BCM4414xG0F4440yzz
STATUS_BYTE (78h) and STATUS_WORD (79h)
STATUS_WORD
High Byte
Low Byte
STATUS_BYTE
Not Supported: UNKNOWN FAULT OR WARNING
Not Supported: OTHER
UNIT IS BUSY
UNIT IS OFF
Not Supported: FAN FAULT OR WARNING
Not Supported: VOUT_OV_FAULT
POWER_GOOD Negated*
IOUT_OC_FAULT
VIN_UV_FAULT
STATUS_MFR_SPECIFIC
INPUT FAULT OR WARNING
TEMPERATURE FAULT OR WARNING
IOUT/POUT FAULT OR WARNING
PMBusTM COMMUNCATION EVENT
NONE OF THE ABOVE
Not Supported: VOUT FAULT OR WARNING
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
0
1
1
1
1
0
0
0
1
1
0
1
1
1
1
0
b
* equal to POWER_GOOD#
All fault or warning flags, if set, will remain asserted until
cleared by the host or once the BCM and VDDB power is
removed. This includes undervoltage fault, overvoltage fault,
overvoltage warning, overcurrent warning, overtemperature
fault, overtemperature warning, undertemperature fault, reverse
operation, communication faults and analog controller
shutdown fault.
If the BCM controller is powered through VDDB, it will retain the
last telemetry data and this information will be available to the user
via a PMBus Status request. This is in agreement with the PMBus
standard, which requires that status bits remain set until specifically
cleared. Note that in the case where the BCM VHI is lost, the status
will always indicate an undervoltage fault, in addition to any other
fault that occurred.
Asserted status bits in all status registers, with the exception of
STATUS_WORD and STATUS_BYTE, can be individually cleared.
This is done by sending a data byte with one in the bit position
NONE OF THE ABOVE bit will be asserted if either the
STATUS_MFR_SPECIFIC (80h) or the High Byte of the
STATUS WORD is set.
corresponding to the intended warning or fault to be cleared. Refer
to the PMBus™ Power System Management Protocol Specification
– Part II – Revision 1.2 for details.
STATUS_IOUT (7Bh)
The POWER_GOOD# bit reflects the state of the device and does
not reflect the state of the POWER_GOOD# signal limits. The
POWER_GOOD_ON COMMAND (5Eh) and POWER_GOOD_OFF
COMMAND (5Fh) are not supported. The POWER_GOOD# bit is
set, when the BCM is not in the active state, to indicate that the
powertrain is inactive and not switching. The POWER_GOOD#
bit is cleared, when the BCM is in the active state, 5ms after the
powertrain is activated allowing for soft start to elapse.
POWER_GOOD# and OFF bits cannot be cleared as they always
reflect the current state of the device.
IOUT_OC_FAULT
Not Supported: IOUT_OC_LV_FAULT
IOUT_OC_WARNING
Not Supported: IOUT_UC_FAULT
Not Supported: Current Share Fault
Not Supported: In Power Limiting Mode
Not Supported: POUT_OP_FAULT
Not Supported: POUT_OP_WARNING
The Busy bit can be cleared using CLEAR_ALL Command (03h) or
by writing either data value (40h, 80h) to PAGE (00h) using the
STATUS_BYTE (78h).
7
6
5
4
3
2
1
0
b
1
0
0
1
0
0
0
0
Fault reporting, such as SMBALERT# signal output, and host
notification by temporarily acquiring bus master status is
not supported.
Unsupported bits are indicated above. A one indicates a fault.
BCM® in a VIA™ Package
Page 32 of 43
Rev 1.2
01/2018
VICOR [ VICOR CORPORATION ]
