VK202-25-E Matrix Orbital, VK202-25-E Datasheet - Page 39

• Manufacturer Part Number: VK202-25-E
• Description: VFD ALPHA/NUM DISPLAY 20X2
• Manufacturer: Matrix Orbital
• Series: VK202-25r

Specifications of VK202-25-E

• Outline L X W X H: 116.00mm x 37.00mm x 29.48mm
• Viewing Area: 89.75mm L x 11.50mm W
• Display Format: 20 x 2
• Display Type: Character
• Format: 5 x 7 Dots
• Voltage - Supply: *
• Character Size: 4.70mm H x 2.40mm W
• Interface: Serial
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Dots: -

connector. The keypad is scanned whenever a key is pressed;there is no continuous key scan. This means
that key presses are dealt with immediately without any appreciable latency. This also prevents electrical
noise which is often caused by continuous key scans.
9.1.1 I2C Interface
the first unread key press. A read is initiated by writing to the module with its base address plus 1, then
clocking the module’s return byte after the module releases the SDA line. Much more detail on this basic
I2C function can be found in the I2C specification by Phillips.
9.1.2 RS232 Interface
rate. This behavior can be modified using commands found in the next section.
9.2 Auto Transmit Key Presses On
9.3 Auto Transmit Key Presses Off
Matrix Orbital
The keypad is read by I2C master read. In short, this means that a read of the module will always return
By default on any press of a key, the module will immediately send out the key code at the selected baud
Syntax
Description
Remembered
Default
NOTE
case, the user will need to interpret the key codes differently. Also included are two extra
pins on each end of the connector to be used for ground strapping. This can be used in
conjunction with your keypad if a ground strap connection is required or if a common
ground connection is needed.
Please note that keypads may be laid out in a different pattern. If this is the
In this mode, all key presses are sent immediately to the host system
without the use of the poll keypad command. This is the default mode
on power up.
NOTE This command is not available in I2C.
Yes
On
Hexadecimal
Decimal
ASCII
0xFE 0x41
254 65
254 “A”
VK202-25
35