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MAX1233, MAX1234
±15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller
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Status
Active: In Production.
Description
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 on-resistance 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. 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.
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Data Sheet
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An evaluation kit is available: MAX1234EVC16, MAX1234EVKIT
Key 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 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
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Applications/Uses
- Cellular Phones
- MP3 Players
- Pagers
- Personal Digital Assistants
- Point-of-Sale Terminals
- Portable Instruments
- Touch-Screen Monitors
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Key Specifications:
| Touch Interface Products |
| Part Number |
Interface |
Channels |
Touch Pressure Measurement |
Digital I/O Supply Voltage
(V) |
Digital Supply Voltage
(V) |
EV Kit |
Oper. Temp.
(°C) |
Package/Pins |
Budgetary Price |
| min |
max |
See Notes |
| MAX1233 |
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4 |
Yes |
2.7 |
3.6 |
Yes |
-40 to +85 |
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$3.02 @1k |
| MAX1234 |
4.75 |
5.25 |
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$3.02 @1k |
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See All Touch Interface Products (14)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Block Diagram
Application Notes
Product Guides
Reliability Reports
| Reliability Report: |
MAX1233.pdf |
| Show FIT data for: |
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| Request Reliability Report for: |
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Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX1233EGI
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Active |
QFN;28 pin;26 mm²
Outline Drawing:21-0091 (PDF)
Land Pattern: 90-0278 (PDF)
Use pkgcode/variation: G2855-2*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1233EGI-T
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Active |
QFN;28 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX1233ETI+
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Active |
TQFN;28 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0026 (PDF)
Use pkgcode/variation: T2855+6*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1233ETI+T
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Active |
TQFN;28 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0026 (PDF)
Use pkgcode/variation: T2855+6*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1234EGI
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Active |
QFN;28 pin;26 mm²
Outline Drawing:21-0091 (PDF)
Land Pattern: 90-0278 (PDF)
Use pkgcode/variation: G2855-2*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1234EGI-T
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Active |
QFN;28 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX1234ETI+
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Active |
TQFN;28 pin;26 mm²
Outline Drawing:21-0140 (PDF)
Land Pattern: 90-0026 (PDF)
Use pkgcode/variation: T2855+6*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1234ETI+T
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Active |
QFN;28 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Similar Products by Function
| MXB7843 |
2.375V to 5.25V, 4-Wire Touch-Screen Controller |
| MXB7846 |
2.375V to 5.25V, 4-Wire Touch-Screen Controller with Internal Reference and Temperature Sensor |
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More Information
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Information Index
Document Ref.: 19-2512
Rev 4;
2008-04-28
This page last modified: 2009-10-14
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