LTM2987 datasheet(71/114 Pages) AD

71 / 114 page

LTC2971

Rev. 0

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STATUS_BYTE

The STATUS_BYTE command returns the summary of the most critical faults or warnings which have occurred, as

shown in the following table. STATUS_BYTE is a subset of STATUS_WORD and duplicates the same information.

STATUS_BYTE Data Contents

BIT(S) SYMBOL

OPERATION

b[7] Status_byte_busy

Same as Status_word_busy.

b[6] Status_byte_off

Same as Status_word_off.

b[5] Status_byte_vout_ov

Same as Status_word_vout_ov.

b[4] Status_byte_iout_oc

Not supported. Always returns 0.

b[3] Status_byte_vin_uv

Same as Status_word_vin_uv.

b[2] Status_byte_temp

Same as Status_word_temp.

b[1] Status_byte_cml

Same as Status_word_cml.

b[0] Status_byte_high_byte Same as Status_word_high_byte.

STATUS_WORD

The STATUS_WORD command returns two bytes of information with a summary of the unit’s fault condition. Based

on the information in these bytes, the host can get more information by reading the appropriate detailed status register.

The low byte of the STATUS_WORD is the same register as the STATUS_BYTE command.

STATUS_WORD Data Contents

BIT(S) SYMBOL

OPERATION

b[15] Status_word_vout

An output voltage fault or warning has occurred. See STATUS_VOUT.

b[14] Status_word_iout

An output current warning has occurred. See STATUS_IOUT.

b[13] Status_word_input

An input voltage fault or warning has occurred. See STATUS_INPUT.

b[12] Status_word_mfr

A manufacturer specific fault has occurred. See STATUS_MFR._SPECIFIC.

b[11] Status_word_power_not_good The PWRGD pin, if enabled, is negated. Power is not good.

b[10] Status_word_fans

Not supported. Always returns 0.

b[9] Status_word_other

Not supported. Always returns 0.

b[8] Status_word_unknown

Not supported. Always returns 0.

b[7] Status_word_busy

Device busy when PMBus command received. See OPERATION: Processing Commands.

b[6] Status_word_off

This bit is asserted if the unit is not providing power to the output, regardless of the reason, including simply

not being enabled. The off-bit is clear if unit is allowed to provide power to the output.

b[5] Status_word_vout_ov

An output overvoltage fault has occurred.

b[4] Status_word_iout_oc

Not supported. Always returns 0.

b[3] Status_word_vin_uv

A VIN undervoltage fault has occurred.

b[2] Status_word_temp

A temperature fault or warning has occurred. See STATUS_TEMPERATURE.

b[1] Status_word_cml

A communication, memory or logic fault has occurred. See STATUS_CML.

b[0] Status_word_high_byte

A fault/warning not listed in b[7:1] has occurred or Status_word_power_not_good = 1.

PMBus COMMAND DESCRIPTION

LTM2987 Datasheet(PDF) 71 Page - Analog Devices

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