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SX8657 Datasheet Preview

SX8657 Datasheet

Haptics Enabled 4/5-Wire Resistive Touchscreen Controller

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SX8657/SX8658
Haptics Enabled 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
ADVANCED COMMUNICATIONS & SENSING
GENERAL DESCRIPTION
The SX8657 and SX8658 belong to a family of high
performance haptics enabled 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.
A capacitive proximity detection circuit has been
integrated into the SX8657 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 SX8657 and SX8658 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. The SX8657/58
supports Immersion TouchSense® 3000 haptic
control software for high quality touch feedback.
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.
TYPICAL APPLICATIONS
Game Machines, Portable Music Players
Mobile Phones
DSC, DVR, Phones
POS/POI Terminals
Touch-Screen Monitors
ORDERING INFORMATION
Part Number
SX8657IWLTRT
SX8657ICSTRT
SX8658IWLTRT
SX8658ICSTRT
SX8654EVK
Package
QFN-20
WLCSP-19
QFN-20
WLCSP-19
Evaluation Kit
Marking
RD2C
RC4B
-
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 (SX8657)
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 (SX8657/58)
Supports Immersion TouchSense® 3000
haptic control software
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
M
HAPTICS DRIVER
TOUCHSCREEN
CONTROL
SX8657
NRST
Host
I2C
Controller
NIRQ
Rev 1 – 25th July 2011
PROXIMITY SENSING
1
www.semtech.com




Semtech

SX8657 Datasheet Preview

SX8657 Datasheet

Haptics Enabled 4/5-Wire Resistive Touchscreen Controller

No Preview Available !

SX8657/SX8658
Haptics Enabled 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 SX8657
1.1.2 SX8658
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
5
5
5
6
6
2 ELECTRICAL CHARACTERISTICS............................................................................................... 8
2.1 Absolute Maximum Ratings
2.2 Thermal Characteristics
2.3 Electrical Specifications
8
8
8
3 TYPICAL OPERATING CHARACTERISTICS ............................................................................... 11
4 TOUCHSCREEN INTERFACE..................................................................................................... 12
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 Digital Processing
4.6 Host Operation
4.6.1 Overview
4.6.2 Manual Mode (MAN)
4.6.3 Pen Detect Mode (PENDET)
4.6.4 Pen Trigger Mode (PENTRG)
4.6.5 Maximum Throughput vs. TOUCHRATE setting
12
13
13
14
14
15
15
16
18
18
18
19
19
20
5 PROXIMITY SENSING INTERFACE (SX8657) ............................................................................ 22
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
5.3.4 PROXAVG Update
5.3.5 PROXDIFF Update
Rev 1 – 25th July 2011
2
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www.semtech.com


Part Number SX8657
Description Haptics Enabled 4/5-Wire Resistive Touchscreen Controller
Maker Semtech
Total Page 30 Pages
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