BCM6123XD1E5126YZZ Datasheet, PDF (23/30 Pages) Vicor Corporation – Isolated Fixed-Ratio DC-DC Converter

PMBus™ System Diagram
BCM6123xD1E5126yzz
-OUT
BCM
Digital Isolator
BCM EN
SER-IN
SER-OUT
PRI-OUT-A
PRI-OUT-B
PRI-IN-C
-IN BCM _PRI-COM
SEC-IN-A
SEC-IN-B ^TXD1’
RXD1
SEC-OUT-C
SEC-COM
SCL
5V EXT
RXD4
VDDB
RXD3
VDD
RXD2
NC
RXD1 _{D44TL1A0 NC}
VDD
TXD4
TXD3
NC
SSTOP
10 kΩ
3 kΩ
3 kΩ
VDD
CP
VCC
D
D
SD
Q _Flip-flop RD
SGND
Q
74LVC1G74DC
10 kΩ
FDG6318P
SGND
R1
R2
EN Control
3.3V, at least 20mA
when using 4xDISO
Ref to Digital Isolator
datasheet for more details
SDA Host
SCL
µc
PMBus
The PMBus communication enabled bus converter provides accurate telemetry monitoring and reporting, threshold and warning
limits adjustment, in addition to corresponding status flags.
The BCM internal µC is referenced to primary ground. The Digital Isolator allows UART communication interface with the host Digital
Supervisor at typical speed of 750KHz across the isolation barrier. One of the advantages of the Digital Isolator is its low power
consumption. Each transmission channel is able to draw its internal bias circuitry directly from the input signal being transmitted to
the output with minimal to no signal distortion.
The Digital Supervisor provides the host system µC with access to an array of up to 4 BCMs. This array is constantly polled for status
by the Digital Supervisor. Direct communication to individual BCM is enabled by a page command. For example, the page (0x00)
prior to a telemetry inquiry points to the Digital Supervisor data and pages (0x01 – 0x04) prior to a telemetry inquiry points to the
array of BCMs connected data. The Digital Supervisor constantly polls the BCM data through the UART interface.
The Digital Supervisor enables the PMBus compatible host interface with an operating bus speed of up to 400kHz. The Digital
Supervisor follows the PMBus command structure and specification.
Please refer to the Digital Supervisor data sheet for more details.
BCM^® Bus Converter
Page 23 of 30
Rev 1.1
01/2017
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