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PDF SX8661 Data sheet ( Hoja de datos )
| Número de pieza | SX8661 | |
| Descripción | Capacitive Button Touch and Proximity Controller | |
| Fabricantes | Semtech | |
| Logotipo |  |
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SX8661
Low Power, Capacitive Button Touch and Proximity Controller
(8 sensors) with LED Drivers and Analog Output
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
GENERAL DESCRIPTION
The SX8661 is an ultra low power, fully integrated 8-
channel solution for capacitive touch-button and
proximity detection applications. Unlike many
capacitive touch solutions, the SX8661 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,
and breathing.
The SX8661 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 SX8661 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 SX8661 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 or Continuous Fading Mode
o 256 steps PWM Linear and Logarithmic control
Proximity Sensing up to several centimetres
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
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 Single 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 (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
LCD TVs, Monitors
White Goods
Notebook/Netbook/Portable/Handheld computers
Consumer Products, Instrumentation, Automotive
Mechanical Button Replacement
ORDERING INFORMATION
Part Number Temperature
Package
Range
SX8661I07AULTRT1 -40°C to +85°C Lead Free MLPQ-UT28
1 3000 Units/reel
* This device is RoHS/WEEE compliant and Halogen Free
Revision v3.2, January 2011
© 2011 Semtech Corp.
1
www.semtech.com
1 page  
SX8661
Low Power, Capacitive Button Touch and Proximity Controller
(8 sensors) with LED Drivers and Analog Output
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
1 GENERAL DESCRIPTION
1.1 Pin Diagram
28 27 26 25 24 23 22
cap1 1
cap2 2
cap3 3
cap4 4
cap5 5
cap6 6
cap7 7
SX8661
21 gnd
20 gpio5
Top View
19 gpio4
18 gpio3
17 gpio2
bottom ground pad
16 gnd
15 gpio1
8 9 10 11 12 13 14
Figure 1 Pinout Diagram
1.2 Marking information
NC5B
yyww
xxxxx
R07
yyww = Date Code
xxxxx = Semtech lot number
R07 = Semtech Code
Figure 2 Marking Information
Revision v3.2, January 2011
© 2011 Semtech Corp.
5
www.semtech.com
5 Page 
SX8661
Low Power, Capacitive Button Touch and Proximity Controller
(8 sensors) with LED Drivers and Analog Output
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Parameter
I2C Timing Specifications (i)
SCL clock frequency
SCL low period
SCL high period
Data setup time
Data hold time
Repeated start setup time
Start condition hold time
Stop condition setup time
Bus free time between stop and start
Input glitch suppression
Symbol
fSCL
tLOW
tHIGH
tSU;DAT
tHD;DAT
tSU;STA
tHD;STA
tSU;STO
tBUF
tSP
Conditions
Min.
Typ. Max.
Unit
400 KHz
1.3 us
0.6 us
100 ns
0 ns
0.6 us
0.6 us
0.6 us
500 us
50 ns
Table 6 I2C Timing Specification
Notes:
(i) All timing specifications, Figure 4 and Figure 5, refer to voltage levels (VIL, VIH, VOL) defined in Table 5.
The interface complies with slave F/S mode as described by NXP: “I2C-bus specification, Rev. 03 - 19 June 2007”
Figure 4 I2C Start and Stop timing
Revision v3.2, January 2011
Figure 5 I2C Data timing
© 2011 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SX8661.PDF ] | |
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