On/Off/Margin - Analog Devices LTM4683 Manual

LTM4683
PMBus COMMAND DETAILS
A ShortCycle event occurs whenever the PWM channel is commanded back On or reactivated, after the part has been
commanded Off and is processing either the TOFF_DELAY or the TOFF_FALL states. The PWM channel can be turned
On/Off through the RUN pin or the PMBus OPERATION command.
If the PWM channel is reactivated during the TOFF_DELAY, the part will perform the following:
1. Immediately tri-state the PWM channel output.
2. Start the retry delay timer as specified by the t
3. After the t value has expired, the PWM channel will proceed to the TON_DELAY state and the STATUS_
OFF(MIN)
MFR_SPECIFIC bit #1 will assert.
If the PWM channel is reactivated during the TOFF_FALL, the part will perform the following:
1. Stop ramping down the PWM channel output.
2. Immediately tri-state the PWM channel output.
3. Start the retry delay timer as specified by the t
4. After the t value has expired, the PWM channel will proceed to the TON_DELAY state, and the STATUS_
OFF(MIN)
MFR_SPEFIFIC bit #1 will assert.
If the ShortCycle event occurs and the ShortCycle MFR_CHAN_CONFIG bit is not set, the PWM channel state machine
will complete its TOFF_DELAY and TOFF_FALL operations as previously commanded by the user.
MFR_CONFIG_ALL
General-purpose configuration command common to multiple ADI products.
BIT MEANING
7 Enable fault logging
6 Ignore resistor configuration pins
5 Mask PMBus, Part II, Section 10.9.1 Violations
4 Disable SYNC output
3 Enable 255ms PMBus timeout
2 A valid PEC is required for PMBus writes to be accepted. If this bit is not
set, the part will accept commands with invalid PEC.
1 Enable the use of PMBus clock stretching
0 Execute CLEAR_FAULTS on the rising edge of either RUN pin
This command has one data byte.

ON/OFF/MARGIN

CMD
COMMAND NAME CODE
ON_OFF_CONFIG 0x02
OPERATION 0x01
MFR_RESET 0xFD
86
DESCRIPTION
RUN pin and PMBus bus on/off command configuration.
Operating mode control. On/off, margin high, and
margin low.
Commanded reset without requiring a power-down.
For more information
.
OFF(MIN)
.
OFF(MIN)
TYPE
R/W Byte
R/W Byte
Send Byte
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DATA
PAGED FORMAT UNITS NVM
Y Reg Y
Y Reg Y
N
DEFAULT
VALUE
0x1E
0x80
NA
Rev. 0