CMAXQUSB+ Maxim Integrated Products, CMAXQUSB+ Datasheet - Page 7

• Manufacturer Part Number: CMAXQUSB+
• Description: MODULE COMMAND SMBUS/I2C
• Manufacturer: Maxim Integrated Products

Specifications of CMAXQUSB+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

For convenience, the SMBus/I
connected to labeled pins on header P7. See Table 5.
Table 5. Connector P7 Description
For convenience, the SPI interface signals are connect-
ed to labeled pins on header P8. See Table 6.
Table 6. Connector P8 Description
P7 PIN
P8 PIN
1
2
3
4
1
2
3
4
5
6
Connector P7: SMBus/I
LABEL
LABEL
MISO
MOSI
SCLK
GND
Connector P8: SPI Test Points
GND
VDD
SDA
VDD
SCL
CS
_______________________________________________________________________________________
Chip Select. Configurable active
high or active low.
VDD Power Supply
SMBus/I
Ground Return
SMBus/I
FUNCTION
VDD Power Supply
Master-In, Slave-Out Data
Master-Out, Slave-In Data
SPI Clock
Ground Return
2
C interface signals are
2
2
C SDA (Data)
C SCL (Clock)
FUNCTION
2
C Test Points
CMAXQUSB User’s Guide
The CMAXQUSB firmware was developed using
the MAX-IDE assembly language development
e n v i r o n m e n t . F u l l s o u r c e c o d e i s a v a i l a b l e a t
www.maxim-ic.com/tools/evkit
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.
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
Problem: Unable to find SMBus/I
• Verify that the SCL and SDA signals are pulled up to
• If using wires to connect the CMAXQUSB to your
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.
VDD. CMAXQUSB DIP switch SW1 enables the on-
board resistors. There must be pullup resistors
somewhere on the bus.
target board, make certain that you have not
swapped the SCL and SDA signals. Verify that the
ground return is connected.
Detailed Description of Firmware
Troubleshooting
2
C device.
under the project
7