MAX6964EVKIT Maxim Integrated, MAX6964EVKIT Datasheet - Page 7

• Manufacturer Part Number: MAX6964EVKIT
• Description: LED Lighting Development Tools Evaluation Kit for the MAX6964
• Manufacturer: Maxim Integrated
• Series: MAX6964r

Specifications of MAX6964EVKIT

• Product: Evaluation Kits

The general-purpose 2-wire interface utility can also
be used to communicate with the MAX6964, and thus,
control or read back signals from the MAX6964. Use
the View | Interface pulldown menu to access the utility.
The utility configures the 2-wire serial-interface para-
meters, such as start and stop bits, acknowledge-
ments, and clock timing. The 2-wire interface screen
allows you to send general-purpose 2-wire commands
using the SMBusWriteByte and SMBusReadByte. The
interface utility only accepts and outputs hexadecimal
number 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
command, and then retransmits the device address
and reads one byte of data.
For information on the differences between a 2-wire and an
SMBus™ interface, read Application Note 476: Comparing
the I
SMBus is a trademark of Intel Corp.
Figure 3. The 2-Wire Interface Window Provides Direct, Low-Level Access to the MAX6964 and 2-Wire Serial Interface
2
C Bus to the SMBus at www.maxim-ic.com.
MAX6964 Evaluation Kit/Evaluation System
General-Purpose 2-Wire Interface Utility
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Problem: Software reports it cannot find the inter-
face board.
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Problem: Unable to find U1.
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Is the interface board power LED lit?
Is the USB communications cable connected?
Has Windows plug-and-play detected the board?
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 process forces plug-and-
play to try again.
Is power applied to the MAX6964 EV kit VIN PCB
pad or is jumper JU1 configured to pins 2 and 3 to
receive power from the CMAXQUSB interface
board? This is required for powering U1.
Are the SCL and SDA signals pulled up to VDD?
The CMAXQUSB interface board dipswitch SW1
enables the on-board resistors on the interface
board. There must be pullup resistors somewhere
for the 2-wire SCL and SDA signals.
If using jumper wires to connect, are the SCL and
SDA signals swapped? Is the ground return missing?
General Troubleshooting
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