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SX8675 Datasheet Preview

SX8675 Datasheet

Haptics Enabled Multitouch 4/5-Wire Resistive Touchscreen Controller

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SX8674/SX8675/SX8676
Haptics Enabled Multitouch 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
ADVANCED COMMUNICATIONS & SENSING
GENERAL DESCRIPTION
The SX8674, SX8675 and SX8676 belong to a family
of high performance haptics enabled multitouch 4/5-
wire resistive touch screen controller with proximity
detection, optimized for hand held applications such
as mobile phones, portable music players, game
machines, point-of-sales terminal and other
consumer and industrial applications. They feature a
wide input supply range from 2.3V to 3.6V.
The controller computes touch screen X-Y
coordinates and touch pressure with a precision, low
power 12-bit analog-digital converter. On-chip data
averaging processing algorithms can be activated to
reduce host activity and suppress system noise. The
processing core features low power modes which
intelligently minimize current in operation as well as in
automatic shut-down.
Multitouch feature enables detection of 2 fingers on
the touchscreen and several gestures like rotation
and pinch/stretch.
A capacitive proximity detection circuit has been
integrated into the SX8674 and SX8676 to enable
host controlled power management for battery
applications. Proximity detection above 5 cm is
possible using either the resistive touch screen as the
sensor or with a single conductive plate, with
communication to the host via the serial interface.
The SX8674 and SX8675 also integrate a haptics
motor driver for Linear Resonant Actuator (LRA) and
Eccentric Rotating Mass (ERM) micro motors with up
to 250mA drive current. Haptics control can be
performed using either an external PWM signal or the
I2C serial interface, providing simple host interfacing
and minimizing its I/O requirement.
Integrated very high ESD protection, of up to ±15kV
on display inputs not only saves cost and board area,
but also increases application reliability.
The three devices have an ambient operating
temperature range of -40°C to +85°C, and are offere d
in both a 4mm x 4mm, 20-lead QFN package and
2.07mm x 2.07mm 19-lead CSP package for space-
conscious applications.
KEY PRODUCT FEATURES
Low Voltage Operation
2.3V to 3.6V Supply
Integrated Low Drop Out (LDO) Regulator
Low Power Consumption
30uA@2.3V 8ksps (ESR)
0.4uA Shut-Down Current
4/5-Wire Touchscreen Interface
Precision, Ratiometric 12-bit ADC
Up to 5000 (X-Y) coordinates/second (c/s)
Programmable Digital Filtering/Averaging
Touch Pressure Measurement (4-Wire)
Programmable Operating Mode (Manual,
Pen Detect, Pen Trigger)
Capacitive Proximity Sensing (SX8674/76)
No Additional Components Required
Uses Resistive Touchscreen or a Simple
Conductive Area as the Sensor
>5 cm Detection Distance
8uA @ 200ms Scan Period
Fully Programmable (Sensitivity, etc)
Haptics Driver for LRA and ERM (SX8674/75)
Haptics Waveform Generation Control (I2C
or PWM Input)
Short Circuit Protection
Early Warning and Over-Temperature
Monitoring and Protection
400kHz I2C Serial Interface
Several Host Operating Modes Available
Maskable Interrupt Output (NIRQ)
Real-time Events Monitoring (AUX1-3)
Polling (I2C)
Hardware, Software, and Power-On Reset
-40°C to +85°C Operating Temperature Range
15kV HBM & IEC ESD Protection
Small Footprint Packages
Pb & Halogen Free, RoHS/WEEE compliant
TYPICAL APPLICATIONS
Game Machines, Portable Music Players
Mobile Phones
DSC, DVR, Phones
POS/POI Terminals
Touch-Screen Monitors
ORDERING INFORMATION
Part Number
Package
SX8674IWLTRT
QFN-20
SX8674ICSTRT
WLCSP-19
SX8675IWLTRT
QFN-20
SX8675ICSTRT
WLCSP-19
SX8676IWLTRT
QFN-20
SX8676ICSTRT
WLCSP-19
SX8674EVK
Evaluation Kit
Rev 1 – 25th July 2011
Marking
RA39
RF9E
RKL9
-
M
HAPTICS DRIVER
MULTITOUCH
CONTROL
PROXIMITY SENSING
1
SX8674
NRST
Host
I2C
Controller
NIRQ
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Semtech

SX8675 Datasheet Preview

SX8675 Datasheet

Haptics Enabled Multitouch 4/5-Wire Resistive Touchscreen Controller

No Preview Available !

SX8674/SX8675/SX8676
Haptics Enabled Multitouch 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
ADVANCED COMMUNICATIONS & SENSING
Table of Contents
GENERAL DESCRIPTION ..................................................................................................................... 1
TYPICAL APPLICATIONS ..................................................................................................................... 1
ORDERING INFORMATION................................................................................................................... 1
KEY PRODUCT FEATURES.................................................................................................................. 1
1 GENERAL DESCRIPTION ............................................................................................................ 4
1.1 Marking Information
1.1.1 SX8674
1.1.2 SX8675
1.1.3 SX8676
1.2 Pin Diagrams
1.2.1 QFN Package
1.2.2 CSP Package
1.3 Pin Description
1.4 Block Diagram
4
4
4
4
5
5
5
6
7
2 ELECTRICAL CHARACTERISTICS............................................................................................... 9
2.1 Absolute Maximum Ratings
2.2 Thermal Characteristics
2.3 Electrical Specifications
9
9
9
3 TYPICAL OPERATING CHARACTERISTICS ............................................................................... 12
4 TOUCHSCREEN INTERFACE..................................................................................................... 13
4.1 Introduction
4.2 Coordinates Measurement
4.2.1 4-wire Touchscreen
4.2.2 5-wire Touchscreen
4.3 Pressure Measurement (4-wire only)
4.3.1 Bias Time (POWDLY)
4.4 Pen Detection
4.5 Multitouch Measurement (4-wire only)
4.6 Digital Processing
4.7 Host Operation
4.7.1 Overview
4.7.2 Manual Mode (MAN)
4.7.3 Pen Detect Mode (PENDET)
4.7.4 Pen Trigger Mode (PENTRG)
4.7.5 Maximum Throughput vs. TOUCHRATE setting
13
14
14
15
15
16
16
17
18
19
19
19
21
21
22
5 PROXIMITY SENSING INTERFACE (SX8674/76) ....................................................................... 24
5.1 Introduction
5.2 Analog Front-End (AFE)
5.2.1 Capacitive Sensing Basics
5.2.2 AFE Block Diagram
5.2.3 Capacitance-to-Voltage Conversion (C-to-V)
5.2.4 Shield Control
5.2.5 Offset Compensation
5.2.6 Analog-to-Digital Conversion (ADC)
5.3 Digital Processing
5.3.1 Overview
5.3.2 PROXRAW Update
5.3.3 PROXUSEFUL Update
24
25
25
26
27
27
27
28
28
28
29
30
Rev 1 – 25th July 2011
2
www.semtech.com


Part Number SX8675
Description Haptics Enabled Multitouch 4/5-Wire Resistive Touchscreen Controller
Maker Semtech
Total Page 30 Pages
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