LM5064PMHSLASHNOPB datasheet(42/64 Pages) TI2

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LM5064

SNVS718E – JUNE 2011 – REVISED FEBRUARY 2013

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MFR_SPECIFIC_08: ALERT_MASK (D8h)

The ALERT_MASK command is used to mask the SMBA when a specific fault or warning has occurred. Each bit

corresponds to one of the 14 different analog and digital faults or warnings that would normally result in an

SMBA being asserted. When the corresponding bit is high, that condition will not cause the SMBA to be

asserted. If that condition occurs, the registers where that condition is captured will still be updated (STATUS

registers, DIAGNOSTIC_WORD) and the external MOSFET gate control will still be active (VIN_OV_FAULT,

VIN_UV_FAULT, IIN/PFET_FAULT, CB_FAULT, OT_FAULT). This register is accessed with the PMBus Read /

Write Word protocol. The VIN UNDERVOLTAGE FAULT flag will default to 1 on startup, however, it will be

cleared to 0 after the first time the input voltage increases above the resistor-programmed UVLO threshold.

Table 29. ALERT_MASK Definitions

BIT

NAME

DEFAULT

VOUT UNDERVOLTAGE WARN

IIN LIMIT WARN

VIN UNDERVOLTAGE WARN

VIN OVERVOLTAGE WARN

POWER GOOD

OVERTEMP WARN

Not Used

OVERPOWER LIMIT WARN

Not Used

EXT_MOSFET_SHORTED

VIN UNDERVOLTAGE FAULT

VIN OVERVOLTAGE FAULT

IIN/PFET FAULT

OVERTEMPERATURE FAULT

CML FAULT (Communications Fault)

CIRCUIT BREAKER FAULT

MFR_SPECIFIC_09: DEVICE_SETUP (D9h)

The DEVICE_SETUP command may be used to override pin settings to define operation of the LM5064 under

host control. This command is accessed with the PMBus read / write byte protocol.

Table 30. DEVICE_SETUP Byte Format

Bit

Name

Meaning

7:5

Retry setting

111 = Unlimited retries

110 = Retry 16 times

101 = Retry 8 times

100 = Retry 4 times

011 = Retry 2 times

010 = Retry 1 time

001 = No retries

000 = Pin configured retries

Current limit setting

0 = High setting (50 mV)

1 = Low setting (26 mV)

CB/CL Ratio

0 = Low setting (1.8/1.9x for 26/50 mV)

1 = High setting (3.6/3.7x for 26/50 mV)

Current Limit Configuration

0 = Use pin settings

1 = Use SMBus settings

Unused

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