LTM4686BEVPBF datasheet(110/130 Pages) AD

110 / 130 page

LTM4686B

110

Rev. 0

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APPENDIX C: PMBUS COMMAND DETAILS

set and the host notified by asserting the ALERT pin low. CLEAR_FAULTS can take up to 10µs to process. If a fault

occurs within that time frame it may be cleared before the status register is set.

This write-only command has no data bytes.

The CLEAR_FAULTS does not cause a unit that has latched off for a fault condition to restart. Units that have shut

down for a fault condition are restarted when:

• The output is commanded through the RUN pin, the OPERATION command, or the combined action of the RUN pin

and OPERATION command, to turn off and then to turn back on, or

• MFR_RESET or RESTORE_USER_ALL command is issued.

• Bias power is removed and reapplied to the integrated circuit

MFR_CLEAR_PEAKS

The MFR_CLEAR_PEAKS command clears the MFR_*_PEAK data values. A MFR_RESET or RESTORE_USER_ALL

will initiate this command.

This write-only command has no data bytes.

SMBALERT_MASK

The SMBALERT_MASK command can be used to prevent a particular status bit or bits from asserting ALERT as they

are asserted.

Figure 58 shows an example of the Write Word format used to set an ALERT mask, in this case without PEC. The bits in

the mask byte align with bits in the specified status register. For example, if the STATUS_TEMPERATURE command code

is sent in the first data byte, and the mask byte contains 0x40, then a subsequent External Overtemperature Warning

would still set bit 6 of STATUS_TEMPERATURE but not assert ALERT. All other supported STATUS_TEMPERATURE

bits would continue to assert ALERT if set.

Figure 59 shows an example of the Block Write – Block Read Process Call protocol used to read back the present state

of any supported status register, again without PEC.

SMBALERT_MASK cannot be applied to STATUS_BYTE, STATUS_WORD, MFR_COMMON or MFR_PADS. Factory

default masking for applicable status registers is shown below. Providing an unsupported command code to SMBALERT_

MASK will generate a CML for Invalid/Unsupported Data.

Figure 58. Example of Setting SMBALERT_MASK

Figure 59. Example of Reading SMBALERT_MASK

SLAVE

ADDRESS

SMBALERT_MASK

COMMAND CODE

STATUS_x

COMMAND CODE

W A

1 1

MASK BYTE

4686B F58

SLAVE

ADDRESS

SMBALERT_MASK

COMMAND CODE

BLOCK COUNT

(= 1)

W A

STATUS_x

COMMAND CODE

1 1

…

BLOCK COUNT

(= 1)

NA P

4686B F59

1 1

MASK BYTE

SLAVE

ADDRESS

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