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MSP430G2102: Capacitiive Sensing - Active Guard Ring

Part Number: MSP430G2102


I am designing a high volume liquid level sensory using the MSP430G2102.  The initial is design is working well.  However, we would like to implement an active guard ring to improve performance.  I have read app notes using an active guard ring but none that include using an MSP part.  Can you please let me know how I can implement this feature from both the hardware and software side.