SX8661Z datasheet(34/87 Pages) SEMTECH

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ADVANCED COMMUNICATIONS & SENSING

DATASHEET

Revision v4.0, February 2016

www.semtech.com

SX8661Z

Low Power, Capacitive Button Touch and Proximity Controller

(8 sensors) with LED Drivers and Analog Output

time

sd1

sd2

sd1

sd2

sd1

sd2

no prox, no touch

prox entered, no touch

prox left, no touch

inc_prox

dec_prox

del_prox

int_prox

Figure 37

LEDs in triple reporting mode proximity

Figure 37 shows an example of proximity detection and the reporting on LEDs. As soon as proximity is detected

all LEDs (2 LEDs are shown for simplicity) will fade in and stop at the proximity intensity level. In case proximity is

not detected anymore then the LEDs remain at the proximity intensity for a configurable time and then the fading

out will start.

time

sd1

sd2

sd1

sd2

sd1

sd2

no prox, no touch

prox entered, rapid touch

no touch, prox left rapidly

inc_prox

dec_touch

del_touch

int_touch

inc_touch

del_prox

dec_prox

∆

int_prox

Figure 38

LEDs in triple reporting mode proximity and touch

Figure 38 shows an example of proximity detection followed by a rapid touch on the sensor sd1.

The LEDs d1 and d2 will fade in as soon as proximity is detected (using the Inc_Prox parameter).

As soon as the finger touches the sensor sd1 the fading in of d1 will go to the ON intensity (using the touch

increment parameter).

The LED d2 remains at the proximity intensity level as sensors sd2 is not touched.

If the finger is removed rapidly the fading out of d1 will first use the touch decrement parameter to the proximity

intensity level. If the finger leaves the proximity region d1 and 2 will fade out simultaneously using the proximity

delay and decrement parameters.

SX8661Z Datasheet(PDF) 34 Page - Semtech Corporation

SX8661Z Datasheet(HTML) 34 Page - Semtech Corporation

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