A data entry device includes a pair of key pods adapted for use with left and right hands of a user. The system and method includes at least two PN component codes, wherein the at least two PN component codes are relatively prime. Stimulation electrodes may be provided on a stimulation pad and sensors may be provided on a sensing pad, which may be designed to conform to an anatomical feature. Additionally, a switching circuit and accompanying switching method provide for efficiently supplying peak current to the capacitive load during voltage fluctuation in the voltage waveform. Furthermore, the method and device can also quickly, flexibly, accurately change the currently displayed position.