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MAX7359 Evaluation Kit
Figure 2. Using the LEDs as GPO Indicators
Using the LEDs as GPO Indicators
To configure the COL7/PORT7 pin as an open-drain
GPO, first change the key scan partition by changing
the value of the 0x02 Debounce / Port Enable register
to Output Ports GPO7 / Scan COL6 - COL0 . Next,
click its Write button. Finally, connect LED7 to the
COL7/PORT7 pin by installing a shunt at JU8. To drive
PORT7 low, illuminating the LED, set the value of the
0x04 Ports register so that the GPO7 checkbox is
unchecked, and click its Write button (Figure 2).
To configure additional COL/PORT pins as open-drain
GPOs, the procedure is similar. Write the 0x02
Debounce / Port Enable register to select how many of
the COL/PORT pins will be used for key scanning and
how many for output ports. Key scanning always uses
the lowest numbered COL/PORT pins. Set the JU3–JU8
jumpers to enable the LED outputs as needed. Write
the port data into the 0x04 Ports register (unchecked =
output low, checked = output undriven). Refer to the
MAX7359 IC data sheet for more information about the
ports register.
To configure the INT pin for use as a GPO pin, set both
the FIFO Level and Time combo box of register 0x03
Interrupt to Not Used , then click the Write button.
When configured for GPO, the INT pin is controlled
from the 0x04 Ports register (Figure 2).
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