TPS40422_16 Datasheet, PDF (40/71 Pages) Texas Instruments – Dual-Output or Two-Phase Synchronous Buck Controller with PMBus Interface

TPS40422
SLUSAQ4E – OCTOBER 2011 – REVISED SEPTEMBER 2016
www.ti.com
8.6.1.20 STATUS_BYTE (78h)
STATUS_BYTE is a paged register. The STATUS_BYTE command returns one byte of information with a
summary of the most critical device faults. Three fault bits are flagged in this particular command: output
overvoltage, output overcurrent, and over-temperature. The STATUS_BYTE reports communication faults in the
CML bit. Other communication faults set the NONE OF THE ABOVE bit.
COMMAND
Format
Bit Position
Access
Function
Default Value
7
6
5
4
r
r
r
r
X OFF VOUT_OV IOUT_OC
0
x
0
0
A "1" in any of these bit positions indicates that:
STATUS_BYTE
Unsigned binary
3
2
r
r
VIN_UV TEMPERATURE
0
0
1
r
CML
0
0
r
NONE OF THE ABOVE
0
OFF:
The device is not providing power to the output, regardless of the reason. In device , 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 bit1 through bits 1-7 has occurred, for example an undervoltage
condition or an over current warning condition
8.6.1.21 STATUS_WORD (79h)
STATUS_WORD is a paged register. 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
Format
Bit Position
Access
Function
Default Value
STATUS_WORD (low byte)
Unsigned binary
7
6
5
4
3
2
1
0
r
r
r
r
r
r
r
r
X
OFF
VOUT_OV IOUT_OC VIN_UV TEMPERATURE CML NONE OF THE ABOVE
0
x
0
0
0
0
0
0
40
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