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PDF SX8660 Data sheet ( Hoja de datos )
| Número de pieza | SX8660 | |
| Descripción | Capacitive Button Touch Controller | |
| Fabricantes | Semtech | |
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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
Package
Range
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
www.semtech.com
1 page  
SX8660
Ultra Low Power, Capacitive Button Touch Controller
(8 sensors) with Enhanced LED Drivers and Analog Output
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
1.3 Pin Description
Number Name
1 CAP1
2 CAP2
3 CAP3
4 CAP4
5 CAP5
6 CAP6
7 CAP7
8 CN
9 CP
10 VDD
11 INTB
12 SCL
13 SDA
14 GPIO0
15 GPIO1
16 GND
17 GPIO2
18 GPIO3
19 GPIO4
20 GPIO5
21 GND
22 GPIO6
23 GPIO7
24 VDIG
25 GND
26 RESETB
27 VANA
28 CAP0
bottom plate GND
Type
Analog
Analog
Analog
Analog
Analog
Analog
Analog
Analog
Analog
Power
Digital Output
Digital Input
Digital Input/Output
Digital Input/Output
Digital Input/Output
Ground
Digital Input/Output
Digital Input/Output
Digital Input/Output
Digital Input/Output
Ground
Digital Input/Output
Digital Input/Output
Analog
Ground
Digital Input
Analog
Analog
Ground
Description
Capacitive Sensor 1
Capacitive Sensor 2
Capacitive Sensor 3
Capacitive Sensor 4
Capacitive Sensor 5
Capacitive Sensor 6
Capacitive Sensor 7
Integration Capacitor, negative terminal (1nF between CN and CP)
Integration Capacitor, positive terminal (1nF between CN and CP)
Main input power supply
Interrupt, active LOW, requires pull up resistor (in host or external)
I2C Clock, requires pull up resistor (in host or external)
I2C Data, requires pull up resistor (in host or external)
General Purpose Input/Output 0
General Purpose Input/Output 1
Ground
General Purpose Input/Output 2
General Purpose Input/Output 3
General Purpose Input/Output 4
General Purpose Input/Output 5
Ground
General Purpose Input/Output 6
General Purpose Input/Output 7
Digital Core Decoupling, connect to a 100nF decoupling capacitor
Ground
Active Low Reset. Connect to VDD if not used.
Analog Core Decoupling, connect to a 100nF decoupling capacitor
Capacitive Sensor 0
Exposed pad connect to ground
Table 1 Pin description
Revision v2.3, June 2010
© 2010 Semtech Corp.
5
www.semtech.com
5 Page 
SX8660
Ultra Low Power, Capacitive Button Touch Controller
(8 sensors) with Enhanced LED Drivers and Analog Output
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
3.2 Introduction
3.2.1 General
The SX8660 is intended to be used in applications which require capacitive sensors covered by isolating overlay
material. A finger approaching the capacitive sensors will change the charge that can be loaded on the sensors.
The SX8660 measures the change of charge and converts that into digital values (ticks). The larger the charge on
the sensors, the larger the number of ticks will be. The charge to ticks conversion is done by the SX8660 Analog
Sensor Interface (ASI).
The ticks are further processed by the SX8660 and converted in a high level, easy to use information for the
user’s host.
The information between SX8660 and the user’s host is passed through the I2C interface with an additional
interrupt signal indicating that the SX8660 has new information. For buttons this information is simply touched or
released. The SX8660 can operate without the I2C and interrupt by using the analog output interface (GPIO7
and/or GPIO6) which voltage level indicates the button touched or GPO with the autolight function.
3.2.2 GPIOs
Feedback to the user is using General Purpose Input Output (GPIO) pins. The SX8660 offers up to eight
individual configurable GPIO pins. The GPIO can e.g. be set as a LED driver which slowly fade-in when a finger
touches a button and slowly fade-out when the button is released. Fading intensity variations can be logarithmic
or linear. Interval speed and initial and final light intensity can be selected by the user. The fading is done using a
256 step PWM. The SX8660 has eight individual PWM generators, one for each GPIO pin.
The LED fading-in and fading-out mode is called the GPO (fading) mode.
The LED fading can be initiated automatically by the SX8660 by setting the SX8660 autolightening feature. A
simple touch on a sensor and the corresponding LED will fade-in without any host interaction over the I2C.
In case the autolightening feature is disabled then the host will decide to start a LED fading-in period, simply by
setting the GPO pin to ‘high’ using one I2C command. The SX8660 will then slowly fade-in the LED using the
PWM autonomously.
In case the host needs to have full control of the LED intensity then the host can set the GPIO in the PWM mode
(GPP). The host is then able to set the PWM pulse width freely at the expense of an increased I2C occupation.
The GPIOs can be set further in standard Input mode (GPI) and special purpose output (SPO) for buzzer or
analog output interface.
3.2.3 Analog Output Interface A and B (SPO mode)
The Analog Output Interface (AOI) is a PWM output signal between ground and VDD. The duty cycle of the AOI
output will change depending on which button is touched. A host controller can then measure the mean voltage
delivered on the AOI output as a means of detecting which button is touched at any given time.
The AOI feature allows the SX8660 device to directly replace legacy mechanical button controllers in a quick and
effortless manner. The SX8660 supports up to two Analog Output Interfaces, AOI-A and AOI-B, on GPIO7 and
GPIO6 respectively. The SX8660 allows buttons to be mapped on either AOI-A or AOI-B. The button mapping as
well as the mean voltage level that each button produces on a AOI output can be configured by the user through a
set of parameters described in later chapters (see 5.5).
3.2.4 Buzzer (SPO mode)
The SX8660 can drive a buzzer, on GPIO5, to provide audible feedback on button touches. The buzzer duration
is set to approximately 30ms per default (5.6).
3.2.5 Parameters
The SX8660 has many low level built-in, fixed algorithms and procedures. To allow a lot of freedom for the user
and adapt the SX8660 for different applications these algorithms and procedures can be configured with a large
set of parameters which will be described in the following sections. Examples of parameters are which sensors
Revision v2.3, June 2010
© 2010 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SX8660.PDF ] | |
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