SX8660 Datasheet, PDF (1/75 Pages) Semtech Corporation – Ultra Low Power, Capacitive Button Touch Controller (8 sensors) with Enhanced LED Drivers and Analog Output

SX8660
Ultra Low Power, Capacitive Button Touch Controller
(8 sensors) with Enhanced LED Drivers and Analog Output
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
GENERAL DESCRIPTION
The SX8660 is an ultra low power, fully integrated 8-
channel solution for capacitive touch-button
applications. Unlike many capacitive touch solutions,
the SX8660 features dedicated capacitive sense
inputs (that requires no external components) in
addition to 8 general purpose I/O ports (GPIO). Each
of the 8 on-chip GPIO/LED driver is equipped with
independent PWM source for enhanced visual effect
such as dimming, blinking and breathing.
The SX8660 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 SX8660 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 SX8660 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 8 Sensors Capacitive Touch-Button Solution
o Up to 8 LED Drivers for individual Visual Feedback with
Auto Lightening
o Configurable Single, Repeat, Continuous Fading Mode
o 256 steps PWM Linear and Logarithmic control
 High Resolution Capacitive Sensing
o Up to 100pF of Offset Cap. Compensation at Full
Sensitivity
o Capable of Sensing thru Overlay Materials( <5mm thick)
 Up to 2 Analog Output Interfaces (AOI-A and AOI-B)
o Enable button detection thru host’s ADC
 Support of buzzer for audible feedback
 User-selectable Button Reporting Configuration
o Report First or Report Strongest
 Extremely Low Power
o 8uA (typ) in Sleep Mode
o 70uA (typ) in Doze Mode (195ms)
o 200uA (typ) in Active Mode mode (30ms)
 Programmable Scanning Period from 15ms to several
seconds
 Auto Offset Compensation
o Eliminates false triggers due to environmental factors
(temperature, humidity)
o Initiated on power-up and configurable intervals
 Multi-Time In-Field Programmable Firmware Parameters
for Ultimate Flexibility
o On-chip user programmable memory for fast, self
contained start-up
 No External Components per Sensor Input
 Internal Clock Requires No External Components
 Differential Sensor Sampling for Reduced EMI
 Optional 400 KHz I²C Interface w/ Programmable Address
 -40°C to +85°C Operation
APPLICATIONS
 LCD TVs, Monitors
 White Goods
 Notebook/Netbook/Portable/Handheld computers
 Consumer Products, Instrumentation, Automotive
 Mechanical Button Replacement
ORDERING INFORMATION
Part Number Temperature
Range
Package
SX8660I06AULTRT¹ -40°C to +85°C Lead Free MLPQ-UT28
1 _{3000 Units/reel}
* This device is RoHS/WEEE compliant and Halogen Free
Revision v2.3, June 2010
© 2010 Semtech Corp.
1
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