CAP1114 datasheet(29/102 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1114

Revision 1.1 (02-04-11)

DATASHEET

Whenever an interrupt is generated, the INT bit (see Section 6.1) is set. The ALERT pin is cleared

when INT bit is cleared by the user. Additionally, when the INT bit is cleared by the user, status bits

are cleared only if no press is detected.

5.7.1

Button Interrupt Behavior

For non-grouped buttons, an interrupt is generated when a touch is detected. If the repeat rate is

enabled (see Section 6.14), then, so long as the touch is held, another interrupt will be generated

based on the programmed repeat rate (see Figure 5.2) and upon release.

5.7.2

Grouped Sensor Interrupt Behavior

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

event. Then, 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.

5.7.3

Wake from Deep Sleep

When the ALERT pin is driven high from an external source, it is also used to wake the device from

the Deep Sleep power state. When the device enters the Deep Sleep power state, the ALERT pin

output is put into a high-Z mode. It requires a pull-down resistor to pull it to the inactive state.

Furthermore, the CAP1114 will wait 5ms before it samples the ALERT pin for wake activity.

Figure 5.2 Button Interrupt Behavior - Repeat Rate Enabled (default)

Touch Detected

ALERT Pin /

INT bit

Button Status

SMBus Write to

INT bit

Polling Cycle

(35ms)

Button Repeat Rate

(175ms)

Optional

Interrupt on

Release

Interrupt on

Touch

Button Repeat Rate

(175ms)

Button Repeat Rate

(175ms)

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