sx8661 Semtech Corporation, sx8661 Datasheet - Page 49

• Manufacturer Part Number: sx8661
• Description: Low Power, Capacitive Button Touch And Proximity Controller 8 Sensors With Led Drivers And Analog Output
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
CapSensitivity0_1, CapSensitivity2_3, CapSensitivity4_5, CapSensitivity6_7, CapProxEnable:
The maximum number of ticks that can be obtained depends on the selected sensitivity and if proximity sensing is
enabled. This is illustrated in Table 18.
Revision v3.2, January 2011
The sensitivity of the sensors can be set between 8 values. The higher the sensitivity is set the larger the value
of the ticks will be.
The minimum sensitivity can be used for thin overlay materials and large sensors, while the maximum
sensitivity is required for thicker overlay and smaller sensors or proximity sensing.
The required sensitivity needs to be determined during a product development phase. Too low sensitivity
settings result in missing touches. Too high sensitivity settings will result in fault detection of fingers hovering
above the touch sensors.
The sensitivity is identical for all sensors in common sensitivity mode using the bits CapSensitivity0_1[7:4] and
can be set individually using register CapModeMisc[2:0].
Sensitivity
0
1
2
3
4
5
6
7
Table 18
Low Power, Capacitive Button Touch and Proximity Controller
(CapProxEnable = OFF)
Figure 52
Maximum Tick Level
© 2011 Semtech Corp.
Approximate
ASI Maximum Tick Levels
1000
2000
3000
4000
5000
6000
7000
8000
Button examples
49
(8 sensors) with LED Drivers and Analog Output
(CapProxEnable = ON)
Maximum Tick Level
Approximate
12000
16000
20000
24000
28000
32000
4000
8000
www.semtech.com
DATASHEET
SX8661