LTC2977 datasheet(121/138 Pages) AD

121 / 138 page

LTM4664A

121

Rev. 0

For more information www.analog.com

PMBus COMMAND DETAILS

STATUS_BYTE Message Contents:

BIT

STATUS BIT NAME

MEANING

BUSY

A fault was declared because the LTM4664A was unable to respond.

OFF

This bit is set if the channel is not providing power to its output, regardless of the reason, including simply not

being enabled.

VOUT_OV

An output overvoltage fault has occurred.

IOUT_OC

An output overcurrent fault has occurred.

VIN_UV

Not supported (LTM4664A returns 0).

TEMPERATURE

A temperature fault or warning has occurred.

CML

A communications, memory or logic fault has occurred.

NONE OF THE ABOVE A fault Not listed in bits[7:1] has occurred.

*ALERT can be asserted if either of these bits is set. They may be cleared by writing a 1 to their bit position in the STATUS_BYTE, in lieu of a CLEAR_

FAULTS command.

This command has one data byte.

STATUS_WORD

The STATUS_WORD command returns a two-byte summary of the channel's fault condition. The low byte of the

STATUS_WORD is the same as the STATUS_BYTE command.

STATUS_WORD High Byte Message Contents:

BIT

STATUS BIT NAME

MEANING

VOUT

An output voltage fault or warning has occurred.

IOUT

An output current fault or warning has occurred.

INPUT

An input voltage fault or warning has occurred.

MFR_SPECIFIC

A fault or warning specific to the LTM4664A has occurred.

POWER_GOOD#

The POWER_GOOD state is false if this bit is set.

FANS

Not supported (LTM4664A returns 0).

OTHER

Not supported (LTM4664A returns 0).

UNKNOWN

Not supported (LTM4664A returns 0).

If any of the bits in the upper byte are set, NONE_OF_THE_ABOVE is asserted.

This command has two data bytes.

STATUS_VOUT

The STATUS_VOUT command returns one byte of VOUT status information.

STATUS_VOUT Message Contents:

BIT

MEANING

VOUT overvoltage fault.

VOUT overvoltage warning.

VOUT undervoltage warning.

VOUT undervoltage fault.

VOUT max warning.

TON max fault.

TOFF max fault.

Not supported (LTM4664A returns 0).

LTC2977 Datasheet(PDF) 121 Page - Analog Devices

LTC2977 Datasheet(HTML) 121 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL