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SX8643 Datasheet(PDF) 2 Page - Semtech Corporation

Part # SX8643
Description  Ultra Low Power, Capacitive Button Touch Controller (12 sensors) with Enhanced LED Drivers
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SX8643 Datasheet(HTML) 2 Page - Semtech Corporation

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ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Revision 7_5, February 10
© 2010 Semtech Corp.
www.semtech.com
2
SX8643
Ultra Low Power, Capacitive Button Touch Controller
(12 sensors) with Enhanced LED Drivers
Table of Contents
GENERAL DESCRIPTION........................................................................................................................ 1
TYPICAL APPLICATION CIRCUIT ............................................................................................................ 1
KEY PRODUCT FEATURES..................................................................................................................... 1
APPLICATIONS....................................................................................................................................... 1
ORDERING INFORMATION...................................................................................................................... 1
1
GENERAL DESCRIPTION............................................................................................................... 4
1.1
Pin Diagram
4
1.2
Marking information
4
1.3
Pin Description
5
1.4
Simplified Block Diagram
6
1.5
Acronyms
6
2
ELECTRICAL CHARACTERISTICS ................................................................................................. 7
2.1
Absolute Maximum Ratings
7
2.2
Recommended Operating Conditions
7
2.3
Thermal Characteristics
7
2.4
Electrical Specifications
8
3
FUNCTIONAL DESCRIPTION........................................................................................................ 10
3.1
Quickstart Application
10
3.2
Introduction
10
3.2.1
General
10
3.2.2
GPIOs
11
3.2.3
Parameters
11
3.2.4
Configuration
11
3.3
Scan Period
12
3.4
Operation modes
12
3.5
Sensors on the PCB
14
3.6
Button Information
14
3.6.1
Button Information
14
3.7
Analog Sensing Interface
14
3.8
Offset Compensation
15
3.9
Processing
17
3.10
Configuration
17
3.11
Power Management
19
3.12
Clock Circuitry
19
3.13
I2C interface
19
3.14
Reset
20
3.14.1
Power up
20
3.14.2
RESETB
20
3.14.3
Software Reset
21
3.15
Interrupt
22
3.15.1
Power up
22
3.15.2
Assertion
22
3.15.3
Clearing
22
3.15.4
Example
23


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