SX8661 datasheet(12/88 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

FUNCTIONAL DESCRIPTION

3.1

Quickstart Application

The SX8661 is preconfigured (Quickstart Application) for an application requiring proximity and seven buttons,

with one Analog Output Interface and seven LED drivers using PWM fading. Table 7 summarises the default

configuration of the eight GPIOs available on the SX8661 Quickstart application.

GPIO

Function

Fading Mode

Comments

LED

Single Fading Mode

Autolight, mapped on Btn1 (100% ON) and proximity (50% ON)

LED

Single Fading Mode

Autolight, mapped on Btn2 (100% ON) and proximity (50% ON)

LED

Single Fading Mode

Autolight, mapped on Btn3 (100% ON) and proximity (50% ON)

LED

Single Fading Mode

Autolight, mapped on Btn4 (100% ON) and proximity (50% ON)

LED

Single Fading Mode

Autolight, mapped on Btn5 (100% ON) and proximity (50% ON)

LED

Single Fading Mode

Autolight, mapped on Btn6 (100% ON) and proximity (50% ON)

LED

Single Fading Mode

Autolight, mapped on Btn7 (100% ON) and proximity (50% ON)

AOI-A

Not applicable

Analog Output Interface A (VDD=3.3V)

Prox = Idle : 3.3V

Btn1: 0.6V

Btn2: 0.9V

Btn3: 1.2V

Btn4: 1.5V

Btn5: 1.8V

Btn6: 2.1V

Btn7: 2.4V

Table 7

Quickstart Application GPIO configuration

Implementing a schematic based on Figure 6 will be immediately operational after powering without programming

the SX8661 (even without host).

The default sensitivity is set to 0x02 for all button sensors (assumed button sensor area approximately 1 cm

covered by 2mm thick acrylic overlay material) and 0x07 for the proximity sensor (typical 4 x 8 cm

2).

Figure 6

Quickstart Application

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