_______________________________________________________________________________________________________
3
device driver Maxim uses does not contain a digital
signature. This is not an error condition. It is safe to
proceed with the installation.
5) Verify that the EV kit’s LED1 is lit, indicating that the
USB is connected and providing power.
6) Start the EV kit software by clicking its icon in the
Windows
Start
menu.
7) The software automatically connects to the board
after a few seconds.
8) Click the
Initialize EV kit
button to write the power-
up command and configure default settings for
demonstration. This button writes to three registers:
Write(0x04 configuration) = 0xF8; Write(0x01
debounce) = 0x3F; and Write(0x03 interrupt) = 0x10.
9) On the EV kit board, press the buttons in the
KEY0–KEY55 matrix. Verify that the key scan codes
are reported in the software’s history window after 5
to 6 keypress events are queued, depending on the
debounce time and interrupt register settings. The
Evaluates: MAX7349/Emulates: MAX7347/MAX7348
MAX7349 Evaluation Kit
Table 1. Jumper Functions
JUMPER
SHUNT
LOCATION
FUNCTION
Pins 1 and 2*
AD0 = GND; I
2
C address 0x70 / 0x72
Pins 3 and 4
AD0 = SCL; I
2
C address 0x7C / 0x7E
Pins 5 and 6
AD0 = VDD; I
2
C address 0x74 / 0x76
JU1
Pins 7 and 8
AD0 = SDA; I
2
C address 0x78 / 0x7A
Pins 1 and 2*
Pizeo Sounder. P1 driven directly by SOUNDER output.
JU2
Pins 2 and 3
P i zeo S ound er . P 1 d r i ven thr oug h op ti onal acti ve fi l ter ci r cui t. Req ui r es i nstal l i ng U 6 and other com p onents.
Pins 1 and 2*
ALERT Input. Connected to VDD.
Pins 2 and 3
ALERT Input. Connected to GND.
JU3
No shunt
ALERT Input. Must be connected to an external drive signal.
Pins 1 and 2*
SDA. Connected to on-board I
2
C bus
JU4
No shunt
SDA. Must be connected to an external I
2
C bus.
Pins 1 and 2*
SCL. Connected to on-board I
2
C bus.
JU5
No shunt
SCL. Must be connected to an external I
2
C bus
Pins 1 and 2*
INT. Pulled up to on-board VDD supply.
Pins 2 and 3
INT. Pulled up to external INTVDD supply.
JU6
No shunt
Invalid Configuration. Do not use.
Not installed*
V
DDIO
= 2.5V from U3
JU7
PC board
trace cut open
V
DDIO
. Must be provided externally. 2.5V < V
DDIO
< 3.6V.
Not installed*
V
DD
= V
DDIO
JU8
PC board
trace cut open
V
DD
Power to MAX7349. Must be provided externally. V
DD
≤
V
DDIO
.
Pins 1 and 2*
SDA. Connected to on-board pullup resistor.
JU9
No shunt
SDA. Pullup resistor must be provided externally.
Pins 1 and 2*
SCL. Connected to on-board pullup resistor.
JU10
No shunt
SCL. Pullup resistor must be provided externally.
Not installed*
JTAG Power. Not connected to USB power.
JU11
Pins 1 and 2
JTAG Power. Connected to USB power.
*
Default configuration.