The MAX7219 is an integrated serial input / output common-cathode display driver, it is connected to a microprocessor with 8digit 7segment digital LED display can also be connected to the bar graph display or 64 separate LED. On B BCD encoder including an on chip, multi channel scanning loop word drive, but also an 8 x 8 static RAM is used to store each data. Only one external register is used to set the current of each LED segment.
The module left as an input port to the output port on the right.
The control of a single module, simply input port to the CPU.
Module Operating voltage: 5V.
Module size: 5 cm long X 3.2 cm wide X 1.5 cm high.
With 4 fixed screw holes for easy installation.
Multiple modules cascade input termination CPU, 2 output termination module, a module of the input of the input terminal, the output terminal of the first two modules of the first three modules, and so on ...
VCC → 5V
GND → GND
DIN → P22
CS → P21
CLK → P20
VCC and GND is not reversed, it would burn the chip!
When the 51 microcontroller P0 port control, must be connected to the pull-up resistor, it is recommended that the resistance of 4.7K--10K.
Please lattice into the hole first seat, and then inserted into the round hole Block PCB board welding. Lattice word side facing the surface order from left to right pin 123456. PCB board 1 foot square pad.
Electrolytic capacitors long-legged as positive, negative short legs; ceramic capacitor without the positive and negative points.
Package content: 2 x MAX7219 Dot Matrix Module