MAX7370 datasheet(1/37 Pages) MAXIM

Part #	MAX7370

Description	8 x 8 Key-Switch Controller and LED Driver/GPIOs

PDF	37 Pages

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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MAX7370

8 x 8 Key-Switch Controller and LED Driver/GPIOs

with I2C Interface and High Level of ESD Protection

�� Maxim Integrated Products 1

19-5950; Rev 1; 3/12

Typical Operating Circuit

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part,

refer to www.maxim-ic.com/MAX7370.related.

General Description

The MAX7370 I2C-interfaced peripheral provides micro-

processors with management of up to 64 key switches,

with optional GPIO and PWM-controlled LED drivers.

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 IC 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 timeout period. The

autowake feature configures the device to return to

normal operating mode from sleep upon a keypress.

The key controller debounces and maintains a FIFO

buffer of keypress and release events (including auto-

repeat, if enabled). An interrupt (INT) output can be

configured to alert keypresses, as they occur, or at the

maximum rate.

The same index rows and columns in the device can be

used as a direct logic-level translator.

If the device is not used for key-switch control, all

keyboard pins can be used as GPIOs. Each GPIO can

be programmed to one of the two externally applied

logic voltage levels. Four column ports (COL7–COL4)

can also be configured as LED drivers that feature

constant-current and PWM intensity control. The maximum

constant-current level for each open-drain LED port is

20mA. The intensity of the LED on each open-drain port

can be individually adjusted through a 256-step PWM

control.

The device is offered in a 24-pin (3.5mm x 3.5mm) TQFN

package with an exposed pad, and small 25-bump

(2.159mm x 2.159mm) wafer-level package (WLP) for

cell phones, pocket PCs, and other portable consumer

electronic applications.

The device operates over the -40°C to +85°C extended

temperature range.

Applications

Cell Phones

Notebooks

PDAs

Handheld Games

Portable Consumer Electronics

Features

S

Monitors Up to 64 Keys

S

Integrated High-ESD Protection

±8kV IEC 61000-4-2 Contact Discharge

±15kV IEC 61000-4-2 Air-Gap Discharge

S

Keyscan Uses Static Matrix Monitoring for

Low-EMI Operation

S

Four LED Driver Pins on COL7–COL4

S

5V Tolerant, Open-Drain I/O Ports Capable of

Constant-Current LED Drive

S

256-Step PWM Individual LED Intensity-Control

Accuracy

S

Individual LED Blink Rates and Common LED

Fade In/Out Rates from 256ms to 4096ms

S

FIFO Queues Up to 16 Debounced Key Events

S

User-Configurable Keypress and Release

Debounce Time (2ms to 32ms)

S

Key-Switch Interrupt (INT) on Each Debounced

Event/FIFO Level, or End-of-Definable Time Period

S

1.62V to 3.6V Operating Supply Voltage

S

Individually Programmable GPIOs to Two Logic

Levels

S

8-Channel Individual Programmable Level

Translators

S

Provides Optional GPIOs on all ROW� and COL�

Pins

S

Supports Hot Insertion

S

400kbps, 5.5V Tolerant I2C Serial Interface with

Selectable Bus Timeout

EVALUATION KIT AVAILABLE

+5V

+1.8V

VCC

+2.6V

VLA

COL[0:3]

32 KEYS

4

ROW[0:7]

8

GND

COL4

COL5

COL6

COL7

I/O

SDA

SCL

AD0

MCU

MAX7370

INT

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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