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MAX7359
2-Wire Interfaced Low-EMI Key Switch Controller/GPO

Low-Voltage, Low-EMI, and Low-Supply Current Key-Switch Controller Monitors Up to 64 Keys Without External Components


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 176kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX7359 I²C interfaced peripheral provides microprocessors with management of up to 64 key switches. Key codes are generated for each press and release of a key for easier implementation of multiple key entries. Key inputs are monitored statically, not dynamically, to ensure low-EMI operation. The switches can be metallic or resistive (carbon) with up to 5kΩ of resistance.

The MAX7359 features autosleep and autowake to further minimize the power consumption of the device. The autosleep feature puts the device in a low-power state (1µA typ) after a sleep timeout period. The autowake feature configures the MAX7359 to return to normal operating mode from sleep upon a key press.

The key controller debounces and maintains a FIFO of key-press and release events (including autorepeat, if enabled). An interrupt (active-low INT) output can be configured to alert key presses either as they occur, or at maximum rate.

Any of the column drivers (COL2/PORT2–COL7/PORT7) or the active-low INT, if not used, can function as a general-purpose output (GPO).

The MAX7359 is offered in small, 24-pin TQFN (3.5mm x 3.5mm) and 25-bump WLP (2.31mm x 2.31mm) packages for cell phones, pocket PCs, and other portable consumer electronic applications. The MAX7359 operates over the -40°C to +85°C temperature range.

An evaluation kit is available:  MAX7359EVKIT  

NOTE: This product requires use of the following:

  • MAX7359 EVKIT Software

    Key Features   Applications/Uses
    • Optional Key Release Detection on All Keys
    • Monitor Up to 64 Keys
    • 1.62V to 3.6V Operation
    • Autosleep and Autowake to Minimize Current Consumption
    • Under 1µA Sleep Current
    • FIFO Queues Up to 16 Debounced Key Events
    • Key Debounce Time User Configurable from 9ms to 40ms
    • Low-EMI Design Uses Static Matrix Monitoring
    • Hardware Interrupt at the FIFO Level or at the End of Definable Time Period
    • Up to Seven Open-Drain Logic Outputs Available Capable of Driving LEDs
    • 400kbps, 5.5V-Tolerant, 2-Wire Serial Interface
    • Selectable 2-Wire, Serial-Bus Timeout
    • Four I²C Address Choices
    • Small, 24-Pin TQFN Package (3.5mm x 3.5mm) , or 25-Pin WLP Package (2.31mm x 2.31mm)
    		 

    Diagram
    MAX7359: Typical Application Circuit
    Typical Application Circuit

    Application Notes
  • Application Note 4054: Using the MAX7359 for Multifunctional and Gaming Keys on PDAs/Smartphones: A Programming Guide - MAX7359

    • Evaluation Kits
  • MAX7359EVKIT

    • Design Guides
  • Microcontrollers (PDF)
  • Displays (PDF)
  • Automotive (PDF)
  • Medical (PDF)

    • Reliability Reports
  		• Reliability Report: MAX7359.pdf
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    Software/Models
  		• MAX7359 EVKIT Software

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * 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.


    Devices: 1-7 of 7

    MAX7359 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX7359ETG+  
    		Active TQFN;24 pin;13 mm²
    Outline Drawing: 21-0188 (PDF)
    Land Pattern: 90-0122 (PDF)
    Use pkgcode/variation: T243A3+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX7359ETG+T    
    		Active TQFN;24 pin;13 mm²
    Outline Drawing: 21-0188 (PDF)
    Land Pattern: 90-0122 (PDF)
    Use pkgcode/variation: T243A3+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX7359ETG+TG47    
    		Active TQFN;24 pin;13 mm²
    Outline Drawing: 21-0188 (PDF)
    Land Pattern: 90-0122 (PDF)
    Use pkgcode/variation: T243A3+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX7359BETG+  
    		Active TQFN;24 pin;13 mm²
    Outline Drawing: 21-0188 (PDF)
    Land Pattern: 90-0122 (PDF)
    Use pkgcode/variation: T243A3+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX7359BETG+T    
    		Active TQFN;24 pin;13 mm²
    Outline Drawing: 21-0188 (PDF)
    Land Pattern: 90-0122 (PDF)
    Use pkgcode/variation: T243A3+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX7359ETG+G47    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX7359EWA+T    
    		Active WLP;25 pin;4.7 mm²
    Outline Drawing: 21-0453 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: W252F2+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• New Product Press Release 2007-10-29 
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    Document Ref.: 19-0850; Rev 3; 2009-10-16
    This page last modified: 2009-10-16


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