Revision V1.7/October 2010

©2010 Semtech Corp.

SX8652

www.semtech.com

Page 2

Section

Page

ADVANCED COMMUNICATIONS & SENSING

DATASHEET

Table of contents

1.

General Description ................................................................................................................................................. 4

1.1.

DFN Pinout Diagram and Marking Information (Top View).............................................................................. 4

1.2.

WLCSP Pinout Diagram and Marking Information (Top View) ........................................................................ 4

1.3.

Pin Description................................................................................................................................................. 5

1.4.

Simplified Block Diagram ................................................................................................................................. 5

2.

Electrical Characteristics ......................................................................................................................................... 6

2.1.

Absolute Maximum Ratings ............................................................................................................................. 6

2.2.

Recommended Operating Conditions.............................................................................................................. 6

2.3.

Thermal Characteristics ................................................................................................................................... 6

2.4.

Electrical Specifications ................................................................................................................................... 7

2.5.

Host Interface Specifications ........................................................................................................................... 9

2.6.

Host Interface Timing Waveforms.................................................................................................................... 9

3.

Functional Description ........................................................................................................................................... 10

3.1.

General Introduction ..................................................................................................................................... 10

3.2.

Device Interface and ESD protection ............................................................................................................. 11

3.2.1.

Touchscreen interface............................................................................................................................. 11

3.2.2.

Host Interface and Control Pins .............................................................................................................. 11

4.

4-wire Touch Screen Detailed Description ............................................................................................................ 12

4.1.

Touch Screen Operation ................................................................................................................................ 12

4.2.

Coordinates Measurement............................................................................................................................. 12

4.3.

Pressure Measurement.................................................................................................................................. 13

4.4.

Pen Detection ................................................................................................................................................ 13

5.

5-wire Touch Screen Detailed Description ............................................................................................................ 14

5.1.

Touch Screen Operation ................................................................................................................................ 14

5.2.

Coordinates Measurement............................................................................................................................. 14

5.3.

Pen Detection ................................................................................................................................................ 14

6.

Data Processing .................................................................................................................................................... 15

7.

Power-Up, Reset ................................................................................................................................................... 15

8.

Modes of Operation ............................................................................................................................................... 15

8.1.

MANual Mode ................................................................................................................................................ 16

8.2.

AUTOmatic mode .......................................................................................................................................... 16

8.3.

PENDET Mode .............................................................................................................................................. 17

8.4.

PENTRIG Mode ............................................................................................................................................. 17

9.

Host Interface ........................................................................................................................................................ 19

9.1.

SPI Read/Write Registers .............................................................................................................................. 19

9.2.

SPI Reading Channel Data............................................................................................................................ 19

9.3.

SPI Host Commands ..................................................................................................................................... 20

9.4.

SPI implementation and multiple Read/Write ................................................................................................ 20

9.5.

Invalid Qualified Data ..................................................................................................................................... 21