LTM4682 datasheet(83/130 Pages) AD

83 / 130 page

LTM4682

Rev. 0

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PMBus COMMAND DETAILS

MFR_ADDRESS

The MFR_ADDRESS command byte sets the 7 bits of the PMBus subordinate address for this device.

Setting this command to a value of 0x80 disables device addressing. The GLOBAL device address, 0x5A and 0x5B,

cannot be deactivated. If RCONFIG is set to ignore, the ASEL_nn pins are still used to determine the LSB of the chan-

nel address. If the ASEL_01 and ASEL_23 pins are both open, the LTM4682 will use the address value stored in NVM.

If the ASEL_nn pins are open, the LTM4682 will use the lower 4 bits of the MFR_ADDRESS value stored in NVM to

construct the effective address of the part.

This command has one data byte.

MFR_RAIL_ADDRESS

The MFR_RAIL_ADDRESS command enables direct device address access to the PAGE-activated channel. The value

of this command should be common to all devices attached to a single power supply rail.

The user should only perform command writes to this address. If a read is performed from this address and the rail

devices do not respond with EXACTLY the same value, the LTM4682 will detect bus contention and may set a CML

communications fault.

Setting this command to a value of 0x80 disables rail device addressing for the channel.

This command has one data byte.

GENERAL CONFIGURATION COMMANDS

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS

NVM

DEFAULT

VALUE

MFR_CHAN_CONFIG

0xD0

Configuration bits that are channel specific. R/W Byte

Reg

0x1D

MFR_CONFIG_ALL

0xD1

General configuration bits.

R/W Byte

Reg

0x21

MFR_CHAN_CONFIG

General purpose configuration command common to multiple Analog Devices’ products.

BIT

MEANING

Reserved

Disable RUN Low. When asserted, the RUN pin is not pulsed low if commanded OFF.

Enable Short Cycle recognition if this bit is set to a 1.

SHARE_CLOCK control. If SHARE_CLOCK is held low, the output is disabled.

No FAULT ALERT, ALERT is not pulled low if FAULT is pulled low externally. Assert this bit if either POWER_GOOD or VOUT_UVUF are

propagated on FAULT.

Disables the VOUT decay value requirement for MFR_RETRY_TIME and tOFF(MIN) processing. When this bit is set to a 0, the output must decay to

less than 12.5% of the programmed value for any action that turns off the rail, including a fault, an OFF/ON command, or a toggle of RUN from

high to low to high.

This command has one data byte.

LTM4682 Datasheet(PDF) 83 Page - Analog Devices

LTM4682 Datasheet(HTML) 83 Page - Analog Devices

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