LTC2977 datasheet(120/138 Pages) AD

120 / 138 page

LTM4664A

120

Rev. 0

For more information www.analog.com

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 50 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.

SMBALERT_MASK Default Setting: (Refer Also to Figure 2)

STATUS RESISTER

ALERT Mask Value MASKED BITS

STATUS_VOUT

0x00

None

STATUS_IOUT

0x00

None

STATUS_TEMPERATURE

0x00

None

STATUS_CML

0x00

None

STATUS_INPUT

0x00

None

STATUS_MFR_SPECIFIC

0x11

Bit 4 (internal PLL unlocked), bit 0 (FAULT pulled low by external device)

PMBus COMMAND DETAILS

SLAVE

ADDRESS

SMBALERT_MASK

COMMAND CODE

BLOCK COUNT

(= 1)

W A

STATUS_x

COMMAND CODE

1 1

…

BLOCK COUNT

(= 1)

NA P

4664A F57

1 1

MASK BYTE

SLAVE

ADDRESS

SLAVE

ADDRESS

SMBALERT_MASK

COMMAND CODE

STATUS_x

COMMAND CODE

W A

1 1

MASK BYTE

4664A F56

Figure 53. Example of Writing SMBALERT_MASK

Figure 54. Example of Reading SMBALERT_MASK

MFR_CLEAR_PEAKS

The MFR_CLEAR_PEAKS command clears the MFR_*_PEAK data values. A MFR_RESET command will also clear the

MFR_*_PEAK data values.

This write-only command has no data bytes.

STATUS_BYTE

The STATUS_BYTE command returns one byte of information with a summary of the most critical faults. This is the

lower byte of the status word.

LTC2977 Datasheet(PDF) 120 Page - Analog Devices

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