VK202-25-VPT Matrix Orbital, VK202-25-VPT Datasheet - Page 20

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VK202-25-VPT

Manufacturer Part Number
VK202-25-VPT
Description
VFD ALPHA/NUM DISPLAY 20X2
Manufacturer
Matrix Orbital
Series
VK202-25r
Datasheet

Specifications of VK202-25-VPT

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
9 V ~ 35 V
Character Size
4.70mm H x 2.40mm W
Interface
Serial
Operating Temperature
-20°C ~ 70°C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of Dots
-
3.3 The display module is communicating, however text cannot
4 Communications
4.1 Introduction
port.
4.1.1 I
single I
Select Jumpers as can be seen in Section 2.3 and ensure that pull up resistors, with a nominal value of 1K
to 10K, are placed on the SCL and SDA communication lines coming from pins two and three of the Data /
Power Connector respectively. These pins are shared with RS232 and must be switched to I2C if this is how
the host will be communicating with the display. Data responses by the module are automatically output
via RS232, in case the host will be querying the module, it is necessary for the host to inform the module
that its responses are to be output via I2C. This can be done by sending command 254 /160 / 0 to turn off
auto transmission of data in RS232. This will keep the data in the buffer until the master clocks a read of
the slave. The I2C data lines operate at 5V. The VK202-25 uses 8-bit addressing, with the 8th or Least
Significant Bit (LSB) bit designated as the read/write bit, a 0 designates a write address and a 1 designates a
read address. The default read address of the display module will be 0x51, whereas the write address is 0x50
by default. This address may be changed by using cmd 254 / 51 / <address>. The VK202-25should only be
sent addresses that are even (LSB is 0). When the I2C master wishes to write to the display, the effective
address is $50 (0101 0000) , since the LSB has to be 0 for an I2C master write. When the I2C master wishes
to read the VK202-25, the effective address is $51 (0101 0001), since the LSB has to be 1 for an I2C master
read.
this Phillips I2C address as $8A (1000 1010). The read address would be $8B (1000 1011).
Matrix Orbital
The commands listed in this chapter describe how to configure data flow on the RS232/TTL and I
The VK202-25 is capable of communicating at 100 Kbps in I
If we take a standard Phillips 7 bit address of $45 (100 0101), Matrix Orbital’s VK202-25 would describe
The unit does not respond to general call address ($00).
When communicating in I
Finally, you may reset the display to it’s default settings using the Manual Override Jumper, see
Section 2.6 on page 13.
A common cause may be that the brightness settings have been set to low. The solution to this problem
is to increase the brightness.
2
be displayed.
NOTE I
C communication line. However, in order to communicate via I
2
C Communication Summary
2
C communication will always require pull up resistors.
2
C the VK202-25 will send an ACK on the 9th clock cycle when addressed.
VK202-25
2
C mode, with 127 units addressable on a
2
C you must first set the Protocol
2
16
C

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