BCM3814x60E10A5yzz
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#
If the internal µC is still powered, it will retain the last status it
received from the BCM 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 this case where the BCM VHI is lost,
the status will always indicate an under voltage fault, in addition to
any other fault
All fault or warning flags, if set, will remain asserted until
cleared by the host or once the internal µC power is removed.
This includes under voltage fault, overvoltage fault, overvoltage
warning, overcurrent warning, over temperature fault, over
temperature warning, under temperature fault, reverse operation,
communication faults and analog controller shutdown 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
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.
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.
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 anytime the BCM is not in the enabled state, to indicate that
the powertrain is inactive and not switching. The POWER_GOOD#
bit is cleared when the BCM completes the enabling state, 5 ms
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
When Page (00h) is used the POWER_GOOD# bit reflects the OR-
ing of all active BCMs’ POWER_GOOD# bits. When Page
(01h – 04h) is used POWER_GOOD# is clear only when the
BCM is active.
7
6
5
4
3
2
1
0
When Page (00h) is used UNIT IS OFF is SET when all BCMs are
not active. When Page (01h – 04h) is used UNIT IS OFF is clear only
when the BCM is active.
b
1
0
0
1
0
0
0
0
Unsupported bits are indicated above. A one indicates a fault.
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).
Fault reporting, such as SMBALERT# signal output, and host
notification by temporarily acquiring bus master status is
not supported.
BCM® in a VIA Package
Page 30 of 39
Rev 1.4
09/2016
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