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Compiler: IAR

Douaa Gouider
Prodigy 30 points
Other Parts Discussed in Thread: MSP430F425

Tool/software: TI C/C++ Compiler

Hi , I am  working actually on msp430f425 for emeter application , I use for this the tidc299 . My problem is when the emeter is in low power mode i want that my LCD display a word , sometimes it works and  the LCD diplay what i need but with a bad contrast and the most of time it doesn't work . is it due to no existing power supply  (NB: i have a battery backup on my emeter ) , or i need to change something in my code . can any one help me to know where is the problem ? 

  • 0
    TI__Mastermind 49692 points
    Hi Douaa,

    Thank you for your post. Are you using one of our EVMs or a custom board? Does the LCD behavior act differently when the board is powered by Mains or by Battery? Hopefully, whatever power supply you're using can supply enough current for everything to operate properly from a hardware standpoint. Also, make sure that the LCD you are using is supported by the MSP430F425 by checking Section 25.1 in the User's Guide and the datasheet. In the User's Guide, I found where it says that the LCD contrast can be controlled by the R03 voltage level with external circuitry, typically an additional resistor Rx to GND. Increasing the voltage at R03 reduces the total applied segment voltage decreasing the LCD contrast.

    The clock source for the LCD module is called fLCD. In Figure 13-1 in the User's Guide, ACLK is sourcing fLCD. Thus, you should be able to operate in LPM3 while periodically updating the LCD in an ISR.

    Regards,

    James

    MSP Customer Applications
  • 0
    TI__Mastermind 49692 points
    Hello,

    I'm closing this thread due to inactivity. If you have a new question, please start a new thread.

    Regards,

    James

    MSP Customer Applications

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