Cypress CapSense CY8C20x36 Betriebsanweisung PDF herunterladen (Seite 28)

28 Document No. 001-64846 Rev. *I Getting Started with CapSense

Figure 2-28. Implementing LCD Feedback with CapSense on CapSense Plus

2.7.2 Haptic Feedback

Haptic, or tactile, feedback uses vibration to let you know that the system has detected a finger touch.

Figure 2-29. Cypress Haptics Ecosystem

Vibrations are created by an actuator (DC motor) with eccentric rotating mass (ERM). When the end user touches a

CapSense button, a touch signal is sent to the CapSense controller. The CapSense controller processes the data

and drives the actuator to get a particular haptics effect. The CY8C20XX6H CapSense controller can generate 14

predefined haptics effects. PWM and Timer user modules are used to generate a haptics signal to drive the actuator.

The PWM signal is updated periodically. The Timer user module is used to generate a 5-mS periodic (for Haptic-

effects generation) interrupt to update the effect that is currently being played. The Amplifier supplies the required

current to the actuator. The firmware can also generate the 5-mS timer to save a digital block, but this increases the

CPU load. The PWM user module is configured to generate output signals of frequency greater than 22 kHz to drive

the DC motor. This frequency is outside the audible range of the human ear.

The Haptics user module datasheet has more information about the 14 predefined haptics effects and also provides a

code example. This document is available at http://www.cypress.com/?rID=55635.

To know more about CY8C20xx6H, refer to the device datasheet at http://www.cypress.com/?rID=50279.

If you need a level 1 kit or any further assistance, contact [email protected].

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Cypress CapSense CY8C20x36 Betriebsanweisung Seite 28