Semtech

SX8652 Datasheet Preview

SX8652 Datasheet

15kV ESD Low Power 4-Wire / 5-Wire Resistive Touchscreen Controller

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SX8652

15kV ESD Low Power 4-Wire / 5-Wire Resistive

Touchscreen Controller with SPI Interface

ADVANCED COMMUNICATIONS & SENSING

DATASHEET

-----4

GENERAL DESCRIPTION

KEY PRODUCT FEATURES

The SX8652 is a very low power, high reliability controller

for 4-wire and 5-wire resistive touch screens used in PDAs,

portable instruments and point-of-sales terminal

applications. It features a wide input supply range from

1.65V to 3.7V and low power modes to preserve current

when the screen is unintentionally touched.

To compute touch screen X-Y coordinates and touch

pressure with precision, a low power 12-bit analog-digital

converter is activated with the possibility to enable on-chip

data averaging processing algorithms to reduce host activity

and suppress system noise.

The touch screen controller inputs have been specially

designed to provide robust on-chip ESD protection of up to

±15kV in both HBM and Contact Discharge, and eliminates

the need for external protection devices. The SX8652 is

controlled by a high speed SPI™ serial interface.

The SX8652 is available in a 4.0 mm x 3.0 mm 14-DFN

package and a 1.5 mm x 2.0 mm wafer level chip scale

package (WLCSP) for space conscience applications.

APPLICATIONS

DSC, DVR, Cell Phones

PDA, Pagers

Point-of-Sales Terminals

Touch-Screen Monitors

ORDERING INFORMATION

Extremely Low Power Consumption: 23uA@1.8V 8kSPS

Superior On-chip ESD Protection

±15kV HBM (X+,X-,Y+,Y-)

±2kV CDM

±25kV Air Gap Discharge

±15kV Contact Discharge

±300V MM

Single 1.65V to 3.7V Supply/Reference

4-Wire or 5-Wire Resistive Touch Screen Interface

Integrated Preprocessing Block to Reduce Host Loading

and Bus Activity

Four User Programmable Operation Modes provides

Flexibility to address Different Application Needs

Manual, Automatic, Pen Detect, Pen Trigger

Low Noise Ratiometric Conversion

Precision, High Speed 12-bit SAR ADC Operating At 74k

SPS

Throughput: 5000 (X-Y) coordinates/second (c/s) with 7-

Sample Averaging

Low Power Shut-Down Mode < 1uA

SPI™ Serial Interface

Touch Pressure Measurement (4-Wire)

Auxiliary Input (4-Wire) For Alternate ADC Input or Start

of Conversion Trigger

Hardware & Software reset

-40°C to +85°C operation

Part Number

SX8652ICSTRT1

SX8652IWLTRT1

1. 3000 Units / reel

Package (Dimension in mm) Marking

12 - Ball WLCSP (1.5x2.0) FG97

14 - Lead DFN (4.0x 3.0)

FG97

Pb-Free, Halogen Free, RoHS/WEEE compliant product

Windows CE 6.0, Linux Driver Support Available

Packages: 14-LD (4.0 mm x 3.0 mm) DFN

12-Ball (1.5 mm x 2.0 mm) WLCSP

To the

touch

screen

Revision V1.7/October 2010

VDD

AUX/W IPER

X+/BR

Y+/TR

X-/TL

Y-/BL

Touch

Screen

Interface

Vref

C o n tro l

SX8652

VDD

N IR Q

POR

OSC

ref+

in ADC out

ref-

SPI

D ig ita l

Filter

NRST (D FN only)

NCS

SCLK

DOUT

D IN

To the

Host

Page 1

GND

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SX8652 Datasheet Preview

SX8652 Datasheet

15kV ESD Low Power 4-Wire / 5-Wire Resistive Touchscreen Controller

No Preview Available !

SX8652

ADVANCED COMMUNICATIONS & SENSING

Table of contents

Section

DATASHEET

Page

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

Revision V1.7/October 2010

Page 2

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SX8652 Datasheet Preview

SX8652 Datasheet

15kV ESD Low Power 4-Wire / 5-Wire Resistive Touchscreen Controller

SX8652 Datasheet Preview

SX8652 Datasheet

15kV ESD Low Power 4-Wire / 5-Wire Resistive Touchscreen Controller

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