BCM3814B60E10A5C02 Datasheet, PDF (33/38 Pages) Vicor Corporation – Isolated, Fixed-Ratio DC-DC Converter

BCM3814x60E10A5yzz
The internal µC Implementation vs.
PMBus™ Specification Rev 1.2
The internal µC 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 internal µC 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
D44TL1A0
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 internal µC 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 internal µC 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. Refer to the BCM datasheet for details.
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 Digital
Supervisor 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 internal µC.
Cycling power to the internal µC will not clear a
BCM Shutdown. The BCM will clear itself once the fault
condition is removed. Refer to the BCM datasheet
for details.
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 internal µC.
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
10.8.7 Device busy
Response to Host
NAK
FFh
X
X
X
X
STATUS_BYTE
CML
X
X
STATUS_CML
Other Fault
Unsupported
Data
X
X
Notes
No response; PEC not supported
X
X
X
X
X
X
Device will ACK own address
BUSY bit in STATUS_BYTE even if
STATUS_WORD is set
BCM^® in a VIA Package
Page 33 of 38
Rev 1.1
05/2016
vicorpower.com
800 927.9474