SX8674 Datasheet, PDF (1/64 Pages) Semtech Corporation – Haptics Enabled Multitouch 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing

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 – 25^th July 2011
Marking
RA39
RF9E
RKL9
-
M
HAPTICS DRIVER
MULTITOUCH
CONTROL
PROXIMITY SENSING
1
SX8674
NRST
Host
I2C
Controller
NIRQ
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