SX8648 datasheet(1/76 Pages) SEMTECH

Part #	SX8648

Description	Ultra Low Power, Capacitive Button and Slider Touch Controller (8 sensors) with Enhanced LED Drivers

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Manufacturer	SEMTECH [Semtech Corporation]

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ADVANCED COMMUNICATIONS & SENSING

DATASHEET

Revision 7_4, February 10

www.semtech.com

1

SX8648

Ultra Low Power, Capacitive Button and Slider

Touch Controller (8 sensors) with Enhanced LED Drivers

GENERAL DESCRIPTION

The SX8648 is an ultra low power, fully integrated 8-

channel solution for capacitive touch-buttons and

slider applications. Unlike many capacitive touch

solutions, the SX8648 features dedicated capacitive

sense inputs (that requires no external components)

in addition to 8 general purpose I/O ports (GPIO).

Each GPIO is typically configured as LED driver with

independent PWM source for enhanced lighting

control such as intensity and fading.

The SX8648 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 SX8648 incorporates a versatile firmware that

was specially designed to simplify capacitive touch

solution design and offers reduced time-to-market.

Integrated

multi-time

programmable

memory

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 SX8648 supports the 400 kHz I²C serial bus

data protocol and includes a field programmable

slave address. The tiny 4mm x 4mm footprint makes

it an ideal solution for portable, battery powered

applications where power and density are at a

premium.

TYPICAL APPLICATION CIRCUIT

KEY PRODUCT FEATURES

Complete Eight Sensors Capacitive Touch Controller for

Buttons and Slider

Pre-configured for 2 Buttons and a Slider

8 LED Drivers with Individual Intensity, Fading Control

and Autolight Mode

256 steps PWM Linear and Logarithmic control

High Resolution Capacitive Sensing

Up to 100pF of Offset Capacitance Compensation at

Full Sensitivity

Capable of Sensing through Overlay Materials up to

5mm thick

Extremely Low Power Optimized for Portable Application

8uA (typ) in Sleep Mode

80uA (typ) in Doze Mode (Scanning Period 195ms)

175uA (typ) in Active Mode (Scanning Period 30ms)

Programmable Scanning Period from 15ms to 1500ms

Auto Offset Compensation

Eliminates False Triggers due to Environmental

Factors (Temperature, Humidity)

Initiated on Power-up and Configurable Intervals

Multi-Time In-Field Programmable Firmware Parameters

for Ultimate Flexibility

On-chip user programmable memory for fast, self

contained start-up

"Smart" Wake-up Sequence for Easy Activation from Doze

No External Components per Sensor Input

Internal Clock Requires No External Components

Differential Sensor Sampling for Reduced EMI

400 KHz Fast-Mode I²C Interface with Interrupt

-40°C to +85°C Operation

APPLICATIONS

Notebook/Netbook/Portable/Handheld computers

Cell phones, PDAs

Consumer Products, Instrumentation, Automotive

Mechanical Button Replacement

ORDERING INFORMATION

Part Number

Temperature

Range

Package

SX8648I05AULTRT

1 -40°C to +85°C Lead Free MLPQ-UT28

1 3000 Units/reel

* This device is RoHS/WEEE compliant and Halogen Free

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SX8648 Datasheet(PDF) 1 Page - Semtech Corporation

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