Rainbow-electronics MAX7359 User Manual download pdf

General Description

The MAX7359 I

C interfaced peripheral provides micro-

processors 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 fur-

ther 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 (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 INT, if not used, can function as a general-pur-

pose output (GPO).

The MAX7359 is offered in a small 24-pin TQFN (3.5mm x

3.5mm) package for cell phones, pocket PCs, and other

portable consumer electronic applications. The MAX7359

operates over the -40°C to +85°C temperature range.

Applications

Cell Phones

PDAs

Handheld Games

Portable Consumer Electronics

Features

♦ 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 I

C Address Choices

♦ Small, 24-Pin TQFN Package (3.5mm x 3.5mm)

MAX7359

2-Wire Interfaced Low-EMI

Key Switch Controller/GPO

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-0850; Rev 0; 7/07

EVALUATION KIT

AVAILABLE

PART

TEMP

RANGE

PIN-PACKAGE

PKG

CODE

MAX7359ETG+

-40°C to

+85°C

24 TQFN-EP*

(3.5mm x 3.5mm)

T243A3-1

Denotes a lead-free package.

EP = Exposed paddle.

MAX7359

COL_

GND

SCL

SDA

AD0

ROW_

SWITCH

ARRAY,

UP TO 64

SWITCHES

INPUT

1.62V TO 3.6V

INT

Typical Application Circuit

Pin Configuration appears at end of data sheet.

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.

1 2 3 4 5 6 ... 21 22

Summary of Contents

Page 1 - Key Switch Controller/GPO

General DescriptionThe MAX7359 I2C interfaced peripheral provides micro-processors with management of up to 64 key switches.Key codes are generated fo

Page 2

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO10 ______________________________________________________________________________________Debo

Page 3

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO______________________________________________________________________________________ 11Inte

Page 4

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO12 ______________________________________________________________________________________REGI

Page 5

Only one autorepeat code is entered into the FIFO, regard-less of the number of keys pressed. The autorepeat codecontinues to be entered in the FIFO a

Page 6

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO14 ______________________________________________________________________________________SDAS

Page 7

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO______________________________________________________________________________________ 15MAX7

Page 8

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO16 ______________________________________________________________________________________SAAP

Page 9

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO______________________________________________________________________________________ 17MAX7

Page 10

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO18 ______________________________________________________________________________________REGU

Page 11

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO______________________________________________________________________________________ 19MAX7

Page 12

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO2 _______________________________________________________________________________________ABSO

Page 13

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO20 ______________________________________________________________________________________Pin

Page 14

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO______________________________________________________________________________________ 21MAX7

Page 15

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPOMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely emb

Page 16

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO_______________________________________________________________________________________ 3I2C

Page 17

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO4 _______________________________________________________________________________________0100

Page 18

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO_______________________________________________________________________________________ 564kH

Page 19

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO6 _______________________________________________________________________________________Deta

Page 20

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO_______________________________________________________________________________________ 7PIN

Page 21

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO8 _______________________________________________________________________________________KEYS

Page 22

MAX73592-Wire Interfaced Low-EMIKey Switch Controller/GPO_______________________________________________________________________________________ 9REGI

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Rainbow-electronics MAX7359 User Manual

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