sx8662 Semtech Corporation, sx8662 Datasheet

sx8662

Manufacturer Part Number

sx8662

Description

Capacitive Button Matrix Up To 36 Controller With Individual Led Drivers And Buzzer Output

Manufacturer

Semtech Corporation

Datasheet

1.SX8662.pdf (60 pages)

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36 Capacitive Matrix Buttons

ADVANCED COMMUNICATIONS & SENSING

The SX8662 is an ultra low power, fully integrated

12-channel solution for capacitive touch-button

matrix applications (up to 36 keys). Unlike many

capacitive touch solutions, the SX8662 features

dedicated capacitive sense inputs (that requires no

external components) in addition to 8 general

purpose I/O ports (GPIO) which can be used to drive

up to 36 matrix LEDs (i.e. one per key). Each of the

on-chip

independent PWM source for enhanced visual effect

such as dimming, and breathing.

The SX8662 includes a capacitive 10 bit ADC analog

interface with automatic compensation up to 100pF.

The high resolution capacitive sensing supports a

wide variety of touch pad sizes and shapes and

allows capacitive buttons to be created using thick

overlay materials (up to 5mm) for an extremely

robust and ESD immune system design.

The SX8662 incorporates a versatile firmware that

was specially designed to simplify capacitive touch

solution design and offers reduced time-to-market.

Integrated

provides the ultimate flexibility to modify key firmware

parameters (gain, threshold, scan period, auto offset

compensation) in the field without the need for new

firmware development.

The SX8662 supports the 400 kHz I²C serial bus

data protocol and includes a field programmable

slave address. The tiny 5mm x 5mm footprint makes

it an ideal solution for portable, battery powered

applications where power and density are at a

premium.

Rev5 4

YPICAL

ENERAL

August 2011

GPIO/LED

PPLICATION CIRCUIT

ESCRIPTION

multi-time

cap11

cap9

cap7

cap6

cap5

cap4

cap0

cap1

cap2

cap3

cap4

cap5

cap6

cap7

cap8

cap9

cap10

driver

analog sensor

interface

programmable

micro processor

generation

clock

ROM

RAM

power management

SX8662

GPIO controller

equipped

PWM LED

controller

NVM

I2C

buzzer

gnd

gpio6

gpio5

gpio4

gpio3

gpio2

gpio1

gpio0

bottom plate

memory

with

HOST

* This device is RoHS/WEEE compliant and Halogen Free

SX8662I08AWLTRT

3000 Units/reel

PPLICATIONS

RDERING

with Individual LED Drivers and Buzzer Output

Complete Capacitive Touch-Button Solution

High Resolution Capacitive Sensing

Support of buzzer for audible feedback

User-selectable Button Reporting Configuration

Extremely Low Power

Programmable Scanning Period from 15ms to several seconds

Auto Offset Compensation

Multi-Time In-Field Programmable Firmware Parameters

for Ultimate Flexibility

No External Components per Sensor Input

Internal Clock Requires No External Components

Differential Sensor Sampling for Reduced EMI

Optional 400 KHz I²C Interface with Programmable Address

-40° C to +85° C Operation

Home Automation

White Goods

Printers

Notebook/Netbook/Portable/Handheld computers

Consumer Products, Instrumentation, Automotive

Mechanical Button Replacement

o Up to 36 Matrix Buttons

o Up to 36 LEDs Control for individual Visual Feedback

o Configurable Single or Continuous Fading Mode

o 256 steps PWM Linear and Logarithmic control

o Up to 100pF of Offset Cap. Compensation at Full

o Capable of Sensing up thru 5mm thick Overlay Materials

o 8uA (typ) in Sleep Mode

o 100uA (typ) in Doze Mode (195ms)

o 460uA (typ) in Active Mode (30ms)

o Eliminates false triggers due to environmental factors

o Initiated on power-up and configurable intervals

o On-chip user programmable memory for fast, self

Part Number

Capacitive Button Matrix (up to 36) Controller

with Auto Lightening

Sensitivity

(temperature, humidity)

contained start-up

RODUCT

NFORMATION

EATURES

-40° C to +85° C Lead Free MLPQ-W32

Temperature

Range

www.semtech.com

Package

SX8662

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