Our products are targeted to designers of various custom designed LED display panels using large amount of LEDs and indicators including different type and size indicators in same project. Some of applications are building machinery operator panel screens, mixed sign indicators panels, indoor - outdoor LED displays, medical instruments LED displays, exchange board LED displays, timetable schedule boards, transport information systems, production information LED displays and etc. Comprehensive and simple process of developing of specific projects gives ability for very fast time to market and reduces cost of developing and production process. In PRODUCTS page are enclosed variety of free schematics of seven, fourteen - sixteen segment, LED Bargraph Displays, dot matrix LED Displays, single LED and bicolor LED Displays. Also in site is enclosed electronic projects, descriptions, source files,

documentation, and projects with serial shift register using 74HCT595, TPIC6B595 and Darlington buffers ULN 2803.


16 SEGMENT LED DISPLAYS	14 SEGMENT LED DISPLAYS	7 SEGMENT LED DISPLAYS	BARGRAPH LED DISPLAYS

LED DISPLAY DESIGN PROCESS

Process of developing of specific LED display is concentrated mainly in the next few steps:

o	Choosing suitable LEDs and Indicators involved in project
o	Tracing PCB boards
o	Assembling PCB boards
o	Testing
o	Software developing and debugging
o	Production

LED CONTROLLERS

DCA2X16 and MCA2X16 are fully integrated and cheap LED controllers designed for driving all kind of Common Anode LED displays and single LED's. These products are very easy to use, simple and flexible in design, providing low count of cables, low consumption, low cost, light weight and small in dimensions. These series of LED controllers are suitable for wide range of applications. LED controllers provides all refresh cycles and logic operations, Light Intensity Control (Global Intensity) using programmable PWM control, Power Supply for logic, Power Anode Drivers and Serial Channel Buffers - LED drivers. Both LED controllers drive two independent LINES. Refresh rate is 100 Hz and provide excellent, free flicker views of the designed LED display. Duty cycle of refresh is 1 to 10, providing maximal possible light intensity for driving dynamic LED displays. Simple and cheap external serial driver blocks - LED drivers, provides high current for driving LEDs and low count of cables and interconnections between PCB boards, low power consumption and heat losses of the custom designed LED displays. Internal Download - Upload Character generator takes ability of the user to dump directly decimal and hexadecimal values for 7 segment displays and ASCII characters and strings for 14 -16 segment indicators without one byte additional software. LED controllers provides additional useful information about level of Power supply voltage (VIN), logic supply voltage (VCC) and room illuminati value for optimal PWM adjusting. LED controllers accepts two types of data HEXADECIMAL and ASCII strings and characters. First type is decimal-hexadecimal bytes and blocks for transmitting commands and driving seven segment displays. Second type of data is ASCII characters and strings for driving 14 -16 alphanumeric segment indicators. After the command is completed, LED controller sends to HOST message (selectable as LITERAL or HEX) for result of operation and indicate that is ready to accept new command. When the answer is not required, user must refer to the specific period for command execution. Simple and low count of command set is very easy to learn and use. Used method of “HIDEN WRITE and REFRESH “prevents from flicker effect of the LED display and loss of refresh cycles. User can read and write data in any address in any time in LED buffer using commands No 4, 5, 6, 7 in selected LINE. By this way can be designed variety of graphic symbols and pictures to the LED display.

DCA2X16 LED controller

DCA2X16 LED display controller

DCA2X16 LED controller receive all commands via standard serial RS232C channel that takes flexibility to connect DCA2X16 to all terminals and Personal computers, that support standard RS232C serial channel. Command protocol is very simple to use, and can be easy implemented in any kind of Hi level Programming languages and Assemblers. DCA2X16 supports four different baud rates DIP switch selectable. Internal upload - download character generator takes ability to construct any kind of large LED displays without any additional software, only using digit and character pointers for each LINE to control seven segment and 14 -16 segment indicators.

MCA2X16 LED controller

MCA2X16 is multifunctional LED Display Controller, very similar like DCA2X16 but supports four types of interfaces using wedge type interface boards depending of specific application. This interface boards dramatically expand connection flexibility and amount of driven LED's. As example when is used CB485 interface board can be connected to single serial channel up to 32 Slave LED controllers MCA2X16 that can drive total amount of 81920 single LED's. Each type of interface board is recognizing automatically from LED controller and initialize peripherals requirements. MCA2X16 uses same command set like DCA2X16 including one extra command for Slave select (applicable only with CB485 board).

MCA2X16 LED display controller

CB232 Interface board

CB232 interface board provides point to point connection with user systems, that maintain standard RS232C serial channel. This interface board uses tree wire cable that can be long up to 30 meters between MCA2X16 LED controller and HOST system. Cable Connectors are standard DB9 female connectors. Used signals are Transmit, Receive and Ground. Other signal is not connected.

CB203 Interface board

CB203 interface board provides point to point connection with user systems, that maintain standard TTL level serial channel. This interface board is very suitable for direct connection with microcontrollers and microprocessor boards without additional buffering. Signals are internally buffered (to the LED controller's side) and can be used tree wire cable that can be long up to few meters. Connectors are Cvilux tree pin HU3 crimp cable connectors.

CB100 Wireless Interface board

CB100 is point to point connection between LED controller and user system, that uses unlicensed Bluetooth module Class 1 that covers range of 100 meters in open air . Connection is consist from two main parts. First one is Bluetooth dongle that is attached to one of the USB channels in user system (normally PC computer) and second one is CB100 interface board, attached to the wedge connector of MCA2X16 LED controller. This type of interface replace wires in systems, where is complicated or impossible cable wiring.

CB485 Slave Interface board

CB485 is full duplex multipoint four wire RS485 standard interface board. Via selecting Slave address DIP switch user can connect up to 32 pieces MCA2X16 LED controllers to single serial channel to HOST system. Easy end cheap crimp cable connections takes ability to build very large LED displays without efforts. CB485 supports optional jumpers for line termination. For more detailed information, documentation and source files about all types of interface board available for MCA2X16 LED controller, refer to page PRODUCTS.

CM485 Master board

CM485 - Master board is full duplex multi point four wire RS485 Master board. Via single standard RS232C channel can be controlled up to 32 Slave LED Controllers MCA2X16, equipped with CB485 Slave Interface board. Slave select is performed via command that is set internal bit (in selected LED Controller) and enable transmitting of the RS485 buffer. Via using CM485 Master board and CB485 Slave board, LED Controller's capability is expanded to control in one loop up to 81920 single LED's. Schematic below shows wiring and interconnection diagram. For more detailed information and downloads refer to PRODUCTS page.

KEY FUTURES OF DCA2X16 and MCA2X16 LED CONTROLLERS

Type of Indicators	both LINES	each LINE
seven segment indicators	320	160
fourteen - sixteen segment indicators	160	80
dot matrix 5X8	64	32
single LEDs	2560	1280

ADDITIONAL FUTURES

o	Test communication between HOST and LED controller
o	One command for clear and test of all displays indicators
o	99 steps PWM for LED Intensity Control
o	Measuring input voltage (VIN)
o	Measuring logic supply voltage (VCC)
o	Measuring room environment Illuminati (optional)

TECHNICAL DATA

Supply Voltage	min 8V – max 15V
Anode Current	3A for each Anode for both LINES
Power Consumption ( +5V )	40 mA max both full LINES
Accuracy of Measurement of VIN	+/- 0.1 V
Accuracy of Measurement of VCC	+/- 0.1 V
Luminosity measurement	10 bit
Duty Cycle	1 / 10
Refresh Rate	100 Hz
PWM depth 99 steps	0 – 99 %
Shift Register Clock	375 kHz each LINE
Number of Driven Lines	2
Number of LED Buffers	2 X 160 bytes
Number of LED drivers each LINE	16
Max number of LED drivers both LINES	32
Number of Commands	19
Dimensions inches	3.3 in. X 2.2in.
Dimensions millimeters	83.82 mm X 55.88 mm
Weight	30 grams

LED DISPLAY DRIVERS

Selecting of LED drivers buffer depends on the desired load current for selected indicators. This technique enables ability of connection of different types of indicators in each LINE to the same LED driver. Current for desired LED display can be easily provided depending value of Input Voltage (VIN) and Technical Data about Forward current for selected LED indicator using formula and examples in extbuf3.8.pdf. Actually each LINE is constructed from up to 16 serially connected 8 bit shift registers - LED drivers. Anodes of indicators are directly connected to appropriate pins to Anode connector. For more detailed information and downloads refer to PRODUCTS page.