Cypress CapSense CY8C20x36 Guía de usuario descargar pdf (Pagina 21)

Getting Started with CapSense

Document No. 001-64846 Rev. *I 21

Figure 2-15. Linear Slider

2.5.2.2 Diplexed Sliders

In a diplexed slider, each CapSense controller I/O pin is connected to two different slider segments. This allows a

design to have twice as many slider segments as there are I/O pins. For example, a diplexed 16-segment slider

requires only eight CapSense controller I/O pins.

Figure 2-16. 16-Segment Diplexed Slider

For a diplexed slider to work properly, the slider segments must be connected to the CapSense controller I/O pins in

a pre-determined order. The first half of the segments are connected to the CapSense controller I/O pins sequentially

(0, 1, 2 …7) and operate similar to a linear slider. The second half of the segments are connected to the same

CapSense controller I/O pins in a non-sequential order. This order exploits the fact that activation of one segment

results in partial actuation of neighboring segments. While slider actuation of one half of the slider results in aliasing

on to the other half, the levels will be scattered in the untouched half. Sensing algorithms search for strong adjacent

segment actuation and ignore scattered actuation to determine finger position on the slider accurately.

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Cypress CapSense CY8C20x36 Guía de usuario Pagina 21