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General Description

The MAX7360 I2C-interfaced peripheral provides micro processors 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 5kI. 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 (1FA typ) after a sleep timeout period. The autowake feature configures the

MAX7360 to return to normal operating mode from sleep upon a keypress.

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 (INTK) on Each Debounced Event/FIFO Level, or End of Definable Time Period

Port Interrupt (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

Cell Phones

PDAs

Handheld Games

Portable Consumer Electronics

Printers

Instrumentation