sx8647 Semtech Corporation, sx8647 Datasheet - Page 45

• Manufacturer Part Number: sx8647
• Description: Ultra Low Power, Capacitive Wheel Touch Controller 8 Sensors With Enhanced Led Drivers
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
CapThresh0, CapThresh1, CapThresh2, CapThresh3, CapThresh4, CapThresh5, CapThresh6, CapThresh7:
CapPerComp:
Revision 7_6, February 10
The maximum number of ticks that can be obtained depends on the selected sensitivity as illustrated in Table
17.
For each CAP pin a threshold level can be set individually.
The threshold levels are used by the SX8647 for making touch and release decisions on e.g. touch or no-
touch.
The details are explained in the sections for the wheel.
The SX8647 offers a periodic offset compensation for applications which are subject to substantial
environmental changes. The periodic offset compensation is done at a defined interval and only if the wheel is
released.
Table 17
Sensitivity
© 2010 Semtech Corp.
1
2
3
4
5
6
7
0
Touch Controller (8 sensors) with Enhanced LED Drivers
ASI Maximum Tick Levels
45
Maximum Tick Level
Approximate
1000
2000
3000
4000
5000
6000
7000
8000
Ultra Low Power, Capacitive Wheel
DATASHEET
www.semtech.com
SX8647