Seven-Segment-LED with SPI

Seven-Segment-LED with SPI


LED7 is a 4-digit 7-segment display with Serial-Peripheral-Interface, short SPI. The hardware consists of four shift registers, four seven-segment displays, 33 resistors, two capacitors, 4 connector rows and the board.

Its function is simple: The shift registers (74HC595) switch the cathodes of the LEDs to ground. Each LED has a series resistor to limit the current. Via SPI the appropriate bit patterns are shifted to the LEDs. These patterns are latched until they get changed again.

LED7 is cascadeable (theoretically to infinity... ). The output drivers of the 74HC595 can be switched off. A PWM signal at pin 3 (off) allows the display to be dimmed.

! Technical Data


  • Board 25.25mm x 51.20mm
  • SPI
  • Current consumption 98mA (all segments on) 0.4mA (all segments off)
  • Weight 13 gramms
  • Temperature range -40 to +85°
-> Assembly1
-> Assembly2
-> Diagram

! Prices

Part Code Details EUR*
led7 LED7 board 29.00
led7-10 Ten-pack LED7 232.00
*VAT and shipment not included. Quantity discounts on inquiry. Products: Interface Modules