Matrix-orbital LK202-25 Manual do Utilizador descarregar pdf (Página 16)

Keypad Header

Figure 16: Keypad Header

Table 10: Keypad Pinout

Function

Gnd

Column 1

Row 1

Column 2

Row 2

Column 3

Row 3

Column 4

Row 4

Column 5

Row 5

Gnd/Vcc*

To facilitate user input, the LK202-25/VK202-25 provides a Keypad Interface Connector which allows a

matrix style keypad of up to twenty-five keys to be directly connected to the display module. Key

presses are generated when a short is detected between a row and a column. When a key press is

generated, a character specific to that key press is automatically sent on the Tx communication line. If

the display module is running in I²C mode, the “Auto Transmit Keypress” function may be turned off to

allow the key presses to remain in the buffer so that they may be polled. The character that is

associated with each key press may also be altered using the “Assign Key Codes” command. The straight

twelve pin header of the Keypad Interface Connector will interface to a variety of different devices

including the Matrix Orbital KPP4x4 keypad.

*Note: The Ground / +5V pin is toggled by the jumper to the right of the keypad connector. Jump pads 1 & 2 for

+5V or 2 & 3 for GND.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 41 42

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Matrix-orbital LK202-25 Manual do Utilizador Página 16