will not execute the command, regardless of the state
of bit 2. If clock stretching is enabled, the LTC3882 only uses it as required, generally above SCL rates of 100kHz.
This command has one data byte.
ON, OFF AND MARGIN CONTROL
COMMAND NAME
CMD
CODE DESCRIPTION
ON_OFF_CONFIG
0x02 RUN pin and PMBus on/off command
configuration.
OPERATION
0x01 On, off and margin control.
MFR_RESET
0xFD Force full reset without removing power.
DATA
TYPE PAGED FORMAT
R/W Byte Y
Reg
UNITS NVM
l
DEFAULT
VALUE
0x1E
R/W Byte Y
Reg
Send Byte N
l
0x80
ON_OFF_CONFIG
The ON_OFF_CONFIG command specifies the combination of RUNn pin input state and PMBus commands needed to
turn the PWM channel on and off.
Supported Values:
VALUE MEANING
0x1F OPERATION value and RUNn pin must both command the device to start/run. Device executes immediate off when commanded off.
0x1E OPERATION value and RUNn pin must both command the device to start/run. Device uses TOFF_ command values when commanded off.
0x17 RUNn pin control with immediate off when commanded off. OPERATION on/off control ignored.
0x16 RUNn pin control using TOFF_ command values when commanded off. OPERATION on/off control ignored.
Programming an unsupported ON_OFF_CONFIG value will generate a CML fault and the command will be ignored.
This command has one data byte.
For more information www.linear.com/LTC3882
3882f
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