SPECIFICATIONS

The MAX7219 is an integrated serial input/output common cathode display driver that connects a microprocessor to an 8-bit, 7-segment digital LED display, a bar line display, or 64 individual leds. It includes an on-chip B-type BCD encoder, a multiscan loop, a segment word driver, and an 8 × 8 static RAM to store each piece of data. Only one external register is used to set the segment current of each LED. A convenient four-wire serial interface connects all general-purpose microprocessors. Each data can be addressed at update time without rewriting all of the display. The MAX7219 also allows users to choose to encode or not encode each piece of data.

The entire device includes a 150μA low-power off mode, analog and digital brightness control, a scan limit register that allows users 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! No flicker when dot matrix display! Support cascading! Module parameters: 1. A single module can drive an 8*8 common cathode lattice 2. Module operating voltage: 5V3. Module dimensions: Length 26.5 cm X width 6.4 cm X height 1.3 cm 4. 64 fixing screw holes with a diameter of 3mm5. The module has input and output ports and supports multiple module expansion cables. 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 the input port needs to be connected to the CPU3. When multiple modules are cascaded, the input end of a module is connected to the CPU, the output end is connected to the input end of the second module, the output end of the second module is connected to the input end of the third module, and so on... Take 51 MCU as an example: VCC → 5VGND → GNDDIN → P2.2CS → P2.1CLK → P2.0

One bit 7219 lattice module parameters:

1. A single module can drive an 8*8 common cathode lattice

2. Module operating voltage: 5V

3. Module size: length 3.2cm X width 3.2cm X height 1.3cm

4. With 4 fixing screw holes, aperture 3mm

5. The module has input and output ports and supports the cascading of multiple modules

Two-position 7219 lattice module parameters:

1. A single module can drive an 8*8 common cathode lattice

2. Module operating voltage: 5V

3. Module size: Length 6.5cm X width 3.2cm X height 1.3cm

4. With 8 fixing screw holes, aperture 3mm

5. The module has input and output ports and supports the cascading of multiple modules

Four-bit 7219 lattice module parameters:

1. A single module can drive an 8*8 common cathode lattice

2. Module operating voltage: 5V

3. Module size: Length 6.5cm X width 6.4cm X height 1.3cm

4. With 32 fixing screw holes, aperture 3mm

5. The module has input and output ports and supports the cascading of multiple modules

Eight-bit 7219 lattice module parameters:

1. A single module can drive an 8*8 common cathode lattice

2. Module operating voltage: 5V

3. Module size: length 3.2cm X width 3.2cm X height 1.3cm

4. With 4 fixing screw holes, aperture 3mm

5. The module has input and output ports and supports the cascading of multiple modules

Wiring instructions:

1. The left side of the module is the input port, and the right side is the output port.

2. To control a module, connect the input port to the CPU

3. When multiple modules are cascaded, the input end of one module is connected to the CPU, the output end is connected to the input end of the second module, the output end of the second module is connected to the input end of the third module, and so on...

Take 51 single chip microcomputer as an example:

VCC  →  5V

GND  →  GND

DIN → P2.2

CS → P2.1

CLK → P2.0

(Note: Round hole row pin is welded, wiring row pin is not welded)