19-5133; Rev 0; 1/10
TION KIT
EVALUA BLE
AVAILA
TacTouch™, Low-Power, Ultra-Small, Resistive
Touch-Screen Controller with Haptic Driver
General Description
The MAX11811 low-power touch-screen controller oper-
ates from a 1.7V to 3.6V single supply targeting power-
sensitive applications such as handheld equipment. The
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
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.
Features
S
4-Wire Touch-Screen Interface
S
X/Y Coordinate Measurement and Touch Pressure
Measurement
S
Ratiometric Measurement
S
12-Bit SAR ADC
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 I
2
C Interface
S
20-Pin, 4mm x 4mm TQFN
S
Low-Power Operation
250
µ
W at V
DD
= 1.7V, 34.4ksps
S
ESD Protection
Q8kV
HBM (X+, X-, Y+, Y-)
MAX11811
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
drive IR and visible LEDs, as well as IR photo-detectors
in applications such as proximity detectors.
The MAX11811 supports the I
2
C 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.
Ordering Information and Typical Operating Circuits nnm,
nappear at end of data sheet.
AB
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.
RI
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.
DG
†
Quickview
TacTouch is a trademark of Maxim Integrated Products, Inc.
_______________________________________________________________
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.
ED
Digital Still Camera
Digital Video Camera
Digital Photo Frame
Handheld Games
Automotive Center Consoles
available.
Applications
Mobile Communication Devices
PDA, GPS Receivers, Personal Navigation
Devices, Media Players
POS Terminals and Financial Terminals
*Use
of Haptic technologies in an end product may require
third-party licensing.
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