SX8677 Datasheet, PDF (1/63 Pages) Semtech Corporation – Haptics Enabled Multitouch 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing

SX8677/SX8678
Haptics Enabled Multitouch 4/5-Wire
Resistive Touchscreen Controller with Proximity Sensing
ADVANCED COMMUNICATIONS & SENSING
GENERAL DESCRIPTION
The SX8677 and SX8678 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 SX8677 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 SX8677 and SX8678 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 SX8677/78
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.
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 (SX8677)
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 (SX8677/78)
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
TYPICAL APPLICATIONS
• Game Machines, Portable Music Players
• Mobile Phones
• DSC, DVR, Phones
• POS/POI Terminals
• Touch-Screen Monitors
ORDERING INFORMATION
Part Number
SX8677IWLTRT
SX8677ICSTRT
SX8678IWLTRT
SX8678ICSTRT
SX8674EVK
Package
QFN-20
WLCSP-19
QFN-20
WLCSP-19
Evaluation Kit
Rev 1 – 25^th July 2011
Marking
RNT2
RP9X
-
M
HAPTICS DRIVER
MULTITOUCH
CONTROL
PROXIMITY SENSING
1
SX8677
NRST
Host
I2C
Controller
NIRQ
www.semtech.com