Datasheet

MAX9268 Evaluation Kit
Evaluates: MAX9268
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12) Start the MAX9249 EV kit software by opening its
icon in the Windows Start | Programs menu. The
EV kit software configuration window appears, as
shown in Figure 7.
13) Press the Connect button and the configuration
window disappears.
14) The EV kit software main window appears, as shown
in Figure 1.
15) Press the Read All button to read all registers on the
MAX9249 and MAX9268.
16) I
2
C Slave Device Demo: Make sure MAX9268 EV kit
headers JU151–JU154 are in the 1-2 position.
17) In the software’s MAX7324 tab (Figure 4), press
the Search for MAX7324 button. Verify that the
MAX7324 Device Address drop-down list shows
0xDA (JU151=1-2 JU152=1-2).
18) Press the LED151-LED158 ON button. Verify that
MAX9268 EV kit LED151–LED158 turn on.
19) Press the LEDs Alternating button. Verify that
MAX9268 EV kit LED151, LED153, LED156, and
LED158 turn off.
20) GPIO Demo: In the software’s MAX9268 tab
(Figure 3), scroll down to Register 0x06. Uncheck
the GPIO1OUT checkbox and press the Write but-
ton. Verify that MAX9268 EV kit LED4 turns off.
21) Uncheck the GPIO0OUT checkbox and press the
Write button. Verify that MAX9268 EV kit LED3 turns
off.
22) Check the GPIO1OUT checkbox and press the Write
button. Verify that MAX9268 EV kit LED4 turns on.
23) Check the GPIO0OUT checkbox and press the Write
button. Verify that MAX9268 EV kit LED3 turns on.
24) INT Demo: Toggle MAX9268 EV kit switch SW2 up.
Verify that MAX9249 EV kit LED1 turns on, indicating
that MAX9268 INT input is asserted.
25) In the software’s MAX9268 tab, scroll to
Register 0x06 and press the Read button. Verify
that the INT checkbox is checked, indicating that
MAX9268 INT input is asserted.
26) Toggle MAX9268 EV kit switch SW2 down. Verify
that MAX9249 EV kit LED1 turns off, indicating that
MAX9268 INT input is not asserted.
27) In the software’s MAX9268 tab, scroll to
Register 0x06 and press the Read button. Verify
that the INT checkbox is not checked, indicating
that MAX9268 INT input is not asserted.
Detailed Description of Software
The main window of the evaluation software (Figure 1)
shows a block diagram representing the MAX9249/
MAX9268 system. The left column shows MAX9249 input
data sources, and the right column shows MAX9268
output data sinks.
The Change Configuration button (Figure 1) brings
up the Configuration window (Figure 7), allowing the
software GUI to select into which side of the link the
USB cable should be plugged. Controlling from the
MAX9268 side requires changing some jumper set-
tings as described in this window. If the MAX9249
and MAX9268 device addresses have been previously
changed from their factory power-on-reset values, the
new addresses must be specified in the Configuration
window to allow register access.
The Baud Rate drop-down list sets the communications
baud rate. The USB link uses the same baud rate as the
MAX9249/MAX9268. Note that the baud rate should only
be changed one step at a time.
The Read All button reads all the MAX9249 and
MAX9268 device registers. Reset to Default Values
restores recommended factory settings, and Write All
writes all MAX9249/MAX9268 device registers with the
values shown in the GUI.
The MAX9249 tab sheet (Figure 2) provides direct access
to all registers of the MAX9249, and the MAX9268 tab
sheet (Figure 3) provides direct access to all registers of
the MAX9268. Each register has its own Read and Write
button. The small circle next to the Read button turns yel-
low to indicate an attempt to read or write, red to indicate
a failed read or write, and green to indicate a successful
read or write operation.
The MAX7324 tab sheet (Figure 4) controls the I
2
C I/O
expander on the remote side of the link. When the USB
is plugged into the MAX9249 EV kit, the MAX7324 tab
sheet controls the MAX7324 (U15) on the MAX9268
EV kit. Note that the MAX7324 actually has two device
addresses; for simplicity, the software GUI only displays
the device address associated with MAX7324 outputs.
For details, refer to the MAX7324 IC data sheet.
The PRBS Test tab sheet (Figure 5) uses the MAX9268
registers to perform a pseudorandom bit sequence
(PRBS) error-rate test. Select the test duration (maxi-
mum 32,767sec = 9.1hrs) and press the Start button.
The software GUI configures the MAX9268 to begin the
PRBS test, counts down the specified delay time, and
then reports the final value of the MAX9268 PRBSERR
register.