sx8644 Semtech Corporation, sx8644 Datasheet

sx8644

Manufacturer Part Number

sx8644

Description

Ultra Low Power, Capacitive Button And Slider Touch Controller 12 Sensors With Enhanced Led Drivers

Manufacturer

Semtech Corporation

Datasheet

1.SX8644.pdf (76 pages)

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Quantity

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Company:

Meier Automation Equipment Co., Limited

Part Number:

sx8644I05AWLTRT

Manufacturer:

SEMTECHCORPORATION

Quantity:

20 000

Company:

H&T Electronics

Part Number:

sx8644I05AWLTRT

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ADVANCED COMMUNICATIONS & SENSING

The SX8644 is an ultra low power, fully integrated

12-channel solution for capacitive touch-buttons and

slider applications. Unlike many capacitive touch

solutions, the SX8644 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 SX8644 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 SX8644 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 SX8644 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.

Revision 7_3, January 10

YPICAL

ENERAL

PPLICATION CIRCUIT

ESCRIPTION

multi-time

programmable

Touch Controller (12 sensors) with Enhanced LED Drivers

memory

* This device is RoHS/WEEE compliant and Halogen Free

SX8644I05AWLTRT

Ultra Low Power, Capacitive Button and Slider

3000 Units/reel

PPLICATIONS

RDERING

Complete 12 Sensors Capacitive Touch Controller for

Buttons and Slider

High Resolution Capacitive Sensing

Extremely Low Power Optimized for Portable Application

Programmable Scanning Period from 15ms to 1500ms

Auto Offset Compensation

Multi-Time In-Field Programmable Firmware Parameters

for Ultimate Flexibility

"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

Notebook/Netbook/Portable/Handheld computers

Cell phones, PDAs

Consumer Products, Instrumentation, Automotive

Mechanical Button Replacement

Part Number

Pre-configured for 6 Buttons and a Slider

8 LED Drivers with Individual Intensity, Fading Control

and Autolight Mode

256 steps PWM Linear and Logarithmic control

Up to 100pF of Offset Capacitance Compensation at

Full Sensitivity

Capable of Sensing through Overlay Materials up to

5mm thick

8uA (typ) in Sleep Mode

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

220uA (typ) in Active Mode (Scanning Period 30ms)

Eliminates False Triggers due to Environmental

Factors (Temperature, Humidity)

Initiated on Power-up and Configurable Intervals

On-chip user programmable memory for fast, self

contained start-up

RODUCT

NFORMATION

EATURES

-40°C to +85°C Lead Free MLPQ-W32

Temperature

Range

DATASHEET

www.semtech.com

Package

SX8644

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