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PDF SX8662 Data sheet ( Hoja de datos )
| Número de pieza | SX8662 | |
| Descripción | Capacitive Button Matrix (up to 36) Controller | |
| Fabricantes | Semtech | |
| Logotipo |  |
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SX8662
Capacitive Button Matrix (up to 36) Controller
with Individual LED Drivers and Buzzer Output
ADVANCED COMMUNICATIONS & SENSING
GENERAL DESCRIPTION
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 GPIO/LED driver is equipped with
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 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 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.
TYPICAL APPLICATION CIRCUIT
36 Capacitive Matrix Buttons
cap11
cap9
cap7
cap6
cap5
cap4
cap0
cap1
cap2
cap3
cap4
cap5
analog sensor
interface
cap6
cap7
cap8
cap9
cap10
buzzer
clock
generation
RC
SX8662
PWM LED
controller
gnd
gpio6
power management
gpio5
gpio4
micro processor
RAM
ROM
GPIO controller
NVM
I2C
gpio3
gpio2
gpio1
gpio0
bottom plate
HOST
KEY PRODUCT FEATURES
Complete Capacitive Touch-Button Solution
o Up to 36 Matrix Buttons
o Up to 36 LEDs Control for individual Visual Feedback
with Auto Lightening
o Configurable Single or 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 up thru 5mm thick Overlay Materials
Support of buzzer for audible feedback
User-selectable Button Reporting Configuration
Extremely Low Power
o 8uA (typ) in Sleep Mode
o 100uA (typ) in Doze Mode (195ms)
o 460uA (typ) in Active 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 with Programmable Address
-40°C to +85°C Operation
APPLICATIONS
Home Automation
White Goods
Printers
Notebook/Netbook/Portable/Handheld computers
Consumer Products, Instrumentation, Automotive
Mechanical Button Replacement
ORDERING INFORMATION
Part Number Temperature
Range
Package
SX8662I08AWLTRT1 -40°C to +85°C Lead Free MLPQ-W32
1 3000 Units/reel
* This device is RoHS/WEEE compliant and Halogen Free
Rev5 4th August 2011
© 2011 Semtech Corp.
1
www.semtech.com
1 page  
SX8662
Capacitive Button Matrix (up to 36) Controller
with Individual LED Drivers and Buzzer Output
ADVANCED COMMUNICATIONS & SENSING
1.3 Pin Description
Number Name
1 CAP2
2 CAP3
3 CAP4
4 CAP5
5 CAP6
6 CAP7
7 CAP8
8 CAP9
9 CAP10
10 CAP11
11 CN
12 CP
13 VDD
14 INTB
15 SCL
16 SDA
17 GPIO0
18 GPIO1
19 GND
20 GPIO2
21 GPIO3
22 GPIO4
23 GPIO5
24 GND
25 GPIO6
26 GPIO7
27 VDIG
28 GND
29 RESETB
30 VANA
31 CAP0
32 CAP1
Bottom Plate GND
Type
Description
Analog
Analog
Analog
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
Analog
Capacitive Sensor 2
Capacitive Sensor 3
Capacitive Sensor 4
Capacitive Sensor 5
Capacitive Sensor 6
Capacitive Sensor 7
Capacitive Sensor 8
Capacitive Sensor 9
Capacitive Sensor 10
Capacitive Sensor 11
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 (on host or external)
I2C Clock, requires pull up resistor (on host or external)
I2C Data, requires pull up resistor (on 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
Capacitive Sensor 1
Ground
Exposed pad connect to ground
Table 1 Pin description
Rev5 4th August 2011
© 2011 Semtech Corp.
5
www.semtech.com
5 Page 
SX8662
Capacitive Button Matrix (up to 36) Controller
with Individual LED Drivers and Buzzer Output
ADVANCED COMMUNICATIONS & SENSING
Figure 6 Scan Period
The scan period determines the minimum reaction time of the SX8662. The scan period can be configured by the
host from 15ms to values larger than a second.
The reaction time is defined as the interval between a touch on the sensor and the moment that the SX8662
generates the interrupt on the INTB pin. The shorter the scan period the faster the reaction time will be.
Very low power consumptions can be obtained by setting very long scan periods with the expense of having
longer reaction times.
All external events like GPIO, I2C and the interrupt are updated in the processing period, so once every scan
period.
3.3 Operation modes
The SX8662 has 3 operation modes. The main difference is found in the reaction time (corresponding to the scan
period) and power consumption.
Active mode offers fast scan periods. The typical reaction time is 30ms. All enabled sensors are scanned and
information data is processed within this interval.
Doze mode increases the scan period time which increases the reaction time to 195ms typical and at the same
time reduces the operating current.
Sleep mode turns the SX8662 OFF, except for the I2C peripheral, minimizing operating current while maintaining
the power supplies. In Sleep mode the SX8662 does not do any sensor scanning. The Sleep mode will be exited
by any I2C access.
The user can specify other scan periods for the Active and Doze mode and decide for other compromises
between reaction time and power consumption.
In most applications the reaction time needs to be fast when fingers are present, but can be slow when no person
uses the application. In case the SX8662 is not used for a specific time it will go from Active mode into Doze
mode and power will be saved. This time-out is determined by the Passive Timer which can be configured by the
user or turned OFF if not required.
To leave Doze mode and enter Active mode this can be done by a simple touch on any button.
The host can decide to force the operating mode by issuing commands over the I2C (using register
CompOpMode) and take fully control of the SX8662. The diagram in Figure 7 shows the available operation
modes and the possible transitions.
Rev5 4th August 2011
© 2011 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SX8662.PDF ] | |
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