MAX1233_05 Datasheet, PDF (1/45 Pages) Maxim Integrated Products – ±15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller

19-2512; Rev 3; 8/05
EVAALVUAAILTAIOBNLEKIT
±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
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
TOP VIEW
Ordering Information
DVDD 1
AVDD 2
*X+ 3
*Y+ 4
*X- 5
*Y- 6
GND 7
MAX1233
MAX1234
21 C4
20 C3
19 C2
18 C1
17 R1
16 R2
15 R3
PART
MAX1233EGI
MAX1233ETI
MAX1234EGI
MAX1234ETI
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QFN (5mm x 5mm)
28 TQFN (5mm x 5mm)
28 QFN (5mm x 5mm)
28 TQFN (5mm x 5mm)
QFN/TQFN
*PIN INCLUDES 8kV/15kV ESD PROTECTION.
TransZorb is a trademark of General Semiconductor Industries, Inc.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.