Description
The USB to SMBus
TM
Interface board allows
communication between a Zilker Labs
Digital-DC™ evaluation board and a PC. This
interface board has been designed to bridge
PMBus commands from a PC application
program to the SMBus. The PMBus command
set is used to configure a Digital-DC device as
well as monitor the power supply. PMBus
TM
commands are accessed using the Zilker Labs
interface software from a PC running Microsoft
Windows. Refer to AN13 –
PMBus Command
Set
for more information on PMBus commands.
The USB to SMBus interface board is used by
connecting the SMBus interface connector
directly to a Zilker Labs evaluation board. The
SMBus connector is found on the lower left-
hand side of each evaluation board. Refer to the
Zilker Labs’ product evaluation board quick
start guide and product data sheet for more
information.
Features
•
•
•
•
•
•
SMBus control via USB
SMBus 2.0 and I
2
C 2.1 compatible
PMBus compliant
Self powered from USB
Pre-installed firmware
Provides SMBus reference rail
Applications
This board has been designed to operate for the
following conditions:
•
•
•
Interface to Digital-DC EVBs
f
SMBus
= 100 kHz
Temperature range: 0°C to +70°C
Figure 1. USB to SMBus Interface
USB
Conn
USB
to
UART
MCU
UART to
SMBus
SMBus
Conn
Figure 2. Block Diagram
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