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Interfacing MSP430 2with 74LS47

Manzar Laghari
Prodigy 90 points

Other Parts Discussed in Thread: SN74LS47, MSP430FR4133

Hello all

I am very new to MSP430 launchpad. So i am seeking for help.

I am using MSP430G2 family to code in (CC studio) for designing a voltmeter.

MSP430 signal is drived through 74LS47 seven segment decoder IC to 3 parallel connected 7 segment displays for output. I have trouble shooted all other parts of the circuit but i am suspecting an error in interfacing with 74LS47 IC, i am getting un desired output at seven segment displays.

Your response is highly appreciated. Thanks

  • 0
    TI__Guru**** 223677 points
    Hello Manzar,

    I'm moving this post to the Logic Forum as it is the SN74LS47 device that you are having trouble with. However you should provide what logic is being input to the SN74LS47 as well as the output given vs. output expected if you want to receive any help from the logic experts.

    Regards,
    Ryan
  • 0
    TI__Intellectual 2765 points

    As Ryan suggested, it's difficult to understand what might be going wrong given the question asked. There isn't enough background to understand what to suggest. I'm not familiar with the 74LS47 device. 

    As an alternative, you might try using one of the MSP430 LaunchPads which include a display - such as the MSP-EXP430FR4133. This could be a simple, easy way to get started creating your meter with the MSP430. There's even a workshop chapter that explains how to use the MSP430FR4133 LCD controller. Just an idea...

  • 0 in reply to Ryan Brown1
    Prodigy 90 points

    Thanks for your response.
    Actually I want to make PCB of this circuit so rather to jump directly for designing PCB schematic/board. i am trying to bring in working condition at bread board so that i can eaily change the components where ever it is needed. 

    I have downloaded source code and made little change in it to prepare code in working position. I verified by directly connecting 7 segment displays with MSP430 that is fine. But when i plug 74ls47 in intermediate of this in intermediate of MSP430 and 7 segment display. I failed to satisfy my self with results

    Link of circuit diagram and code:
    www.circuitvalley.com/.../msp430g2231-volt-meter-adc.html

  • 0 in reply to sgspecker
    Prodigy 90 points
    Your quick supported is supportive.
    But I have couple of MSP-430G2 launchpads, I am seeing a ray of hope to design it using this simple pad.
    Thanks
  • 0
    Guru 326500 points

    The 3.3 V CMOS output of the MSP is compatible with the TTL input of the LS47.

    What does "failed to satisfy my self with results" mean?