MAX11811 Datasheet, PDF (1/1 Pages) Maxim Integrated Products – TacTouch™, Low-Power, Ultra-Small, Resistive Touch-Screen Controller with Haptic Driver

19-5133; Rev 0; 1/10
TacTouch™, Low-Power, Ultra-Small, Resistive
Touch-Screen Controller with Haptic Driver
General Description
Features
The MAX11811 low-power touch-screen controller oper- S 4-Wire Touch-Screen Interface
ates from a 1.7V to 3.6V single supply targeting power-
sensitive applications such as handheld equipment. The
S X/Y Coordinate Measurement and Touch Pressure
Measurement
device contains a 12-bit SAR ADC and a multiplexer to
interface with a resistive touch-screen panel. A digital
serial interface provides communications.
The MAX11811 includes digital preprocessing of the
touch-screen measurements, reducing bus loading
S Ratiometric Measurement
S 12-Bit SAR ADC
S Single 1.7V to 3.6V Supply
S Two Operating Modes—Direct and Autonomous
and application processor (AP) resource requirements. S ^{Data Tagging Provides Measurement and Touch}
The included smart interrupt function generator greatly
Event Information
reduces the frequency of interrupt servicing to the devic-
es. The MAX11811 enters low-power mode automatically
between conversions to save power, making the device
D ^{ideal for portable applications.}
The MAX11811 offers two modes of operation: direct
and autonomous. Direct mode allows the application
E _{processor to control all touch-screen controller activ-}
ity. Autonomous mode allows the MAX11811 to control
touch-screen activity, thereby freeing the application
G processor to perform other functions. In autonomous
mode, the device periodically scans the touch screen
for a touch event without requiring host processor
ID ^{intervention. This can be used to reduce system power}
consumption. An on-chip FIFO is used during autono-
mous mode to store results and increase effective data
throughput and lower system power.
R The MAX11811 supports data-tagging, which records
the type of measurement performed; X, Y, Z1, or Z2, and
the type of touch event; initial touch, continuing touch, or
B _{touch release.}
The MAX11811 features a haptic driver to either drive a
A ^{vibration motor directly or to interface with an external}
piezo actuator driver. The device generates PWM sig-
S Data Filtering Provides Noise Reduction
S Aperture Mode Provides Spatial Filtering
S Digital Processing Reduces Bus Activity and
Interrupt Generation
S Programmable Touch-Detect Pullup Resistors
S Auto Power-Down Control for Low-Power
Operation
S General-Purpose Current DAC Output
S General-Purpose Input
S Integrated Proximity Sensing System
S Integrated Motor Haptic Driver*
S PWM Output for MAX11835 Haptic Piezo
Controller^† (HPC)
S 400kHz I²C Interface
S 20-Pin, 4mm x 4mm TQFN
S Low-Power Operation
250µW at VDD = 1.7V, 34.4ksps
S ESD Protection
Q8kV HBM (X+, X-, Y+, Y-)
Applications
nals that can drive the MAX11835 haptic piezo control-
ler. The device includes a general-purpose current DAC
output and a general-purpose input that can be used to
drive IR and visible LEDs, as well as IR photo-detectors
Mobile Communication Devices
PDA, GPS Receivers, Personal Navigation
Devices, Media Players
in applications such as proximity detectors.
Digital Still Camera
The MAX11811 supports the I²C serial bus. The
MAX11811ETP+ is available in a 20-pin TQFN package
and is specified over the extended industrial tempera-
ture range of -40NC to +85NC. The MAX11811GTP/V+ is
specified over the -40NC to +105NC automotive tempera-
ture range.
Digital Video Camera
Digital Photo Frame
POS Terminals and Financial Terminals
Handheld Games
Automotive Center Consoles
Ordering Information and Typical Operating Circuits appear
at end of data sheet.
TacTouch is a trademark of Maxim Integrated Products, Inc.
*Use of Haptic technologies in an end product may require
third-party licensing.
†_{Quickview available.}
________________________________________________________________ Maxim Integrated Products   1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.