BCM3814x60E10A5yzz
ON_OFF_CONFIG Command (02h)
OT_FAULT_LIMIT Command (4Fh),
OT_WARN_ LIMIT Command (51h),
VIN_OV_FAULT_ LIMIT Command (55h),
VIN_OV_WARN_ LIMIT Command (57h),
IIN_OC_FAULT_ LIMIT Command (5Bh),
IIN_OC_WARN_ LIMIT Command (5Dh)
Reserved for Future Use
Unit does not power up until commanded by the
CONTROL pin and operation command
Unit requires that the on/off portion of the
OPERATION command is instructing the unit to run[1]
Unit requires the CONTROL pin to be asserted
to start the unit[2]
The values of these registers are set in non volatile memory and
can only be written when the BCMs are disabled.
Not supported: Polarity of the CONTROL pin[3]
Turn off the output and stop transferring
energy to the output as fast as possible[4]
The values of the above mentioned fault and warning are set by
default to a 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.
7
6
5
4
3
2
1
0
b
0
0
0
1
1
1
0
1
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.
[1] The BCM Enable pin is ALWAYS to be asserted for powerup. The
BCM_EN_POLARITY command (D0h) bit[(1) defines the logic level
required for the control pin (i.e BCM Enable pin) to be asserted.
[2] With respect to the BCM EN Control Pin if used in system
[3] See MFR_SPECIFIC_00 / BCM_EN_POLARITY to change the Polarity
of the BCM Enable Pin
The SET_ALL_THRESHOLDS COMMAND (D5h) combines in one
block over temperature 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.
[4] The BCM powertrain once disabled cannot sink current
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 under voltage setting using the
DISABLE_FAULT COMMAND (D7h).
CLEAR_FAULTS Command (03h)
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 internal µC. Registered faults
will not be cleared when shutting down the BCM powertrain by
recycling the BCM high side voltage, or toggling the BCM EN pin,
or sending the OPERATION command.
All FAULT_RESPONSE commands are unsupported. The BCM
powertrain supervisory limits and powertrain protection will behave
as described in the BCM datasheet. In general, once a fault is
detected, the BCM powertrain will shut down and attempt to auto
restart after a predetermined delay.
CAPABILITY Command (19h)
TON_DELAY Command (60h)
Packet Error Checking is not supported
Maximum supported bus speed is 400 KHz
The value of this register word is set in non volatile memory and
can only be written when the BCMs are disabled.
The maximum possible delay is 100ms. Default value is set to (00h).
Follow this equation below to interpret the reported value.
The Device does not have SMBALERT# pin and does
not support the SMBus Alert Response protocol
Reserved
TON_DELAYACTUAL = tREPORTED • 10-3(s)
Staggering startup in an array is possible with TON_DELAY
Command. This delay will be in addition to any startup delay
inherent in the BCM module. For example: startup delay from
application of VHI is typically 20ms whereas startup with EN pin is
typically 250µs. When TON_DELAY is greater than zero, the set
delay will be added to both.
7
6
5
4
3
2
1
0
b
0
0
1
0
0
0
0
0
The internal µC 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.
BCM® in a VIA Package
Page 29 of 39
Rev 1.4
09/2016
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