Datasheet

TPS40400
www.ti.com SLUS930B –APRIL 2011– REVISED OCTOBER 2011
CML:
A Communications, Memory or Logic fault has occurred.
NONE OF THE ABOVE:
A fault or warning not listed in bit1 through bits 1-7 has occurred, for example an undervoltage
condition or an over current warning condition
STATUS_WORD (78h)
The STATUS_WORD command returns two bytes of information with a summary of the device's fault/warning
conditions. The low byte is identical to the STATUS_BYTE above. The additional byte reports the warning
conditions for output overvoltage and overcurrent, as well as the power good status of the converter.
Command STATUS_WORD (low byte)
Format Unsigned binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Function X OFF VOUT_OV IOUT_OC VIN_UV TEMPERATURE CML NONE OF THE ABOVE
Default Value 0 x 0 0 0 0 0 0
A "1" in any of the low byte (STATUS_BYTE) bit positions indicates that:
OFF:
The device is not providing power to the output, regardless of the reason. In TPS40400, this flag
means that the converter is not enabled.
VOUT_OV:
An output overvoltage fault has occurred.
IOUT_OC:
An output over current fault has occurred.
VIN_UV:
An input undervoltage fault has occurred.
TEMPERATURE:
A temperature fault or warning has occurred.
CML:
A Communications, Memory or Logic fault has occurred.
NONE OF THE ABOVE:
A fault or warning not listed in bits 1-7 has occurred
Command STATUS_WORD (high byte)
Format Unsigned binary
Bit Position 7 6 5 4 3 2 1 0
Access r r r r r r r r
Function VOUT IOUT/POUT X X POWER_GOOD X X X
Default Value 0 0 0 0 0 0 0 0
A "1" in any of the high byte bit positions indicates that:
VOUT:
An output voltage fault or warning has occurred
Copyright © 2011, Texas Instruments Incorporated Submit Documentation Feedback 41
Product Folder Link(s) :TPS40400