SX8661 datasheet(53/88 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

5.5

Button Parameters

Address

Name

Bits Description

7:6 Defines the buttons and proximity events reporting method on I2C, AOI, GPO,

Buzzer (see Table 21 for details).

00: All

01: Single (default)

10: Strongest

11: Reserved

5:4 Defines the buttons interrupt (for all buttons and proximity).

00 : Interrupts masked

01 : Triggered on Touch

10 : Triggered on Release

11 : Triggered on Touch and Release (default)

Defines the number of samples at the scan period for determining a release of a

button.

00 : no debounce, use incoming sample (default)

01 : 2 samples debounce

10 : 3 samples debounce

11 : 4 samples debounce

0x22

BtnCfg

2:0 Defines the number of samples at the scan period for determining a touch of a

button.

00 : no debounce, use incoming sample (default)

01 : 2 samples debounce

10 : 3 samples debounce

11 : 4 samples debounce

0x23

BtnAvgThresh

7:0 Defines the positive threshold for disabling the processing filter averaging (one

value for all buttons and proximity).

If ticks are above the threshold, then the averaging is suspended.

0x00: 0

0x01: 4

…

0x50: 320 (default)

…

0xFF: 1020

0x24

BtnCompNegThresh

7:0 Defines the negative offset compensation threshold (one value for all buttons and

proximity).

0x00: 0

0x01: 4

…

0xA0: 640 (default)

…

0xFF: 1020

0x25

BtnCompNegCntMax

7:0 Defines the number of ticks (below the negative offset compensation threshold)

which will initiate an offset compensation (one value for all buttons and proximity).

0x00: reserved

0x01: 1 sample (default)

…

0xFF: 255 samples

0x26

BtnHysteresis

7:0 Defines the button hysteresis corresponding to a percentage of the CAP

thresholds (defined in Table 15).

All buttons use the same hysteresis.

0x00: 0%

0x01: 1%

…

0x0A: 10% (default)

…

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