MAX7219 is an integrated serial input / output common-cathode display drivers, which connects the microprocessor 7-segment numeric LED display with eight digits, you can also connect a bar graph displays or 64 independent LED. Including B-type on a BCD encoder chip, multi-channel scanning loop, segment word driver, but also an 8 * 8 static RAM for storing each data. Only one external register is used to set the segment current for each LED.
A convenient four-wire serial interface can connect all general-purpose microprocessor. Each data can be addressed at the time of the update does not need to rewrite all of the display. MAX7219 also allows the user to select data for each coding or not coding.
150μA entire device contains a low-power shutdown mode, analog and digital brightness control, a scan-limit register allows the user to display the 1-8 bit data, there is an all LED light detection mode.
Need only three IO ports to drive a dot! When the dot matrix display flicker-free! Supports cascading!
Module parameters:
1. A single module can drive a 8x8 dot matrix common cathode
2. Module Operating voltage: 5V
3. Module dimensions: length 5 cm X 3.2 cm wide and 1.5 cm high X
4. With 4 fixing screws holes with a diameter 3mm, can be fixed by using our copper pillars M3
5. module with input and output interfaces, support for cascading multiple modules
Wiring instructions:
1. The left side of the module to the input port, the right to an output port.
2. When the control of a single module, simply input port connected to CPU
3. When a plurality of cascaded modules, input and output termination CPU, the input terminal of the second output termination modules of a module, the first two modules of the input terminal of the three termination modules, and so on. ..
51 microcontrollers, for example:
VCC → 5V
GND → GND
DIN → P22
CS → P21
CLK → P20
