Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Table 5.5 Build History
BUILD
DEVICE
REASON FOR CHANGE
10h
11h
CAP1014
Initial Development
CAP1014-1
Activated Lid Closure circuitry
Activated Lid Closure circuitry and changed SMBus
address to 0101_100b
12h
CAP1014-2
5.4
Slider Position / Volumetric Data Register
Table 5.6 Slider Position / Volumetric Data Register
ADDR
06h
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
R-C /
R/W
Slider Position /
Volumetric Data
-
POS[6:0]
00h
The Slider Position 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 5.14).
5.4.1
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 CAP1014 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 5.7 shows an example of the settings assuming a single button is
pressed.
If a slide is detected on the Grouped sensors, then 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.
Table 5.7 Example Slider Absolute Position Decode
POS[6:0]
TOUCH POSITION
SETTINGS
CS8
CS9
02h (2d)
12h (18d)
22h (34d)
32h (50d)
CS10
CS11
SMSC CAP1014
Revision 1.65 (08-11-09)
DATA3S7HEET
SMSC [ SMSC CORPORATION ]
