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PDF MAX1233 Data sheet ( Hoja de datos )
| Número de pieza | MAX1233 | |
| Descripción | ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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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.
1 page  
±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
ELECTRICAL CHARACTERISTICS (continued)
(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
Input Capacitance
DIGITAL OUTPUT (DOUT)
CIN
15 pF
Output Voltage Low
VOL ISINK = 2mA
ISINK = 4mA
0.4
V
0.8
Output Voltage High
VOH
ISOURCE = 1.5mA
DIGITAL OUTPUT (BUSY, PENIRQ, KEYIRQ, R_, C_)
DVDD -
0.5
V
Output Voltage Low
VOL ISINK = 0.2mA
0.4 V
Output Voltage High
VOH
ISOURCE = 0.2mA
DVDD -
0.5
V
POWER REQUIREMENTS
Supply Voltage (Note 12)
AVDD /
DVDD
MAX1233
MAX1234
Idle; all blocks shut down
2.7 3 3.6
4.75 5 5.25
0.5 5
V
Analog and Digital Supply
Current
IAVDD +
IDVDD
Only ADC on; fSAMPLE = 20ksps
Only DAC on; no load
Only internal reference on
150 500
150 230
670 900
µA
TIMING CHARACTERISTICS
SCLK Clock Period
SCLK Pulse Width High
SCLK Pulse Width Low
DIN to SCLK Rise Setup
SCLK Rise to DIN Hold
SCLK Fall to DOUT Valid
CS Fall to DOUT Enabled
CS Rise to DOUT Disabled
CS Fall to SCLK Rise
CS Fall to SCLK Ignored
SCLK Rise to R_/C_ Data Valid
CS Pulse Width High
tCP
tCH
tCL
tDS
tDH
tDOV
tDV
tDOD
tCSS
tCSH
tGPO
tCSW
CLOAD = 50pF
CLOAD = 50pF
CLOAD = 50pF
CLOAD = 50pF (Note 13)
100 ns
40 ns
40 ns
40 ns
0 ns
40 ns
45 ns
40 ns
40 ns
0 ns
230 ns
40 ns
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Tested at DVDD = AVDD = +2.7V (MAX1233), DVDD = AVDD = +5V (MAX1234).
Relative accuracy is the deviation of the analog value at any code from its theoretical value after the offset and gain errors
have been removed.
Offset nulled.
Difference between TEMP1 and TEMP2; temperature in °K = (VTEMP2 - VTEMP1) × 2680°K/V. No calibration is necessary.
Temperature coefficient is -2.1mV/°C. Determine absolute temperature by extrapolating from a calibrated value.
ADC performance is limited by the conversion noise floor, typically 300µVP-P. An external reference below 2.5V can
compromise the ADC performance.
Guaranteed from code 5 to 255.
_______________________________________________________________________________________ 5
5 Page 
±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
Typical Operating Characteristics (continued)
(AVDD = DVDD = 3V (MAX1233) or 5V (MAX1234), external VREF = +2.5V (MAX1233), external VREF = +4.096V (MAX1234), fSCLK =
10MHz (50% duty cycle), fSAMPLE = 20ksps, CLOAD = 50pF, 0.1µF capacitor at REF, TA = +25°C, unless otherwise noted.)
ADC REFERENCE SUPPLY CURRENT
vs. ANALOG SUPPLY VOLTAGE
750
REFERENCE SUPPLY CURRENT
vs. TEMPERATURE
750
700 700
650 650
600 600
550
2.7 3.2 3.7 4.2 4.7 5.2
AVDD (V)
550
-40 -25 -10 5 20 35 50
TEMPERATURE (°C)
65 80
Pin Description
PIN NAME
FUNCTION
1
DVDD
Positive Digital Supply Voltage, +2.7V to +3.6V for MAX1233, +4.75V to +5.25V for MAX1234. Bypass
with a 0.1µF capacitor. Must be within 300mV of AVDD.
2
AVDD
Positive Analog Supply Voltage, +2.7V to +3.6V for MAX1233, +4.75V to +5.25V for MAX1234.
Bypass with a 0.1µF capacitor. Must be within 300mV of DVDD.
3* X+ X+ Position Input
4* Y+ Y+ Position Input
5* X- X- Position Input
6* Y- Y- Position Input
7
GND
Analog and Digital Ground
8* BAT1 Battery Monitoring Input 1. Measures battery voltages up to 6V.
9* BAT2 Battery Monitoring Input 2. Measures battery voltages up to 6V.
10* AUX1 Auxiliary Analog Input 1 to ADC. Measures analog voltages from zero to VREF.
11* AUX2 Auxiliary Analog Input 2 to ADC. Measures analog voltages from zero to VREF.
Voltage Reference Output/Input. Reference voltage for analog-to-digital conversion. In internal
12 REF reference mode, the reference buffer provides a 2.5V or 1.0V nominal output. In external reference
mode, apply a reference voltage between 1.0V and AVDD. Bypass REF to GND with a 0.1µF
capacitor in the external reference mode only.
13 DACOUT DAC Voltage Output; 0.9 × AVDD Full Scale
14 R4 Keypad Row 4. Can be reconfigured as GPIO3.
15 R3 Keypad Row 3. Can be reconfigured as GPIO2.
16 R2 Keypad Row 2. Can be reconfigured as GPIO1.
17 R1 Keypad Row 1. Can be reconfigured as GPIO0.
18 C1 Keypad Column 1. Can be reconfigured as GPIO4.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX1233.PDF ] | |
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