MAX7360

I²C-Interfaced Key-Switch Controller and LED Driver/GPIOs with Integrated ESD Protection

Provides 8kV Contact/15kV Air Gap Discharge IEC Standard ESD Protection on All Keys


Please check latest availability status for a specific part variant.

Description

The MAX7360 I²C-interfaced peripheral provides microprocessors with management of up to 64 key switches, with an additional eight LED drivers/GPIOs that feature constant-current, PWM intensity control, and rotary switch control options.

The key-switch drivers interface with metallic or resistive switches with on-resistances up to 5kΩ. Key inputs are monitored statically, not dynamically, to ensure low-EMI operation. The MAX7360 features autosleep and autowake modes 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 MAX7360 to return to normal operating mode from sleep upon a keypress.

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

There are eight open-drain I/O ports, which can be used to drive LEDs. The maximum constant-current level for each open-drain port is 20mA. The intensity of the LED on each open-drain port can be individually adjusted through a 256-step PWM control. An input port pair (PORT6, PORT7) can be configured to accept 2-bit gray code inputs from a rotary switch. In addition, if not used for key-switch control, up to six column pins can be used as general-purpose open-drain outputs (GPOs) for LED drive or logic control.

The MAX7360 is offered in a 40-pin (5mm x 5mm) thin QFN package with an exposed pad, and a small 36-bump wafer level package (WLP) for cell phones, pocket PCs, and other portable consumer electronic applications. The MAX7360 operates over the -40°C to +85°C extended temperature range.


How to Program the MAX7360 Key Switch Controller using the Arduino IDE

MAX7360: Simplfied Block Diagram MAX7360: Simplfied Block Diagram Enlarge+

Key Features

  • Integrated ESD Protection
    • ±8kV IEC 61000-4-2 Contact Discharge
    • ±15kV IEC 61000-4-2 Air-Gap Discharge
  • +14V Tolerant, Open-Drain I/O Ports Capable of Constant-Current LED Drive
  • Rotary Switch-Capable Input Pair (PORT6, PORT7)
  • 256-Step PWM Individual LED Intensity Control
  • Individual LED Blink Rates and Common LED Fade In/Out Rates from 256ms to 4096ms
  • FIFO Queues Up to 16 Debounced Key Events
  • User-Configurable Key Debounce (9ms to 40ms)
  • Keyscan Uses Static Matrix Monitoring for Low EMI Operation
  • +1.62V to +3.6V Operation
  • Monitors Up to 64 Keys
  • Key-Switch Interrupt (Active-Low INTK) on Each Debounced Event/FIFO Level, or End of Definable Time Period
  • Port Interrupt (Active-Low INTI) for Input Ports for Special-Key Functions
  • 400kbps, +5.5V Tolerant 2-Wire Serial Interface with Selectable Bus Timeout
  • Four I²C Address Choices

Applications/Uses

  • Cell Phones
  • Handheld Games
  • Instrumentation
  • PDAs
  • Portable Consumer Electronics
  • Printers
Part NumberInterfaceKeysISUPPLY
(µA)
ISHUTDN
(µA)
Interr. OutKey Scan I2C Slave IDsGPIOVSUPPLY
(V)
Package/PinsBudgetary
Price
maxtyptypSee Notes
MAX7360 Serial 2-Wire 400kbit64351.5Yes48 GPIO1.62 to 3.6
TQFN/40
WLP/36
$3.11 @1k
See All Keyswitch Controllers (4)
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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX7360EVKIT: Evaluation Kit for the MAX7360

Technical Documents

App Note 4666 Using Key-Switch Controllers in Smartphones

Quality and Environmental Data

Product Reliability Reports: MAX7360.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

How to Program the MAX7360 Key Switch Controller using Mbed®

CAD Symbols and Footprints

  • MAX7360ETL+
  • MAX7360ETL+T
  • MAX7360EWX+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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