SX8661Z datasheet(46/87 Pages) SEMTECH

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ADVANCED COMMUNICATIONS & SENSING

DATASHEET

Revision v4.0, February 2016

www.semtech.com

SX8661Z

Low Power, Capacitive Button Touch and Proximity Controller

(8 sensors) with LED Drivers and Analog Output

Capacitive Sensors Parameters

Address

Name

Bits Description

0x7: 7 seconds

0x8: 16 seconds

0x9: 18 seconds

…

0xE: 28 seconds

0xF: 60 seconds

0x70

CapProxEnable

7:0

Enables proximity sensing.

0x46: OFF

0x74: ON

Table 14

Capacitive Sensors Parameters

CapModeMisc:

By default the ASI is using an individual sensitivity for each CAP pin (with proximity sensor set to maximum

sensitivity while touch sensors are set to a lower one). The individual sensitivity mode results in longer sensing

periods than required in common sensitivity mode.

The ASI can use common sensitivity for all capacitive sensors in the case overlay material and sensors sizes

are about equal. The register bits CapSensitivity0_1[7:4] determine the sensitivity for all sensors in common

sensitivity mode.

CapMode7_4, CapMode3_0:

The CAP7 to CAP0 pins can be set as a button or disabled depending on the application.

CAP0 can be used for proximity sensing (additionally set register CapProxEnable).

minimum

maximum

Buttons

zero

seven

Table 15

Number of buttons (with CAP0 = proximity)

minimum

maximum

Buttons

one

eight

Table 16

Number of buttons (with CAP0 = button or disabled)

Buttons and disabled CAP pins can be attributed freely (examples in Figure 50).

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