MAX1234EVC16【PDF 1/44 页】EV SYSTEM/EV KIT MAX1233/MAX1234

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19-2512; Rev 4; 3/08

ATION

EVALU

AVAILA

KIT

BLE

±15kV ESD-Protected Touch-Screen

Controllers Include DAC and Keypad Controller

General Description

The MAX1233/MAX1234 are complete PDA controllers in

5mm × 5mm, 28-pin QFN and TQFN packages. They fea-

ture a 12-bit analog-to-digital converter (ADC), low on-

resistance switches for driving resistive touch screens, an

internal +1.0V/+2.5V or external reference, ± 2°C accu-

rate, on-chip temperature sensor, direct +6V battery mon-

itor, keypad controller, 8-bit digital-to-analog converter

(DAC), and a synchronous serial interface. Each of the

keypad controllers’ eight row and column inputs can be

reconfigured as general-purpose parallel I/O pins (GPIO).

All analog inputs are fully ESD protected, eliminating the

need for external TransZorb ? devices.

The MAX1233/MAX1234 offer programmable resolution

and sampling rates. Interrupts from the devices alert the

host processor when data is ready, when the screen is

touched, or a key press is detected. Software-

configurable scan control and internal timers give the user

flexibility without burdening the host processor. These

devices consume only 260μA at the maximum sampling

rate of 50ksps. Supply current falls to below 50μA for

sampling rates of 10ksps. The MAX1233/MAX1234 are

guaranteed over the -40 ° C to +85 ° C temperature range.

Applications

Personal Digital Assistants

Pagers

Touch-Screen Monitors

Cellular Phones

MP3 Players

Portable Instruments

Point-of-Sale Terminals

Pin Configuration

TOP VIEW

Features

? ESD-Protected Analog Inputs

± 15kV IEC 1000-4-2 Air-Gap Discharge

± 8kV IEC 1000-4-2 Contact Discharge

? Single-Supply Operation

+2.7V to +3.6V (MAX1233)

+4.75V to +5.25V (MAX1234)

? 4-Wire Touch-Screen Interface

? Internal +1.0V/+2.5V Reference or External

Reference (+1.0V to AV DD )

? SPI ? /QSPI ? /MICROWIRE ? -Compatible 10MHz

Serial Interface

? 12-Bit, 50ksps ADC Measures

Resistive Touch-Screen Position and Pressure

Two Auxiliary Analog Inputs

Two Battery Voltages (0.5V to 6V)

On-Chip Temperature

? 8-Bit DAC for LCD Bias Control

? 4 × 4 Keypad Programmable Controller Offers Up

to Eight GPIO Pins

? Automatic Detection of Screen Touch, Key Press,

and End of Conversion

? Programmable 8-, 10-, 12-Bit Resolution

? Programmable Conversion Rates

? AutoShutdown ? Between Conversions

? Low Power

260μA at 50ksps

50μA at 10ksps

6μA at 1ksps

0.3μA Shutdown Current

? 28-Pin 5mm × 5mm QFN and TQFN Packages

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

DV DD

AV DD

*X+

MAX1233 EGI

MAX1233ETI

-40°C to +85°C

28 QFN (5mm x 5mm)

28 TQFN (5mm x 5mm)

*Y+

*X-

*Y-

MAX1233

MAX1234

MAX1234 EGI

MAX1234ETI

-40°C to +85°C

28 QFN (5mm x 5mm)

28 TQFN (5mm x 5mm)

GND

TransZorb is a trademark of General Semiconductor Industries, Inc.

SPI and QSPI are trademarks of Motorola, Inc.

QFN/TQFN

*PIN INCLUDES 8kV/15kV ESD PROTECTION.

MICROWIRE is a trademark of National Semiconductor Corp.

AutoShutdown is a trademark of Maxim Integrated Products, Inc.

________________________________________________________________ Maxim Integrated Products

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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