CAP1214 datasheet(28/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10)

SMSC CAP1214

DATASHEET

5.5.3

Slider

The Grouped sensors have the capability to detect a slide in either the “UP” or “DOWN” direction as

referenced by the sensor numbers that are used. For example, an “Up” direction slide would be

detected if CS8 detected a touch, followed by CS9, then by CS10, etc. Likewise, a “Down” direction

slide would be detected if CS10 detected a touch, followed by CS9, then by CS8, etc.

Slides in either direction are configured to flag an interrupt and to cause an LED to be actuated

(separate for each direction). The Slide is detected independently of a Press and Hold or a Tap

condition and only one condition may be present at any one time.

So long as a slide is maintained in either direction, it will flag an interrupt at the programmed repeat

rate (as determined by the RPT_RATE_SL bit settings). If the slide is removed or changes direction,

it will reset and return to normal operation.

5.5.4

Relative Position

The CAP1214 has the option to indicate the relative position of a touch on the Grouped sensors. This

value is stored either as a scaled number from 2 to 98 indicating where a tap, press and hold, or the

end of a slide was detected or as a 8-bit number that represents volumetric data. When configured to

store volumetric data, the user may write a base setting at any time that is modified based on Grouped

sensor behavior (see Section 6.4).

5.5.5

Slider Velocity

The repeat rate can be dynamically increased based on the speed of a slide. This permits slow sliding

motions to have precise, step-by-step volume control and faster motions to generate increasingly fast

volume changes.

Two techniques are employed to increase the number of interrupts generated based on speed. First,

the slide speed is measured and the repeat rate is increased to provide more interrupts for the same

distance traveled relative to a slower slide. Second, additional interrupts are generated immediately

after the slide ends to further increase the change in volume. The number of additional interrupts is

based on slide speed; both of these dynamic slider behaviors are controlled by the Slider Velocity

5.6

Ungrouped Sensor Behavior

The CAP1214 Grouped sensors have the option to be used as individual buttons. When the group is

broken (via the VOL_UP_DOWN bit - see Section 6.33), buttons CS8 and CS14 will adopt one type

of behavior while buttons CS9 - CS13 will adopt another. In all cases, a slide will not be detected.

5.6.1

CS9 - CS13 Ungrouped Behavior

These buttons will cause the corresponding status bit in the Button Status 2 register (see Section 6.2)

to be asserted when a touch is detected. This touch detection uses the button queue and button repeat

rate settings. They will use the slider maximum duration and multiple touch settings.

5.6.2

CS8 and CS14 Ungrouped Behavior

CS8 and CS14 will generate interrupts based on the duration of the touch detected, similar to a Tap

and Press and Hold events. Furthermore, these sensors will generate interrupts at the Grouped

Sensors repeat rate based on whether a Tap or Press and Hold event has been detected.

If a touch is detected on CS8, the DOWN status bit will be set in addition to either TAP or PH.

If a touch is detected on CS14, the UP status bit will be set in addition to either TAP or PH.

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