7.6.35 STATUS_WORD (79h)
The STATUS_WORD command returns two bytes of information with a summary of the device fault and 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) = STATUS_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 |
OVF |
OCF |
x |
OTFW |
CML |
oth |
| Default Value |
0 |
X |
0 |
0 |
0 |
0 |
0 |
1 |
| COMMAND |
STATUS_WORD (high byte) |
| Format |
Unsigned binary |
| Bit Position |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
0 |
| Access |
r |
r |
r |
r |
rE
|
r |
r |
r |
| Function |
VFW |
OCFW |
INPUT |
MFR |
PGOOD_Z |
X |
X |
X |
| Default Value |
0 |
0 |
X |
0 |
X |
0 |
0 |
0 |
A 1 in any of the high byte bit positions indicates that:
VFW An output voltage fault or warning has occurred (OVF or OVW or UVW or UVF or VOUT_MAX_Warning or TONMAXF). Check STATUS_VOUT. Per the PMBus v1.3 spec sections 10.2.4 and 10.2.5, this bit is not clearable through a PMBus write. In contrast, the bit is to be cleared by clearing the bits in STATUS_VOUT that cause this bit to be set.
OCFW An output current warning or fault has occurred (OCF or OCW). Check STATUS_IOUT. Per the PMBus v1.3 spec sections 10.2.4 and 10.2.5, this bit is not clearable through a PMBus write. In contrast, the bit is to be cleared by clearing the bits in STATUS_IOUT that cause this bit to be set.
INPUT INPUT fault or warning in STATUS_INPUT is present. Check STATUS_INPUT. Per the PMBus v1.3 spec sections 10.2.4 and 10.2.5, this bit is not clearable through a PMBus write. In contrast, the bit is to be cleared by clearing the bits in STATUS_INPUT that cause this bit to be set.
MFR An manufacturer specific fault or warning condition has occurred (over temperature fault from Bandgap or IV_PPV1). Check STATUS_MFR_SPECIFIC. Per the PMBus v1.3 spec sections 10.2.4 and 10.2.5, this bit is not clearable through a PMBus write. In contrast, the bit is to be cleared by clearing the bits in STATUS_MFR_SPECIFIC that cause this bit to be set.
PGOOD_Z Power is not good, and the following condition is present: output over or under voltage warning or fault, TON_MAX_FAULT, over temperature warning or fault, over current warning or fault, insufficient input voltage. Please refer to the FAULT RESPONSE table for the possible sources to trigger PGOOD_Z. The signal is unlatched and always represents the current state of the device. The factory default setting for PGOOD_Z mask bit is 1, indicating that PGOOD_Z itself cannot trigger SMBALERT by default. If unmask PGOOD_Z bit, the SMBALERT is set not to trigger before Power Good going high the first time, which is to avoid the device holding up SMBALERT bus when it is not commanded to start up and PGOOD stays low.