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CMAXQUSB User’s Guide
Connector P7: SMBus/I 2 C Test Points
For convenience, the SMBus/I 2 C interface signals are
connected to labeled pins on header P7. See Table 5.
Table 5. Connector P7 Description
Detailed Description of Firmware
The CMAXQUSB firmware was developed using
the MAX-IDE assembly language development
environment. Full source code is available at
www.maxim-ic.com/tools/evkit under the project
P7 PIN
1
2
3
4
LABEL
VDD
SDA
GND
SCL
FUNCTION
VDD Power Supply
SMBus/I 2 C SDA (Data)
Ground Return
SMBus/I 2 C SCL (Clock)
name CMAXQUSB Firmware .
If designing a custom EV kit board requiring an inter-
rupt service routine in custom firmware, GPIO signals
K5–K8 are the suggested locations for the interrupt sig-
nal. The standard CMAXQUSB firmware does not ser-
vice interrupts on any GPIO pins.
Connector P8: SPI Test Points
For convenience, the SPI interface signals are connect-
ed to labeled pins on header P8. See Table 6.
Table 6. Connector P8 Description
Troubleshooting
Problem: Software reports it cannot find the board.
? Verify that the CMAXQUSB power LED is lit.
? Verify that the USB cable is connected.
? Verify that Windows plug-and-play detected the
P8 PIN
1
2
3
4
5
6
LABEL
VDD
MISO
MOSI
SCLK
CS
GND
FUNCTION
VDD Power Supply
Master-In, Slave-Out Data
Master-Out, Slave-In Data
SPI Clock
Chip Select. Configurable active
high or active low.
Ground Return
board. Bring up Control Panel -> System -> Device
Manager, and look at what device nodes are indicat-
ed for the 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 SMBus/I 2 C device.
? Verify that the SCL and SDA signals are pulled up to
VDD. CMAXQUSB DIP switch SW1 enables the on-
board resistors. There must be pullup resistors
somewhere on the bus.
? If using wires to connect the CMAXQUSB to your
target board, make certain that you have not
swapped the SCL and SDA signals. Verify that the
ground return is connected.
7
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