MAX7219 digital display control module
MAX7219 is an integrated serial input / output common-cathode display driver, it connects the micro cessor 7-segment digital LED display with 8 digits, you can also connect a bar graph display or 64 independent LED. Thereon including a B-type BCD encoder chip, multi-channel scanning loop segment word driver, but also a static RAM 8 * 8 for storing each data. Only one external register is used to set the segment current of each LED.
A convenient four-wire serial interface can be connected to all general-purpose micro cessor. Each data can be addressed in the update do not need to rewrite all of the display. MAX7219 also allows each user to select a data coding or non-coding.
The entire apparatus 150A includes a low-power shutdown mode, analog and digital brightness control, a scan-limit register allows the user to display data bits 1-8, and one for all LED luminescence detection mode.
Only three IO ports to drive eight digital tube! Digital flicker- display! Support cascading! Display as shown below:
Between the digital and the PCB hole spacing 2.54mm pin connection, you can easily replace the digital tube!
Zhang again rear view:
PCB board four corners fixed with copper studs, which can effectively prevent a short circuit accidents from happening!
Digital tube 0.36 inches four one common cathode LED
This module is compatible with 5V / 3.3V microcontroller (51 / AVR / STM32 .......)
Wiring instructions ( gram to vide an example, you can access any IO port, modify the port can be defined in the gram):
1.VCC and GND Do not reversed, so as not to burn chips
2.51 MCU P0 port need pull-up resistors, if your device does not have pull-up resistor can be connected to other ports data lines
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