MIKROE-201 mikroElektronika, MIKROE-201 Datasheet - Page 3

• Manufacturer Part Number: MIKROE-201
• Description: Daughter Cards & OEM Boards SERIAL 7-SEG 4-DIGIT LED DISPLAY BOARD
• Manufacturer: mikroElektronika

Specifications of MIKROE-201

• Rohs: yes
• Product: Serial 7-seg LED Display Board
• Interface Type: SPI
• Operating Supply Voltage: 5 V
• For Use With: MCU

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Displaying digits is enabled by the time-division multiplexing. All the operations related to multiplexing and displaying digits are
performed by using the MAX7219 circuit provided on the additional board. The time-division multiplexing of a 7-segment display is
based on fast turning the display segments on/off in such a manner that one gets impression that all eight digits are active at the same
time. The MAX7219 circuit feeds digit segments with a signal via pins marked SEGxx, whereas pins marked DIGx are used to select
one of four displays to show the appropriate number.
Figure 4: Time-division multiplexing performed on the DIS3 display
In Figure 4, signals provided by the MAX7219 circuit causes segments of the DIS3 display to show number 5. When this display turns
off, the MAX7219 circuit sends a signal to the next display (DIS2), via the DIG2 pin, to show number 6. The same applies to digits
DIS1 and DIS0. When one cycle is complete, another one automatically starts, which results in successive changing of display digits
DIS3, DIS2, DIS1 and DIS0.
Figure 5: Principle of time-multiplexing performed on the DIS2 display
MikroElektronika