SX8661 datasheet(49/88 Pages) SEMTECH

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ADVANCED COMMUNICATIONS & SENSING

DATASHEET

Revision v3.2, January 2011

www.semtech.com

SX8661

Low Power, Capacitive Button Touch and Proximity Controller

(8 sensors) with LED Drivers and Analog Output

Figure 52

Button examples

CapSensitivity0_1, CapSensitivity2_3, CapSensitivity4_5, CapSensitivity6_7, CapProxEnable:

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].

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.

Sensitivity

Approximate

Maximum Tick Level

(CapProxEnable = OFF)

Approximate

Maximum Tick Level

(CapProxEnable = ON)

1000

4000

2000

8000

3000

12000

4000

16000

5000

20000

6000

24000

7000

28000

8000

32000

Table 18

ASI Maximum Tick Levels

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