MAX7219 is an integrated serial I / O common cathode display driver. It can be connected with microprocessor and 8-digit 7-segment digital LED display, bar graph display or 64 independent LEDs. It includes a B-type BCD encoder, multi-channel scanning circuit, segment driver, and an 8 * 8 static RAM to store every data. Only one external register is used to set the segment current of each LED.
A convenient four wire serial interface can connect all general microprocessors. Each data can be addressed without overwriting all displays when updating. MAX7219 also allows the user to choose whether to code or not for each data.
The device consists of a 150 μ a low-power off mode, analog and digital brightness control, a scan limit register that allows the user to display 1-8 bits of data, and a detection mode that makes all LEDs glow.
Only 3 IO ports are needed to drive 1 lattice! Dot matrix display without flicker! Support cascading!
Module parameters:
1. A single module can drive an 8 * 8 common cathode lattice
2. Module working voltage: 5V
3. Module size: length 6.5cm x width 6.4cm x height 1.3cm
4. With 32 fixing screw holes, the hole diameter is 3mm
5. The module has I / O interface and supports multiple modules cascading
1. The left side of the module is the input port and the right side is the output port.
2. When controlling a single module, only connect the input port to the CPU
3. When multiple modules are cascaded, the input of the first module is connected to the CPU, the output is connected to the input of the second module, the output of the second module is connected to the input of the third module, and so on
Take 51 single chip microcomputer as an example:
VCC to 5V
GND to GND
DIN to P2.2
CS to P2.1
CLK to P2.0
Package:
1. MAX7219 2 * 2 lattice module
2.20cm DuPont line 5P
3. Needle arrangement 2.54-5p
