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PDF GLK12232-25-WBL Data sheet ( Hoja de datos )
| Número de pieza | GLK12232-25-WBL | |
| Descripción | Technical Manual | |
| Fabricantes | Matrix Orbital | |
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GLK12232-25-WBL
Technical Manual
Revision: 2.0
1 page  
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1 Introduction
The GLK12232-25-WBL comes equipped with the following features;
• 122 x 32 pixel graphics display
• Text display using built in or user supplied fonts
• Adjustable contrast
• Backlighting
• Keypad interface
• RS-232 or I2C communications
1.1 What to Expect From the GLK12232-25-WBL
The GLK12232-25-WBL is designed as the display unit for an associated controller. The controller may
be anything from a single board, special purpose micro-controller to a PC, depending on the application.
This controller is responsible for what is displayed on the screen of the display.
The display provides a simple command structure to allow both text and graphics to be transferred to the
screen. Text fonts and graphics, if desired, are stored in the display’s flash ROM and may be regarded as
’permanent’ in that they survive power-off periods and don’t change until explicitly reprogrammed.
The screen is backlit for low-light situations. Backlighting may be turned on or off under program
control. Contrast is adjustable to compensate for differing lighting conditions and viewing angles.
1.2 What Not to Expect From the GLK12232-25-WBL
Since the display is intended to be used with a controller, it does not have any built in text editing
functions. If a stream of ASCII characters is inputed they will be displayed, but the CR, LF, backspace, etc.,
will be ignored. If the user’s application requires these functions, they must be provided by the software in
the user’s controller, which can issue the appropriate positioning commands to the display.
1.3 Keypad Interface
The keypad interface takes row / column input and converts it to ASCII characters, which are delivered
out the RS-232 or I2C port to the associated controller. Note that the keypad is not used to directly control
any aspect of the operation of the display, which acts simply as a matrix to serial converter. In order to use
the keypad to control the display, the user must program their controller accordingly.
1.4 mogd.exe
Matrix Orbital has developed an interface program which exercises all the features of the display. It
is also used to manage font and graphics downloads. The program, called "mogd.exe", is provided on the
Matrix Orbital Cd and website.
To install mogd.exe follow these steps;
Matrix Orbital
GLK12232-25-WBL
1
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Table 3: Connector Pinout
Pin 4
Ground
Pin 3 SDA (I2C data)
Pin 2 SCL (I2C clock)
Pin 1
Vdc
2.1.4 ACK
The idea of ACK is to indicate when the data has been received correctly. ACK does not indicate data
incorrectly received. ACK simply fails to indicate when data is correctly received. Clearly, this is of limited
usefulness and even less so with Matrix Orbital modules. Matrix orbital modules are not capable of failing
to acknowledge an incorrectly received byte in response to that byte’s transition. They are only capable of
failing to acknowledge the bytes following the byte, which weren’t received. To fully understand the reasons
for this one needs to understand something about how a Matrix Orbital module processes data. Basically the
reason why a Matrix Orbital module might fail to receive a byte correctly is that it was unable to process the
byte previous before the failed byte was transmitted. Because the module cannot possibly know that it would
be unable to store the byte before the next byte was received it cannot know to not ACK. The reason for this
situation in deference to situations one might be familiar with (i.e., memory chips, etc) is that the Matrix
Orbital module employs a micro-processor to perform these data storage functions. A memory chip takes
care of these things entirely within hardware subsystems which operate at the same speed as the transmission
themselves.
The display uses a standard Phillips 7bit address as defined by Phillips. However, Matrix Orbital specifies
I2C address in 8bits. The 8th bit, least significant bit (LSB or Low Order Bit) of the 8bit address is a read
/ write bit. If we take a standard Phillips 7bit address of 45hex this would be in binary; 1000101. This is
7bits. Matrix Orbital would describe the Phillips I2C address of 45hex as 8Ahex. The read address would
be 8Bhex.
For more information on Phillips I2C please visit;
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2.2 General Purpose Outputs
The display has two general purpose outputs, G1 and G2. These are provided to conthttp://www.atmel.com/dyn/resources/prod_d
relays or other electronic devices. This allows external devices to be turned on or off using the PC or con-
troller and software commands.
The two outputs differ slightly in specification;
• G1 provides an output which is switched LOW when ON. When G1 is OFF it is pulled up to +5V
through 150 kohms, in other words it can only be used to ’ground’ an external device. Maximum
current is 20 mA.
• G2 provides an output which is switched LOW when ON. When G2 is OFF it is pulled up to +5V,
supplied by the module. Maximum current is 20 mA.
Both outputs are referenced to ground.
Typical use of these outputs is shown in the Figure below.
Matrix Orbital
GLK12232-25-WBL
7
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