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MAX1234 Datasheet

  • MAX1234

  • ?à15kV ESD-Protected Touch- Screen Controllers Include DAC ...

  • Maxim   Maxim

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19-2512; Rev 0; 7/02
鹵15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
General Description
The MAX1233/MAX1234 are complete PDA controllers in
a 5mm
脳
5mm, 28-pin QFN package. They feature a
12-bit analog-to-digital converter (ADC), low on-resis-
tance switches for driving resistive touch screens, an
internal +1.0V/+2.5V or external reference,
鹵2擄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鈥?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
鈩?/div>
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 260碌A at the maximum sampling
rate of 50ksps. Supply current falls to below 50碌A for
sampling rates of 10ksps. The MAX1233/MAX1234 are
guaranteed over the -40擄C to +85擄C temperature range.
IT
TION K
VALUA
E
BLE
AVAILA
Features
o
ESD-Protected Analog Inputs
鹵15kV
IEC 1000-4-2 Air-Gap Discharge
鹵8kV
IEC 1000-4-2 Contact Discharge
o
Single-Supply Operation
+2.7V to +3.6V (MAX1233)
+4.75V to +5.25V (MAX1234)
o
4-Wire Touch-Screen Interface
o
Internal +1.0V/+2.5V Reference or External
Reference (+1.0V to AV
DD
)
o
SPI
鈩?/div>
/QSPI
鈩?/div>
/MICROWIRE
鈩?/div>
-Compatible 10MHz
Serial Interface
o
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
o
8-Bit DAC for LCD Bias Control
o
4
脳
4 Keypad Programmable Controller Offers Up
to Eight GPIO Pins
o
Automatic Detection of Screen Touch, Key Press,
and End of Conversion
o
Programmable 8-, 10-, 12-Bit Resolution
o
Programmable Conversion Rates
o
AutoShutdown
鈩?/div>
Between Conversions
o
Low Power
260碌A at 50ksps
50碌A at 10ksps
6碌A at 1ksps
0.3碌A Shutdown Current
o
28-Pin 5mm
脳
5mm QFN Package
MAX1233/MAX1234
Applications
Personal Digital Assistants
Pagers
Touch-Screen Monitors
Cellular Phones
MP3 Players
Portable Instruments
Point-of-Sale Terminals
Pin Configuration
PENIRQ
28
27
26
25
24
DOUT
BUSY
SCLK
TOP VIEW
23
22
KEYIRQ
DIN
CS
DV
DD
AV
DD
*X+
*Y+
*X-
*Y-
GND
1
2
3
4
5
6
7
10
11
12
13
14
8
9
21
20
19
C4
C3
C2
C1
R1
R2
R3
Ordering Information
PART
MAX1233EGI
MAX1234EGI
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PIN-PACKAGE
28 QFN (5mm
脳
5mm)
28 QFN (5mm
脳
5mm)
MAX1233
MAX1234
18
17
16
15
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.
1
DACOUT
*BAT1
*BAT2
*AUX2
*AUX1
REF
QFN
*PIN INCLUDES 8kV/15kV ESD PROTECTION.
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
R4

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