Electronic Chips

7-Segment and Decoder

Overview

Display decimal number (0~9) on a 7-segment display

• Inputs: 4-bit numbers (D C B A) // (00001111)

• Output:

  • 7-segment decoder: 7-bit numbers ( a to g)

  • 7-segment display: decimal number 0~9

Specification

• 7-segment display: common anode

• 7-segment decoder: 74LS47N (datasheet download)

BCD 7-segment decoder

Model: 74LS47N (datasheet download)

• All output pins are active low

7-segment Display

• Common anode: (common pin is connected to VCC)

• Giving ‘LOW’ to the pin -> LED ON

• Needs a load resistor for each pin

Connecting to MCU

Display ‘0’ to ‘9’ on 7-segment display by giving

• Input (D,C,B,A) in range of (0,0,0,0)~(1,0,0,1)

• Use Arduino Uno