SX8661 datasheet(59/88 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

5.6

Analog Output Interface Parameters

Analog Output

Interface (AOI) Parameters

Address

Name

Bits

Description

7:6

Reserved (0x00).

5:4

Defines AoiLevelDuringBuzzer (same for A&B).

0x00: AOI button level (default)

0x01: AOI Idle level

0x10: min level (0V)

0x11: max level( VDD)

Defines Aoi pwm period (same for A&B).

0: 0xFF (255) (default)

1: 0x3F (63)

0x2B

AoiCfg

2:0

Reserved (0x01)

Button[7]

Button[6]

Button[5]

0x2C

AoiBtnMapMsb

7:0

Button[4]

Button[3]

Button[2]

Button[1]

0x2D

AoiBtnMapLsb

7:0

Button[0] or Proximity

Maps a button touch to one of the two Analog Output

Interfaces (AOI-A / AOI-B), or both.

00 : None

01 : AOI-A (GPIO7)

10 : AOI-B (GPIO6)

11 : Both

Default: 0x5555, i.e. Btn[7..0] mapped on AOI-A

0x2E

AoiLevelBtn0

7:0

0x2F

AoiLevelBtn1

7:0

0x30

AoiLevelBtn2

7:0

0x31

AoiLevelBtn3

7:0

0x32

AoiLevelBtn4

7:0

0x33

AoiLevelBtn5

7:0

0x34

AoiLevelBtn6

7:0

0x35

AoiLevelBtn7

7:0

0x36

AoiLevelIdle

7:0

Defines the level index (cf Table 8) for Buttons, Idle or Proximity (for CAP0)

The level index should be smaller or equal to Aoi pwm period as defined in

AoiCfg[3].

0x00: 0

0x01: 1

…

0xFF: 255

Default AoiLevelBtn0: 0xFF

Default AoiLevelBtn1: 0x2E

Default AoiLevelBtn2: 0x45

Default AoiLevelBtn3: 0x5D

Default AoiLevelBtn4: 0x74

Default AoiLevelBtn5: 0x8B

Default AoiLevelBtn6: 0xA3

Default AoiLevelBtn7: 0xBA

Default AoiLevelIdle: 0xFF.

Table 22

AOI Parameters

AoiBtnMap

This register is used to map the available buttons to SWI-A, AOI-B or both. For example, to map buttons 0 to 3

and buttons 4 to 7 on AOI-B, write the following value to the AoiPwmBtnMap register

AoiCfg = 0xAA55;

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