SX8644I05AWLTRT Semtech, SX8644I05AWLTRT Datasheet - Page 54

• Manufacturer Part Number: SX8644I05AWLTRT
• Description: 12-ch Capacitive Touch Solution (Button & Slider)
• Manufacturer: Semtech

ADVANCED COMMUNICATIONS & SENSING
The maximum position (SldPosMax) is defined by:
Slow varying slider ticks due to environmental changes are handled as buttons in the previous section.
If the ticks pass below the slider negative threshold for more than the compensation negative max counter then an
offset compensation phase will be triggered.
If the ticks pass above the slider average positive threshold then the averaging filters will be held.
A finger that moves very slowly over the slider is not considered as a movement. The status move low and move
high will not be set.
A finger that moves faster on the slider will change the movement status.
A movement is detected if the difference of the position for two succeeding samples at the scanning rate goes
beyond the movement threshold (SldMoveThresh). A large movement threshold requires very rapid finger
movements, while a small movement threshold detects more easily movements but gets sensitive to noise
variations as well.
Revision 7_3, January 10
with:
N is the number of sensors in the slider
SldPosMax
=
Touch Controller (12 sensors) with Enhanced LED Drivers
© 2009 Semtech Corp.
SldNorm
32
54
×
Ultra Low Power, Capacitive Button and Slider
(
N
−
1
)
DATASHEET
www.semtech.com
SX8644