BCM4414XD1E13A2YZZ Datasheet, PDF (37/42 Pages) Vicor Corporation – Isolated Fixed-Ratio DC-DC Converter

BCM4414xD1E13A2yzz
The BCM Controller Implementation vs.
PMBus™ Specification Rev 1.2
The BCM controller is an I²C compliant, SMBus™ compatible device
and PMBus command compliant device. This section denotes some
deviation, perceived as differences from the PMBus Part I and Part II
specification Rev 1.2.
1. The PMBus interface meets all Part I and II PMBus specification
requirements with the following differences to the
transport requirement.
Unmet DC parameter Implementation vs SMBus™ spec
Symbol
Parameter
V_IL[a]
V_IH[a]
I_{LEAK_PIN[b]}
Input Low Voltage
Input High Voltage
Input Leakage per Pin
PMBus
Interface
Min Max
- 0.99
2.31 -
10 22
SMBus™
Rev 2.0 _Units
Min Max
-
0.8
V
2.1 V_{VDD_IN} V
-
±5 µA
[a] _{VVDD_IN = 3.3V}
[b] _{VBUS = 5V}
2. The BCM accepts 38 PMBus command codes.
Implemented commands execute functions as described in the
PMBus specification.
n Deviations from the PMBus specification:
a. Section 15, fault related commands
• The limits and Warnings unit implemented is percentage
(%) a range from decimal (0-100) of the factory set limits.
3. The unsupported PMBus command code response as described
in the Fault Management and Reporting:
n Deviations from the PMBus specification:
a. PMBus section 10.2.5.3, exceptions
• The busy bit of the STATUS_BYTE as implemented can
be cleared (80h). In order to maintain compatibility with
the specification, (40h) can also be used.
n Manufacturer Implementation of the PMBus Spec
a. PMBus section 10.5, setting the response to a detected
fault condition
• All powertrain responses are pre-set and cannot be
changed.
b. PMBus section 10.6, reporting faults and warnings
to the Host
• SMBALERT# signal and Direct PMBus Device to Host
Communication are not supported. However, the
PMBus™ interface will set the corresponding fault status
bits and will wait for the host to poll.
c. PMBus section 10.7, clearing a shutdown due to a fault
• There is no RESET pin or EN pin in the BCM. Cycling
power to the BCM will not clear a BCM Shutdown. The
BCM will clear itself once the fault condition is removed.
d. PMBus Section 10.8.1, corrupted data transmission faults:
• Packet error checking is not supported.
Data Transmission Faults Implementation
This section describes data transmission faults as implemented in the BCM controller.
Section
Description
10.8.1
10.8.2
10.8.3
10.8.4
10.8.5
10.8.6
Corrupted data
Sending too few bits
Reading too few bits
Host sends or reads too
few bytes
Host sends too many
bytes
Reading too many bytes
Response to Host
NAK
FFh
X
X
STATUS_BYTE
STATUS_CML
CML
Other Fault
Unsupported
Data
X
X
X
X
X
X
X
X
X
X
10.8.7 Device busy
X
X
Notes
No response; PEC not supported
Device will ACK own address
BUSY bit in STATUS_BYTE even if
STATUS_WORD is set
BCM^® in a VIA Package
Page 37 of 42
Rev 1.5
10/2016
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