LCD segment (Sx) and common (COMx) signal traces are continuously switching while the LCD is enabled and should, therefore, be kept away from sensitive analog signals such as ADC inputs to prevent any noise coupling. TI recommends keeping the LCD signal traces on one side of the PCB grouped together in a bus-like fashion. A ground plane underneath the LCD traces and guard traces employed alongside the LCD traces can provide shielding.

If the internal charge pump of the LCD module is used, place the externally provided capacitor on the LCDCAP pin as close as possible to the MCU. Connect the capacitor to the device using a short and direct trace and have a solid connection to the ground plane that supplies the VSS pins of the MCU.

For an example layouts and a more in-depth discussion of this topic, see Designing With MSP430™ MCUs and Segment LCDs.