LK204-25-USB-WB Matrix Orbital, LK204-25-USB-WB Datasheet - Page 19

• Manufacturer Part Number: LK204-25-USB-WB
• Description: LCD Character Display Modules Blue Background White Text
• Manufacturer: Matrix Orbital
• Series: LK204-25r

Specifications of LK204-25-USB-WB

• Character Count X Line: 20 x 4
• Module Size (w X H X T): 98 mm x 60 mm x 27.5 mm
• Fluid Type: STN
• Voltage Rating: 5 V
• Operating Temperature Range: 0 C to + 50 C
• Display Mode: Transmissive
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Keypad Header
To facilitate user input, the LVK204-25 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:
+5V or 2 & 3 for GND.
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The Ground / +5V pin is toggled by the jumper to the right of the keypad connector. Jump pads 1 & 2 for
Figure 20: Keypad Header
Table 15: Keypad Pinout
Pin
10
11
12
1
2
3
4
5
6
7
8
9
Gnd/Vcc*
Column 1
Column 2
Column 3
Column 4
Column 5
Function
Row 1
Row 2
Row 3
Row 4
Row 5
Gnd