Command Summary
13
4.4
GLK Model
Keypad Header
Figure 14: Keypad Header
Table 10: Keypad Pinout
Pin Function Pin
Function
1
Gnd
7
Column 1
2
Row 1
8
Column 2
3
Row 2
9
Column 3
4
Row 3
10
Column 4
5
Row 4
11
Column 5
6
Row 5
12
Gnd/Vcc
*
To facilitate user input, the GLK24064-25 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 a synchronous
read method is desired in serial mode
*
, the “Auto Transmit Keypress”
function can 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:
In I
2
C mode, the “Auto Transmit Keypress” function should always be on, keypresses should not be polled.
**Note:
The 5V pin is toggled by the jumpers to the right of the keypad connector. Placing a 0 Ohm
resistor on jumper R31 ties pin 12 to Ground. Using a 0 Ohm resistor on jumper R29 su5V to pin 12. It
should be noted that only 1 jumper should be occupied at a time, otherwise a short will be created.
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