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MAX5946L Evaluation Kit/Evaluation System
General-Purpose Two-Wire Interface Utility
The General-Purpose Two-Wire Interface Utility is used
to communicate with the MAX7313 and thus controls or
reads back signals from the MAX5946L. The utility con-
figures the SMBus interface parameters such as Start
and Stop bits, Acknowledgements, and clock timing.
The Two-Wire Interface screen allows you to send
general-purpose SMBus commands using the
SMBusWriteByte and SMBusReadByte . All data is in
hexadecimal format.
The “ Hunt for active listeners ” button scans the entire
2-wire address space, reporting each address that is
acknowledged. The SMBusWriteByte transmits the
device address, command, and one byte of data. The
SMBusReadByte transmits the device address, a com-
mand, and then retransmits the device address and
reads one byte of data.
Software Quick Start
1) Install shunts on pins 2 and 3 of jumpers JU5–JU8
(computer control) on the MAX5946L EV kit.
2) Connect the CMODUSB interface board to the
MAX5946L EV kit’s J4 connector.
3) Set both CMODUSB SW1 switches to enable.
These provide pullup resistors for the SMBus.
4) Connect the computer’s USB port to the CMODUSB
interface board with a USB cable.
Reading from channels A or B:
? To read a specific channel, use the
SMBusReadByte command. Use the 0x00
command byte for reading the ports on channel
A. Use the SMBusReadByte command and the
0x01 command byte for reading the ports on
channel B.
Writing to channels A or B:
? To write a specific channel, use the
SMBusWriteByte command. Use the 0x02
command byte for writing to the ports on chan-
nel A. Use the SMBusWriteByte command and
the 0x03 command byte for writing to the ports
on channel B. Enter the desired hexadecimal
data in the Dataout Edit field.
? When writing to an output ( 0x03 , 0x04 ) the data
corresponding to input bits are ignored and are
therefore “don’t care” bits.
The main window hexadecimal and binary combo boxes
can be used to convert between both number formats.
The general-purpose Two-Wire Interface Utility only
accepts and outputs a hexadecimal number format.
General Troubleshooting
Problem: Software reports it cannot find the board.
? Is the CMODUSB board power LED lit?
5) Install the MAX5946L evaluation software on your
computer by running the INSTALL.EXE program on
?
?
Is the USB communications cable connected?
Has Windows plug-and-play detected the board?
the CD-ROM disk. The program files are copied
and icons are created for them in the Windows Start
menu. Restart the computer when prompted. For
Windows 2000 or XP, you may need administrator
privileges.
6) Turn on the power supplies for the EV kit.
7) Start the MAX5946L program by opening its icon in
the Start menu.
8) Configure the MAX7313 I/O Expander for operation
as follows.
Bring up Control Panel->System->Device Manager,
and look at what device nodes are indicated for
USB. If there is an “unknown device” node attached
to the USB, delete it—this forces plug-and-play to
try again.
Problem: Unable to find DUT (device under test).
? Are the SCL and SDA signals pulled up to VDD? The
CMODUSB dip-switch SW1 enables the on-board
resistors on the CMODUSB interface board. There
must be pullup resistors somewhere on the bus.
Port configuration:
? Configure the MAX7313 ports to Inputs/Outputs
per Tables 5 and 6 above by using the
SMBusWriteByte command to write 0x33 data
to command bytes 0x06 and 0x07 .
?
If using jumper wires to connect, could the SCL and
SDA signals be swapped? Could the ground return
be missing?
8
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