MAX9268 Evaluation Kit

_______________________________________________________________________________________ 5

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.

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.

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.