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MAX7359 Evaluation Kit
Detailed Description of
Hardware
The MAX7359 (U1) scans a matrix of keys
(KEY0–KEY63). The EV kit provides an 8 x 8 matrix of
keys. To demonstrate GPO capability, LED indicators
are jumper-selectable for COL2/PORT2–COL7/PORT7.
The FTDI FT232BL (U5) provides the USB engine. The
USB 5V power is regulated down to 2.5V by U2. LED8
indicates that USB 5V power is present.
Jumpers JU10 and JU11 optionally disconnect the
MAX7359 SCL/SDA, allowing the use of an external
user-provided I 2 C bus. Jumpers JU12 and JU13
optionally disable the on-board 1.5k Ω termination resis-
tors (R7 and R8), allowing the use of external user-pro-
vided I 2 C pullup resistors.
Table 1. Jumper Functions
The low-voltage RISC microcontroller, MAXQ2000 (U4),
processes commands sent by a program running on
the PC. Each particular EV kit has its own custom soft-
ware specific to that kit. The firmware loaded on this
board is identical to the MINIQUSB interface module.
Using an External I 2 C Bus Instead of USB
To disconnect from the on-board I 2 C bus, cut the links
at jumper locations JU10 and JU11. If the external I 2 C
bus already has appropriate pullup resistors, cut the
links at jumper locations JU12 and JU13. Leave the
USB connector (J1) unconnected. Move the JU2 shunt
to pins 2-3, and provide 2.5V to 3.6V power to the GND
and EXT V+ oval pads. Connect the external I 2 C bus to
the SCL and SDA test points of header H3.
JUMPER
JU1
JU2
JU3
JU4
JU5
JU6
JU7
JU8
SIGNAL
AD0
VCC
COL2/PORT2
COL3/PORT3
COL4/PORT4
COL5/PORT5
COL6/PORT6
COL7/PORT7
SHUNT POSITION
1-2*
3-4
5-6
7-8
1-2
2-3
1 only*
1-2
1 only*
1-2
1 only*
1 and 2
1 only*
1 and 2
1 only*
1 and 2
1 only*
1 and 2
EXPLANATION
AD0 = GND; I 2 C address 0x70 / 0x72
AD0 = SCL; I 2 C address 0x7C / 0x7E
AD0 = V CC ; I 2 C address 0x74 / 0x76
AD0 = SDA; I 2 C address 0x78 / 0x7A
U1 V CC = V DDIO (3.3V)
U1 V CC = external user-provided power
Use COL2 for key scan
Use PORT2 to drive LED2
Use COL3 for key scan
Use PORT3 to drive LED3
Use COL4 for key scan
Use PORT4 to drive LED4
Use COL5 for key scan
Use PORT5 to drive LED5
Use COL6 for key scan
Use PORT6 to drive LED6
Use COL7 for key scan
Use PORT7 to drive LED7
JU9
JU10
JU11
JU12
JU13
*Default position.
INT
SDA
SCL
SDA
SCL
Not installed* INT connected to MAXQ2000
PCB trace cut open INT connected to user-supplied microcontroller
Not installed* SDA connected to on-board I 2 C bus
PCB trace cut open SDA must be connected to an external I 2 C bus
Not installed* SCL connected to on-board I 2 C bus
PCB trace cut open SCL must be connected to an external I 2 C bus
Not installed* SDA connected to on-board pullup resistor
PCB trace cut open SDA pullup resistor must be provided externally
Not installed* SCL connected to on-board pullup resistor
PCB trace cut open SCL pullup resistor must be provided externally
6
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