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MSP430 with 5V LCD

Kika
Intellectual 420 points
Other Parts Discussed in Thread: MSP430F4152, SN74LVCC4245A

Hello,

We need to drive an segment LCD (32 segments,1/4 duty) through MSP430 LCD controller,
but the LCD's supply is 5V and the MSP430 3.3V.
Could you please let me know if there is any good solution to connect 5V LCD
through MSP430F4152.
An application note recommends level converter SN74LVCC4245A,
could you please let me know if there is any reference schematics in case of
MSP430 LCD driver connected to a 5V LCD panel.

Regards.

  • 0
    Guru 58965 points

    Are you talking about a "LCD Glass" or a "LCD Glass with LCD controller on the back of the Glass"?

    MSP430F4151 is capable of driving a "LCD Glass" directly. It does that with an internally generated voltage which is not 3.3V (nor 5V).

    If you are using MSP digital I/O to interface to an external LCD controller (such as the one on the back of a LCD Glass), then you might need to match the digital levels.

  • 0 in reply to old_cow_yellow
    Intellectual 420 points

    Thank you OCY,

    Yes it is "LCD Glass" without controller.
    you say, MSP430F4152 is capable of driving a "LCD Glass" directly,
    does it mean it can drive the LCD Glass which has Supply Voltage: 5V.

    The MSP430F4152's datasheet mentoins the MAX LCD voltage as 3.6V,
    I have to check the Datasheet of the LCD Glass, if the minum HIGH level
    LCD input is more than 3.6V, then I believe we cannot connect MSP430 directly.

    In case of level converter is there any low cost converter IC?

    Regards.

  • 0 in reply to Kika
    Guru 58965 points

    MSP430F4152 can adjust the voltage used to drive the LCD from about 2.6V to about 3.6V. It then drives the COMx and Sy pins to 0, 1/3, 2/3, or 1* that full voltage. Thus the segments of the LCD Glass will see the equivalent of AC with up to 2 times that full voltage peak-to-peak. This is up to 7.2V

    See MSP430F4xx User's Guide for full explanation.

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