Datasheet
TPS40400
SLUS930B –APRIL 2011– REVISED OCTOBER 2011
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IOUT/POUT:
An output current warning or fault has occurred. The PMBus specification states that this also
applies to output power. TPS40400 does not support output power warnings or faults.
POWER_GOOD:
The power good signal is negated.
STATUS_VOUT (7Ah)
The STATUS_VOUT command returns one byte of information relating to the status of the converter's output
voltage related faults. The only bits of this register supported by TPS40400 are VOUT_OV Fault and VOUT_UV
Fault.
Command STATUS_VOUT
Format Unsigned binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Function VOUT OV Fault X X VOUT UV Fault X X X X
Default Value 0 0 0 0 0 0 0 0
A "1" in any of these bit positions indicates that:
VOUT OV Fault:
The device has seen the output voltage rise above the VOUT_OV_FAULT_LIMIT threshold.
VOUT UV Fault:
The device has seen the output voltage fall below the VOUT_UV_FAULT_LIMIT threshold.
STATUS_IOUT (7Bh)
The STATUS_IOUT command returns one byte of information relating to the status of the converter’s output
current related faults. The only bits of this register supported by TPS40400 are IOUT_OC Fault and IOUT_OC
Warning.
Command STATUS_IOUT
Format Unsigned binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Function IOUT_OV Fault X IOUT OC Warning X X X X X
Default Value 0 0 0 0 0 0 0 0
A "1" in any of these bit positions indicates that:
IOUT_OV Fault:
The device has seen the output current rise above the level set by IOUT_OC_FAULT_LIMIT.
VOUT_UV Fault:
The device has seen the output current rise relating to the level set by IOUT_OC_WARN_LIMIT.
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