BCM3814X60E10A5YZZ Datasheet, PDF (33/39 Pages) Vicor Corporation – Isolated Fixed-Ratio DC-DC Converter

BCM3814x60E10A5yzz
BCM_EN_POLARITY Command (D0h)
SET_ALL_THRESHOLDS Command (D5h)
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
BCM EN Pin Polarity
Reserved
76543210
00000010b
SET_ALL_THRESHOLDS_BLOCK (6 Bytes)
IOUT_OC_WARN_ LIMIT
IOUT_OC_FAULT_ LIMIT
VIN_OV_WARN_ LIMIT
VIN_OV_FAULT_ LIMIT
OT_WARN_LIMIT
OT_FAULT_LIMIT
543210
64 64 64 64 64 64 h
The value of this register is set in non‐volatile memory and can only
be written when the BCMs are disabled.
When PAGE COMMAND (00h) data byte is equal to (01h – 04h),
this command defines the polarity of the EN pin. If BCM_EN_
POLARITY is set, the BCM will startup once V_HI is greater than the
under voltage threshold.
The BCM EN PIN is internally pulled-up to 3.3V. If the BCM_EN_
POLARITY is cleared, an external pull-down is then required.
Applying V_HI greater than the under voltage threshold will not
suffice to start the BCM.
READ_K_FACTOR Command (D1h)
If PAGE data byte is equal to (01h - 04h) command will return a
reported individual BCMs K factor in the following format:
K_FACTOR_ACTUAL = K_FACTOR_REPORTED • 2 ^-16(V/V)
The K factor is defined in a BCM to represent the ratio of the
transformer winding and hence is equal to V_LO / V_HI.
READ_BCM_ROUT Command (D4h)
If PAGE data byte is equal to (01h - 04h) command will return
a reported individual BCM’s LO side resistance in the following
format:
BCM_R_{LO_ACTUAL} = BCM_R_{LO_REPORTED} • 10 ^-5(Ω)
BCM^® in a VIA Package
Page 33 of 39
Rev 1.4
09/2016
Values of this register block is set in non‐volatile memory and can
only be written when the BCMs are disabled.
This command provides a convenient way to configure all the
limits, or any combination of limits described previously using one
command.
V_HI Overvoltage, Overcurrent and Overtemperature values are all
set to 100% of the BCM datasheet supervisory limits by default
and can only be set to a lower percentage.
To leave a particular threshold unchanged, set the corresponding
threshold data byte to a value greater than (64h).
DISABLE_FAULT Command (D7h)
MSB
DISABLE_FAULT
LSB
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
VIN_UV_FAULT
Reserved
Reserved
Reserved
IOUT_OC_FAULT
Reserved
VIN_OV_FAULT
Reserved
Reserved
Reserved
7 6 5 4 3 2 1 07 6 5 4 3 2 1 0
0100000000101000 b
Unsupported bits are indicated above. A one indicates that the
supervisory fault associated with the asserted bit is disabled.
The value of these registers is set in non‐volatile memory and can
only be written when the BCMs are disabled.
This command allows the host to disable the supervisory faults
and respective statuses. It does not disable the powertrain analog
protections or warnings with respect to the set limits in the SET_
ALL_THRESHOLDS Command.
The HI side undervoltage can only be disabled to a pre‐set low limit
as shown in the functional reporting range in the BCM data sheet.
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