BCM4414xG0F4440yzz
CLEAR_FAULTS Command (03h)
OT_FAULT_LIMIT Command (4Fh),
OT_WARN_ LIMIT Command (51h),
This command clears all status bits that have been previously set.
Persistent or active faults are re-asserted again once cleared. All
faults are latched once asserted in the BCM controller. Registered
faults will not be cleared when shutting down the BCM
powertrain by recycling the BCM high side voltage or sending
the OPERATION command.
VIN_OV_FAULT_ LIMIT Command (55h),
VIN_OV_WARN_ LIMIT Command (57h),
IIN_OC_FAULT_ LIMIT Command (5Bh),
IIN_OC_WARN_ LIMIT Command (5Dh)
The values of these registers are set in non-volatile memory and
can only be written when the BCM is disabled.
CAPABILITY Command (19h)
The values of the above mentioned faults and warnings are set by
default to 100% of the respective BCM model supervisory limits.
However, these limits can be set to a lower value. For example: In
order for a limit percentage to be set to 80%, one would send a
write command with a (50h) Data Word.
Packet Error Checking is not supported
Maximum supported bus speed is 400kHz
The Device does not have SMBALERT# pin and does
not support the SMBus Alert Response protocol
Any values outside the range of (00h – 64h) sent by a host will be
rejected, will not override the currently stored value and will set the
Unsupported Data bit in STATUS_CML.
Reserved
The SET_ALL_THRESHOLDS COMMAND (D5h) combines in one
block overtemperature fault and warning limits, VHI overvoltage
fault and warning limits as well as ILO overcurrent fault and warning
limits. A delay prior to a read command of up to 200ms following a
write of new value is required.
7
6
5
4
3
2
1
0
b
0
0
1
0
0
0
0
0
The VIN_UV_WARN_LIMIT (58h) and VIN_UV_FAULT_LIMIT
(59h) are set by the factory and cannot be changed by the host.
However, a host can disable the undervoltage setting using the
DISABLE_FAULT COMMAND (D7h).
The BCM controller returns a default value of 20h. This value
indicates that the PMBus™ frequency supported is up to 400kHz
and that both Packet Error Checking (PEC) and SMBALERT# are
not supported.
All FAULT_RESPONSE commands are unsupported. The BCM
powertrain supervisory limits and powertrain protection will behave
as described in the Electrical Specifications. In general, once a fault
is detected, the BCM powertrain will shut down and attempt to
auto-restart after a predetermined delay.
TON_DELAY Command (60h)
The value of this register word is set in non-volatile memory and
can only be written when the BCM is disabled.
The maximum possible delay is 100ms. Default value is set
to (00h). The reported value can be interpreted using the
following equation.
TON_DELAYACTUAL = tREPORTED • 10-3(s)
Staggering start up in an array is possible with the TON_DELAY
Command. This delay will be in addition to any start up delay
inherent in the BCM module. For example: start up delay from
application of VHI is typically 20ms. When TON_DELAY is greater
than zero, the set delay will be added to it.
BCM® in a VIA™ Package
Page 31 of 43
Rev 1.2
01/2018
VICOR [ VICOR CORPORATION ]
