CAP1298 datasheet(21/68 Pages) MICROCHIP

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DS00001571B-page 21

CAP1298

If a sensor input is the designated power button, an interrupt is not generated as soon as a touch is detected and repeat

rate is not applicable. See Section 4.9.3, "Interrupts for the Power Button".

APPLICATION NOTE: FIGURE 4-4: and FIGURE 4-5: show default operation which is to generate an interrupt upon

sensor pad release.

APPLICATION NOTE: The host may need to poll the device twice to determine that a release has been detected.

4.9.3

INTERRUPTS FOR THE POWER BUTTON

Interrupts are automatically enabled for the power button when the feature is enabled (see Section 4.6, "Power Button").

A touch must be held on the power button for the designated period of time before an interrupt is generated.

FIGURE 4-4:

SENSOR INTERRUPT BEHAVIOR - REPEAT RATE ENABLED

FIGURE 4-5:

SENSOR INTERRUPT BEHAVIOR - NO REPEAT RATE ENABLED

Touch Detected

INT bit

Button Status

Write to INT bit

Sensing Cycle

(35ms)

Min Press Setting

(280ms)

Interrupt on

Touch

Button Repeat Rate

(175ms)

Button Repeat Rate

(175ms)

Interrupt on

Release

(optional)

ALERT# pin

Touch Detected

INT bit

Button Status

Write to INT bit

Sensing Cycle

(35ms)

Interrupt on

Touch

Interrupt on

Release

(optional)

ALERT# pin

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