MAX1233 반도체 회로 부품 판매점
ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller
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 Maxim Integrated |
19-2512; Rev 4; 3/08
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 AVDD)
♦ 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
AVDD
*X+
*Y+
*X-
*Y-
GND
1
2
3
4
5
6
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 Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
ABSOLUTE MAXIMUM RATINGS
AVDD to GND............................................................-0.3V to +6V
DVDD to AVDD .......................................................-0.3V to +0.3V
Digital Inputs/Outputs to GND .................-0.3V to (DVDD + 0.3V)
X+, Y+, X-, Y-, AUX1, AUX2,
and REF to GND ..................................-0.3V to (AVDD + 0.3V)
BAT1, BAT2 to GND .................................................-0.3V to +6V
Maximum ESD per IEC 1000-4-2 (per MIL STD-883 HBM)
X+, X-, Y+, Y-, AUX1, AUX2, BAT1, BAT2......................±15kV
All Other Pins.....................................................................±2.5kV
Maximum Current into Any Pin............................................50mA
Continuous Power Dissipation (TA = +70°C)
28-Pin QFN (derate 28.5mW/°C above +70°C) .................2W
28-Pin TQFN (derate 28.5mW/°C above +70°C) ...............2W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(DVDD = AVDD = +2.7V to +3.6V (MAX1233), DVDD = AVDD = +4.75V to +5.25V (MAX1234), external reference VREF = 2.5V
(MAX1233), VREF = 4.096V (MAX1234); fSCLK = 10MHz, fSAMPLE = 50ksps, 12-bit mode, 0.1µF capacitor at REF, TA = -40°C to
+85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
DC ACCURACY (Note 1)
Resolution
ANALOG-TO-DIGITAL CONVERTER
Software-programmable 8/10/12 bit
12 Bits
No Missing Codes
Relative Accuracy (Note 2)
Differential Nonlinearity
Offset Error
Gain Error (Note 3)
Total Unadjusted Error
Offset Temperature Coefficient
Gain Temperature Coefficient
Channel-to-Channel Offset
12-bit mode
INL
10-bit and 8-bit modes
12-bit mode
DNL
10-bit and 8-bit modes
12-bit mode
10-bit and 8-bit modes
12-bit mode
10-bit mode
8-bit mode
12-bit mode
TUE
10-bit and 8-bit modes
11 Bits
±0.8 ±2
±0.5
LSB
±0.8 ±2
±0.5
LSB
±0.5 ±4
±0.5
LSB
±0.5 ±4
±0.5 LSB
±0.5
±2
LSB
±1
±0.4 ppm/°C
±0.4 ppm/°C
±0.1 LSB
Channel-to-Channel Gain
Matching
±0.1 LSB
Noise
Power-Supply Rejection
Including internal VREF
MAX1233
PSR Full-scale AVDD = DVDD = +2.7V to +3.6V
input
MAX1234
AVDD = DVDD = +5V ±5%
50
±0.4
±0.3
µVRMS
mV
DYNAMIC SPECIFICATIONS (1kHz SINE WAVE, VIN = 2.5VP-P FOR MAX1233, VIN = 4.096VP-P FOR MAX1234, 50ksps,
fSCLK = 10MHz)
Signal-to-Noise Plus Distortion
SINAD
69 dB
2 _______________________________________________________________________________________
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MAX1233 controller
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