CAP1214 datasheet(44/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10)

SMSC CAP1214

DATASHEET

6.4

Slider Position / Volumetric Data Register

The Slider Position / Volumetric Data Register indicates the absolute position of a Tap, Slide, or Press

and Hold event detected on the Grouped sensors (slider). Alternately, the register stores volumetric

data that increases or decreased based on detected operations on the Grouped sensors (slider).

Bits 6-0 - POS[6:0] - Indicate absolute position or volumetric data as determined by the POS_VOL bit

(see Section 6.14).

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 CAP1214 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: When the device enters the Deep Sleep state, the Slider Position / Volumetric Data Register

(06h) is cleared, if the register is set to represent position data.

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.

Table 6.5 Slider Position / Volumetric Data Register

ADDR

R/W

DEFAULT

06h

R-C /

R/W

Slider Position /

Volumetric Data

POS[6:0]

00h

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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