CAP1114 datasheet(44/102 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.1 (02-04-11)

SMSC CAP1114

DATASHEET

6.4.1

Absolute Position

The absolute position of a single touch is available from this register. By interpolating information from

up to 3 adjacent buttons, 16 different positions are calculated by the CAP1114 from the center of one

button to the center of each adjacent button. The bits will encode a range from 2 to 98 indicative of

where the touch occurred. Table 6.6 shows an example of the settings assuming a single button is

pressed.

If a slide is detected on the Grouped sensors, the POS[6:0] bits will indicate the most recently touched

sensor (i.e. where the slide ended) however will not indicate where the slide originated.

APPLICATION NOTE: The register will be cleared to a value of 00h when it is read. It will be set to a valid position

when the next ALERT is generated. It will be updated at the respective repeat rate for a slide

or press and hold event regardless of whether it has been read or not. Therefore, it will only

show the position of the last touch detected at the time of the interrupt.

6.4.2

Volumetric Data

If they are setup to present Volumetric Data (see Section 6.14), the bits will encode a range from 0 to

100. This value is updated based on the Grouped sensor activity:

A slide in the “UP” direction will increase the volumetric data by the Volumetric Step setting (see

Section 6.6) whenever an interrupt is generated (including extra interrupts generated after the slide

is complete).

A slide in the “DOWN” direction will decrease the volumetric data by the Volumetric Step setting

(see Section 6.6) whenever an interrupt is generated (including extra interrupts generated after the

slide is complete)

A tap (see Section 5.5.1) on the “UP” side will increase the volumetric data by a value of 1.

A tap on the “DOWN” side will decrease the volumetric data by a value of 1.

A press and hold (see Section 5.5.2) on the “UP” side will increase the volumetric data by a value

of 1 at every repeat rate interval.

A press and hold (see Section 5.5.2) on the “DOWN” side will decrease the volumetric data by a

value of 1 at every repeat rate interval.

The bits are read / write.

Table 6.6 Example Slider Absolute Position Decode

TOUCH POSITION

POS[6:0]

SETTINGS

CS8

02h (2d)

CS9

12h (18d)

CS10

22h (34d)

CS11

32h (50d)

CS12

42h (68d)

CS13

52h (82d)

CS14

62h (98d)

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