LM5056 datasheet(19/46 Pages) TI

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LM5056, LM5056A

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SNVS827A – OCTOBER 2012 – REVISED APRIL 2013

Standard PMBus Commands

CLEAR_FAULTS (03h)

The CLEAR_FAULTS command is a standard PMBus command that resets all stored warning and fault flags

and the SMBA signal. If a fault or warning condition still exists when the CLEAR_FAULTS command is issued,

the SMBA signal may not clear or will reassert almost immediately. This command uses the PMBus send byte

protocol.

CAPABILITY (19h)

The CAPABILITY command is a standard PMBus command that returns information about the PMBus functions

supported by the LM5056/LM5056A/LM5056/LM5056AA. This command is read with the PMBus read byte

protocol.

Table 2. CAPABILITY Register

VALUE

MEANING

DEFAULT

B0h

Supports packet error check, 400 Kbits/s, supports SMBus alert

B0h

VOUT_UV_WARN_LIMIT (58h)

The VOUT_UV_WARN_LIMIT command is a standard PMBus command that allows configuring or reading the

threshold for the VOUT under-voltage warning detection. Reading and writing to this register should use the

coefficients shown in the Table 39. Accesses to this command should use the PMBus read or write word

protocol. If the measured value of VOUT falls below the value in this register, VOUT under-voltage warn flags are

set and the SMBA signal is asserted.

Table 3. VOUT_UV_WARN_LIMIT Register

VALUE

MEANING

DEFAULT

0001h – 0FFFh

VOUT under-voltage warning detection threshold

0000h (disabled)

0000h

VOUT under-voltage warning disabled

n/a

OT_FAULT_LIMIT (4Fh)

The OT_FAULT_LIMIT command is a standard PMBus command that allows configuring or reading the threshold

for the over-temperature fault detection. Reading and writing to this register should use the coefficients shown in

the Table 39. Accesses to this command should use the PMBus read or write word protocol. If the measured

temperature exceeds this value, an over-temperature fault is triggered and the SMBA signal is asserted. After the

measured temperature falls below the value in this register, the CLEAR_FAULTS command (03h) should be sent

to de-assert the SMBA signal. A single temperature measurement is an average of 16 round-robin cycles;

therefore, the minimum temperature fault detection time is 16 ms.

Table 4. OT_FAULT_LIMIT Register

VALUE

MEANING

DEFAULT

0000h – 0FFEh

Over-temperature fault threshold value

0960h (150°C)

0FFFh

Over-temperature fault detection disabled

n/a

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