CAP1214 datasheet(30/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10)

SMSC CAP1214

DATASHEET

5.8.2

Grouped Sensor Interrupt Behavior

For grouped sensors, an interrupt is generated upon initial detection of a tap, slide, or press and hold

event. Subsequent interrupts are generated as follows:

1. For a slide event, an interrupt is generated based on the programmed repeat rate as well as the

velocity of the slide operation. See Figure 5.6 and Figure 5.7. Additional interrupts are generated

after the slide has finished. These extra interrupts are generated every round robin cycle (~35ms)

and the number is determined by the speed of the slide.

2. For a tap event there are no further interrupts. See Figure 5.4.

3. For a press and hold event, interrupts are generated based on the programmed repeat rate. If the

repeat rate is disabled, no further interrupts are generated. See Figure 5.5.

Figure 5.3 Button Interrupt Behavior - No Repeat Rate Enabled

Figure 5.4 Tap Interrupt Behavior

Touch Detected

ALERT Pin /

INT bit

Button Status

SMBus Write to

INT bit

Polling Cycle

(35ms)

Interrupt on

Touch

Optional

Interrupt on

Release

Touch Detected

ALERT Pin /

INT bit

Tap & UP / DOWN

Status

SMBus Write to

INT bit

Polling Cycle

(35ms)

M_PRESS

Setting (280ms)

Released before

M_PRESS

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