BCM6123xD1E5126yzz
PMBus™ System Diagram
-OUT
BCM
EN Control
3.3V, at least 20mA
when using 4xDISO
SCL
Ref to Digital Isolator
datasheet for more details
Digital Isolator
3 kΩ
VDD
3 kΩ
BCM EN
5V EXT
VDDB
SEC-IN-A
SEC-IN-B
PRI-OUT-A
PRI-OUT-B
PRI-IN-C
SER-IN
SER-OUT
-IN BCM
TXD1’
RXD1
RXD4
RXD3
RXD2
RXD1
TXD4
TXD3
SEC-OUT-C
VDD
NC
CP
D
VCC
PRI-COM
SEC-COM
SD
RD
Q
D
D44TL1A0 NC
Q
NC
SSTOP
Flip-flop
VDD
Host
µc
SGND
SDA
SCL
74LVC1G74DC
10 kΩ
PMBus
FDG6318P
R1
R2
10 kΩ
SGND
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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