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Unused LCDCAP pin in MSP430F47127

da
Expert 2780 points
Other Parts Discussed in Thread: MSP430F47127, MSP430F6779
My customers use the MSP430F47127.

In LCD_A of MSP430F47127, when the charge pump is enabled, you will need to
connect the capacitor to LCDCAP pin.
If at the charge pump is not enabled, can I How LCDCAP pin?
Regards,
  • 0
    Guru 74080 points
    The user's guide does not mention this pin in the table about the recommended connection of unused pins. I would leave it open.
  • 0 in reply to Dennis Eichmann
    Expert 2780 points

    When you don't want to use LCDCAP in LCD of F5/F6x_B, it's connected with VSS.

    Should F47147 also connect LCDCAP to VSS?

    Best Regards,

  • 0 in reply to da
    Guru 74080 points

    Hi Da!

    Yes, you're right, the User's Guide for the MSP430x5xx and MSP430x6xx tells you to tie LCDCAP to DVss if not used. The datasheet (took the one from the MSP430F6779) also warns you to not leave it open. But the User's Guide also mentions a CPCAP (charge pump capacitor) that shall be left open if not used. I agree that this is a little bit confusing. On the other hand I think that TI would have placed this warning in datasheet of the MSP430F47127 as well if it would be required. Possible that the hardware module works different. Did you look at another datasheet of the MSP430x4xx family?

    Maybe there is one from TI that can gather this information.

    Dennis

  • 0 in reply to Dennis Eichmann
    Expert 2780 points
    HI Dennis

    In addition, do you know what I this damage?

    slau056l p733
    > Note: Capacitor Required For Internal Charge Pump
    > A 4.7 μF or larger capacitor must be connected from pin LCDCAP to ground
    > when the internal charge pump is enabled. Otherwise, damage can occur.

    msp430f47127.pdf p45
    > Enabling the internal charge pump with an external capacitor smaller than
    > the minimum specified might damage the device.

    Da

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