Terasic Cypress CapSense P0080, Руководство пользователя

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Chapter 3
Using the CapSense Matrix Button
Keypad
This section describes the detailed information of the components and connectors of the CapSense
Matrix Button Keypad board.
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3 .1
3 .1
U se r I nput /Out put
U se r I nput /Out put
The user input/output provide a versatile and reliable drop-in replacement for mechanical matrix
solutions using an output truth table described later. For demonstration purposes, these pins are
connected to LEDs.
•
LEDs
The CapSense Matrix Solution board consists of 16 red LEDs above the 4 x 4 Matrix CapSense
touch buttons for user feedback. The 16 red LEDs are organized in a 4 x 4 matrix. Multiplexing is
used to reduce the number of pins needed to drive an LED. The 16 red LED is split into 4 rows and
4 columns which allow you drive it using 4 row outputs and 4 column outputs.
Figure 3-1 shows its
arrangement.