MAX11811 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX11811

TacTouch™, Low-Power, Ultra-Small, Resistive Touch-Screen Controller with Haptic Driver

Maxim Integrated 

19-5133; Rev 0; 1/10

EVAALVUAAILTAIOBNLEKIT

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 S Ratiometric Measurement

interface with a resistive touch-screen panel. A digital

serial interface provides communications.

S 12-Bit SAR ADC

ABRIDGED The MAX11811 includes digital preprocessing of the

touch-screen measurements, reducing bus loading

and application processor (AP) resource requirements.

The included smart interrupt function generator greatly

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

ideal for portable applications.

The MAX11811 offers two modes of operation: direct

and autonomous. Direct mode allows the application

processor to control all touch-screen controller activ-

ity. Autonomous mode allows the MAX11811 to control

touch-screen activity, thereby freeing the application

processor to perform other functions. In autonomous

mode, the device periodically scans the touch screen

for a touch event without requiring host processor

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.

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

touch release.

The MAX11811 features a haptic driver to either drive a

vibration motor directly or to interface with an external

piezo actuator driver. The device generates PWM sig-

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

S Single 1.7V to 3.6V Supply

S Two Operating Modes—Direct and Autonomous

S Data Tagging Provides Measurement and Touch

Event Information

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

Mobile Communication Devices

PDA, GPS Receivers, Personal Navigation

Devices, Media Players

drive IR and visible LEDs, as well as IR photo-detectors

in applications such as proximity detectors.

The MAX11811 supports the I2C serial bus. The

MAX11811ETP+ is available in a 20-pin TQFN package

Digital Still Camera

Digital Video Camera

Digital Photo Frame

and is specified over the extended industrial tempera-

POS Terminals and Financial Terminals

ture range of -40NC to +85NC. The MAX11811GTP/V+ is

specified over the -40NC to +105NC automotive tempera-

ture range.

Handheld Games

Automotive Center Consoles

Ordering Information and Typical Operating Circuits nnm,

nappear 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.

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