Cypress CapSense CY8C20x36 Guide de l'utilisateur télécharger pdf (Page 25)

Getting Started with CapSense

Document No. 001-64846 Rev. *I 25

Figure 2-21. LED Sourcing and Sinking Configuration

CapSense Controller

VDD

CapSense

button

CapSense Controller

CapSense

button

LED

src

snk

src

VDD

ON OFF ON

snk

VDD

ON OFF ON

OFF

LED in Sourcing Mode

LED in Sinking mode

2.7.1.1.2 Advanced LED Effects

For user interfaces that require sophisticated visual effects, a single hardware PWM or timer can be used to drive the

LEDs. By varying the duty cycle of the PWM output, you can achieve advanced effects, such as variable LED

brightness, fading, and breathing. A single hardware PWM or timer can be used to drive multiple LEDs.

2.7.1.1.3 LED Brightness

By varying the duty cycle of the PWM output, you can adjust the LED brightness as shown in Figure 2-22. This

enables adjusting your user interface brightness in response to ambient lighting conditions.

Figure 2-22. LED Brightness Control

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Cypress CapSense CY8C20x36 Guide de l'utilisateur Page 25