Seven Segment Board
Contents
1. 13 DIO 11 DISPON 7 DIO_5 SEG F 14 GND GND 7 Algorithm Since the signals that drive the segments are shared by the 8 displays the segments of only one display can be driven at a time Each display is turned on successively for a small period of time 1 5ms to avoid flicker and by persistence of vision all of them appear to be on simultaneously Persistence of vision is the phenomenon of the eye by which even nanoseconds of exposure to an image result in milliseconds of sight Wikipedia org 7 1 Selecting a digit on the board A digit of the seven segment display board can be selected by using three control lines DSEL 0 DSEL 1 and DSEL 2 Below table explains how to select a digit using the 3 control lines Table 1 2 Digit Selection DSELO DSEL1 DSEL2 DIGIT NO 0 0 0 DIGIT 1 0 0 1 DIGIT 2 0 1 0 DIGIT 3 Zilogic Systems Page 2 Seven Segment Board User Manual Rev 1 0 DSELO DSEL1 DSEL2 DIGIT NO 0 1 1 DIGIT 4 1 0 0 DIGIT 5 1 0 1 DIGIT 6 1 1 0 DIGIT 7 1 1 1 DIGIT 8 7 2 7 Segment Display The algorithm for displaying a 7 segment digit is given below 1 Turn off all the 7 segment displays 2 Turn on off segments by driving the segment signals SEGx The segment signals to be driven for each hexadecimal digit is given in the following table 3 Select the 7 segment display by driving one of DIGIT1 DIGIT2 i DIGIT8 Character SEG A H Ox3F 0x06 Ox5B 0x4F 0x66 0x6D 0x7D 0x072. Ox7F 0x67 o AN Oa A OON O The MSB of segment signals 7th bit is used to switch on the dot separator 7 3 Multiplexed 7 segment Display The algorithm for displaying multiple 7 segment digits simultaneously is given below a select the 7 segment Turn off leds in the selected 7 segment Drive the segment data pins corresponding to the value to be displayed Generate a 1 5ms delay using a timer Select next digit ooo o Goto step b Zilogic Systems Page 3
3. Seven Segment Board User Manual 1 0 Oct 2011 ZILOGIC SYSTEMS Seven Segment Board User Manual Rev 1 0 This work is licensed under the Creative Commons Attribution Share Alike 2 5 India License To view a copy of this license visit http creativecommons org licenses by sa 2 5 in or send a letter to Creative Commons 171 Second Street Suite 300 San Francisco California 94105 USA Seven Segment Board User Manual Rev 1 0 Table of Contents 1 SOVEN segment Boardi nannte ea Hi 1 1 OVELVIOW E 1 AS o OO AA 1 3 APPICALONS Lati la 1 4 Locating components eet erotic leia Bin 1 5 Power SUDDlV ani ee ML C D ot 1 6 COMMECUVIY 1 Te AGON m Et 2 Zilogic Systems Page iii Seven Segment Board User Manual Rev 1 0 Chapter 1 Seven segment board 1 Overview Seven segment display board has 8 seven segment LEDs lt can be used as a display device for displaying decimal numerals as an alternative for more complex dot matrix displays This multiplexed display board has a built in decoder needs only 3 control lines to select the required digit and 8 data lines shared to all 7segments All segments including decimal points are available for control so that customized readout is made possible The TTL compatible inputs allows this board work with most micro controllers and control systems 2 Features Standard 0 56 7 Segment LED Display 8 Digits for counter timer applications Su
4. pports decimal point Powered from motherboard via FRC header TTL compatible inputs Standard 0 1 FRC header for connection to control logic MCU Ready to go with Zilogic mother boards 3 Applications Digital clocks and calendars Electronic meters Weighing machines Currency displays and other numerical digital read outs 4 Locating components Below diagram explains the location of components on the board Figure 1 1 Front View 88888888 So 7 6 3s 4 3 2 1 5 Power Supply The seven segment display board is powered by the motherboard using a FRC 14 connector The 1st and 14th pin is connected to VCC and GND respectively 6 Connectivity The seven segment display board can be interfaced to the mother board using a FRC 14 connector The connection details are explained in the below diagram Zilogic Systems Page 1 Seven Segment Board User Manual Rev 1 0 The SEG pins are used to drive the value to be displayed on a 7 segment and the DSEL used to select the digit position on which the value has to be displayed Figure 1 2 Signal connection diagram ZKit 51 Seven segment board PIO HEADER Decoder FRC 14 Table 1 1 header to display signal mapping table Pin Motherboard Display Pin Motherboard Display 1 VCC VCC 8 DIO_6 SEG G 2 DIO 0 SEG A 9 DIO 7 SEG H 3 DIO 1 SEG B 10 DIO 8 DSEL 0 4 DIO 2 SEG C 11 DIO 9 DSEL 1 5 DIO 3 SEG D 12 DIO 10 DSEL 2 6 DIO 4 SEG E
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