SX8661 datasheet(47/88 Pages) SEMTECH

47 / 88 page

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

5.3

Capacitive Sensors Parameters

Address

Name

Bits Description

7:3 Reserved (0x00)

0x09

CapModeMisc

2:0 IndividualSensitivity Defines common sensitivity for all sensors or individual sensor

sensitivity.

000: Common sensitivity settings (CapSensitivity0_1[7:4])

100: Individual sensitivity settings (CapSensitivityx_x) (default)

Else : Reserved

0x0A

Reserved

7:0 Reserved (0x00)

7:6 CAP7 Mode

Default Button

5:4 CAP6 Mode

Default Button

3:2 CAP5 Mode

Default Button

0x0B

CapMode7_4

1:0 CAP4 Mode

Default Button

7:6 CAP3 Mode

Default Button

5:4 CAP2 Mode

Default Button

3:2 CAP1 Mode

Default Button

0x0C

CapMode3_0

1:0 CAP0 Mode

Defines the mode of the CAP pin.

00: Disabled

01: Button

10: Reserved

11: Proximity (CAP0),

Reserved (CAP6,..CAP1)

Default: 0x5557

Default Proximity

7:4 CAP0 Sensitivity - Common Sensitivity

0x0D

CapSensitivity0_1

3:0 CAP1 Sensitivity

7:4 CAP2 Sensitivity

0x0E

CapSensitivity2_3

3:0 CAP3 Sensitivity

7:4 CAP4 Sensitivity

0x0F

CapSensitivity4_5

3:0 CAP5 Sensitivity

7:4 CAP6 Sensitivity

0x10

CapSensitivity6_7

3:0 CAP7 Sensitivity

Defines the sensitivity.

0x0: Minimum

0x1: 1

…

0x7: Maximum

0x8..0xF: Reserved

Default CapSensitivity0_1: 0x72

Default CapSensitivity2_3: 0x22

Default CapSensitivity4_5: 0x22

Default CapSensitivity6_7: 0x22

0x11

Reserved

7:0 Reserved (0x00)

0x12

Reserved

7:0 Reserved (0x00)

0x13

CapThresh0

7:0 CAP0 Touch Threshold

0x14

CapThresh1

7:0 CAP1 Touch Threshold

0x15

CapThresh2

7:0 CAP2 Touch Threshold

0x16

CapThresh3

7:0 CAP3 Touch Threshold

0x17

CapThresh4

7:0 CAP4 Touch Threshold

0x18

CapThresh5

7:0 CAP5 Touch Threshold

0x19

CapThresh6

7:0 CAP6 Touch Threshold

0x1A

CapThresh7

7:0 CAP7 Touch Threshold

Defines the Touch Threshold ticks.

0x00: 0,

0x01: 4,

…

0xA0: 640 (default),

…

0xFF: 1020

7:4 Reserved (0x00)

0x1B

CapPerComp

3:0 Periodic Offset Compensation

Defines the periodic offset compensation.

0x0: OFF (default)

0x1: 1 second

0x2: 2 seconds

…

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