SX8663 datasheet(45/64 Pages) SEMTECH

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ADVANCED COMMUNICATIONS & SENSING

Rev5 4

th August 2011

www.semtech.com

SX8663

Capacitive Button Matrix (up to 36) and Proximity Controller

with Individual LED Drivers and Buzzer Output

5.5

Proximity (PS) Parameters

Proximity

Parameters

Address

Name

Bits

Description

0x2B

Reserved

7:0

Reserved (0x00)

Proximity enable:

0: OFF (PK=CAP11 if enabled) (default)

1: ON (PS = CAP11; PK =CAP10 if enabled)

6:5

Prox events to be reported on NIRQ:

00 : None

01 : Close (same as touch for buttons)

10 : Far (same as release for buttons)

11 : Both (default)

4:2

Defines the MK LEDs intensity during proximity “close” :

000: OFF, proximity status reported on GPIO7 (if set as GPO + Autoligth ON)

001: 3%

010: 5%

011: 8%

100: 10%

101: 12%

110 : 14%

111: 16% (default)

Reserved

0x2C

ProxCfg

Defines the Prox LED (GPIO7) status when a button (MK or PK) is touched:

0: OFF

1: ON (default)

7:4

Defines the delay between proximity “far” and start of fading out of MK LEDs

(single fading)

0x0: instantaneous (default)

0x1: 200 ms

0x2: 400 ms

0x3: 600ms

…

0xA: 2s

0xB: 4s

0xC: 6s

0xD: 8s

0xE: 10s

0xF: 12s

3:2

Defines the number of samples at the scan period for determining proximity

“far” status.

00 : no debounce, use incoming sample (default)

01 : 2 samples debounce

10 : 3 samples debounce

11 : 4 samples debounce

0x2D

ProxDebounce

1:0

Defines the number of samples at the scan period for determining proximity

“close” status.

00 : no debounce, use incoming sample (default)

01 : 2 samples debounce

10 : 3 samples debounce

11 : 4 samples debounce

0x2E

ProxHysteresis

7:0

Defines the proximity hysteresis corresponding to a percentage of the CAP

thresholds (defined in Table 12).

0x00: 0%

0x01: 1%

…

0x0A: 10% (default)

…

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