MAX1234EGI+

MAX1234EGI+ Datasheet

MAX1233/MAX1234

Part	Datasheet
MAX1234EGI+	MAX1234EGI+ (pdf)

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EVAALVUAAILTAIOBNLEKIT ±15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller MAX1233/MAX1234 The MAX1233/MAX1234 are complete PDA controllers in 5mm x 5mm, 28-pin QFN and TQFN packages. They feature a 12-bit analog-to-digital converter ADC , low onresistance switches for driving resistive touch screens, an internal +1.0V/+2.5V or external reference, ±2°C accurate, on-chip temperature sensor, direct +6V battery monitor, 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. Softwareconfigurable 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. Personal Digital Assistants Pagers Touch-Screen Monitors Cellular Phones MP3 Players Portable Instruments Point-of-Sale Terminals Pin Configuration 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 x 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 x 5mm QFN and TQFN Packages 28 CS 27 SCLK 26 DIN 25 BUSY 24 DOUT 23 PENIRQ 22 KEYIRQ 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 BAT1 8 BAT2 9 AUX1 10 AUX2 11 REF 12 DACOUT 13 R4 14 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 ±15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller MAX1233/MAX1234 ABSOLUTE MAXIMUM RATINGS AVDD to +6V DVDD to AVDD 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 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 Maximum Current into Any 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 CONDITIONS MIN TYP MAX UNITS DC ACCURACY Note 1 Resolution ANALOG-TO-DIGITAL CONVERTER Software-programmable 8/10/12 bit 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 Bits ±2 LSB ppm/°C ppm/°C Channel-to-Channel Gain Matching Noise Power-Supply Rejection Including internal VREF MAX1233 Full-scale AVDD = DVDD = +2.7V to +3.6V input MAX1234 AVDD = DVDD = +5V ±5% 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 MAX1233/MAX1234 ±15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller

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EVAALVUAAILTAIOBNLEKIT
±15kV ESD-Protected Touch-Screen

Controllers Include DAC and Keypad Controller

MAX1233/MAX1234

The MAX1233/MAX1234 are complete PDA controllers in 5mm x 5mm, 28-pin QFN and TQFN packages. They feature a 12-bit analog-to-digital converter ADC , low onresistance switches for driving resistive touch screens, an internal +1.0V/+2.5V or external reference, ±2°C accurate, on-chip temperature sensor, direct +6V battery monitor, 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. Softwareconfigurable 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.

Personal Digital Assistants

Pagers

Touch-Screen Monitors

Cellular Phones

MP3 Players

Portable Instruments

Point-of-Sale Terminals

Pin Configuration

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 x 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 x 5mm QFN and TQFN Packages
28 CS 27 SCLK 26 DIN 25 BUSY 24 DOUT 23 PENIRQ 22 KEYIRQ

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
*BAT1 8 *BAT2 9 *AUX1 10 *AUX2 11

REF 12 DACOUT 13

R4 14

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
±15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller

MAX1233/MAX1234

ABSOLUTE MAXIMUM RATINGS

AVDD to +6V DVDD to AVDD 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 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 Maximum Current into Any

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

CONDITIONS

MIN TYP MAX UNITS

DC ACCURACY Note 1 Resolution

ANALOG-TO-DIGITAL CONVERTER Software-programmable 8/10/12 bit

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

Bits
±2 LSB
ppm/°C
ppm/°C

Channel-to-Channel Gain Matching

Noise Power-Supply Rejection

Including internal VREF

MAX1233

Full-scale AVDD = DVDD = +2.7V to +3.6V
input

MAX1234 AVDD = DVDD = +5V ±5%
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

MAX1233/MAX1234
±15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller

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Datasheet ID: MAX1234EGI+ 647213