Datasheet

MAX9268 Evaluation Kit
Evaluates: MAX9268
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The firmware also supports a small set of commands,
available when RTS is clear. Since all register read/
write requests are sent with RTS set, there is no conflict
between register data and firmware commands. These
firmware commands are issued automatically by the
MAX9249 EV kit software GUI. The following information
is provided for reference only.
Firmware command “?” prints the firmware version ban-
ner message and brief command list.
Firmware command “B” changes the baud rate by
changing the internal TH1 baud-rate divisor. Refer to
firmware help command “?” for details. Pressing switch
SW122 resets the USB baud rate to 921,600 baud. The
software GUI automatically sends the baud-rate change
command.
Firmware command “T” supports waking up the MAX9249
from the MAX9268 side of the link. Command “T” per-
forms a dummy read, followed by a delay on the order
of 1ms to 8ms, and finally writes a register value. For
example, send “T810558800483” to read from device
address 0x81 register 0x05, delay 4ms, then write to
device address 0x80 register 0x04 data 0x83. This is
the MAX9249 wake-up sequence for the default device
addresses. The software GUI automatically sends this
command when the Wake Up MAX9249 button is
pressed.
Table 1. MAX9268 EV Kit Jumper Descriptions
JUMPER SIGNAL SHUNT POSITION DESCRIPTION
JU1 CDS
1-2
CDS = high; ECU attached to MAX9268; connects the USB to the
MAX9268 EV kit
2-3* CDS = low; optional peripheral attached to the MAX9268
Open Reserved
SW1 MS
1-2
(toggle switch up)
MS = high; full-duplex bypass mode; device registers not
accessible
2-3*
(toggle switch down)
MS = low; half-duplex base mode; required when writing to device
registers or when using external I
2
C peripheral
JU2 BWS
1-2* BWS = high
2-3 BWS = low
JU3 EQS
1-2* EQS = high
2-3 EQS = low
JU4 DRS
1-2* DRS = high
2-3 DRS = low
JU5 SSEN
1-2* SSEN = high
2-3 SSEN = low
JU6
PWDN
1-2*
PWDN = high
2-3
PWDN = low
JU7 ADD1
1-2 ADD1 = IOVDD (see Table 2)
1-3 ADD1 = Open (see Table 2)
1-4* ADD1 = GND (see Table 2)
JU8 ADD0
1-2 ADD0 = IOVDD (see Table 2)
1-3 ADD0 = Open (see Table 2)
1-4* ADD0 = GND (see Table 2)
JU9 Bus power
1-2* J1 pin 4 connects to VIN
2-3 J1 pin 4 connects to GND
Open J1 pin 4 unconnected
JU10 Bus power
1-2* J1 pin 1 connects to USB+5V
Open USB power is not connected to link cable power