MAX7347

更新时间： 2024-11-05 04:41:43

品牌	Logo	应用领域
美信 - MAXIM		开关控制器
页数	文件大小	规格书
29页	348K
描述
2-Wire Interfaced Low-EMI Key Switch and Sounder Controllers

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数据手册

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MAX7347 数据手册

19-3556; Rev 5; 5/07

2-Wire Interfaced Low-EMI Key Switch

and Sounder Controllers

8/MAX7349

General Description

Features

The MAX7347/MAX7348/MAX7349 I²C interfaced periph-

erals provide microprocessors with management of up to

64 key switches. Key inputs are monitored statically, not

dynamically scanned, to ensure low-EMI operation. The

MAX7347 can monitor up to 24 switches, the MAX7348

can monitor up to 40 switches, and the MAX7349 can

monitor up to 64 switches. The switches can be metallic

or resistive (carbon) up to 1kΩ.

♦ 400kbps, 5.5V-Tolerant 2-Wire Serial Interface

♦ 2.4V to 3.6V Operation

♦ Monitor Up to 64 Keys (MAX7349),

40 Keys (MAX7348), or 24 Keys (MAX7347)

♦ FIFO Queues Up to 8 Debounced Key Events

♦ Key Debounce Time User Configurable from 9ms

The key controller debounces and maintains a FIFO of

key-press events (including autorepeat, if enabled). An

interrupt (INT) output can be configured to alert key

presses either as they occur, or at maximum rate.

to 40ms

♦ Key Autorepeat Rate and Delay User Configurable

♦ Low-EMI Design Uses Static Matrix Monitoring

The MAX7348/MAX7349 feature a tone generator to

generate automatic key-click sounds or alarm tones

under processor control.

♦ Hardware Interrupt on Each Debounced Event or

FIFO Level, or at End of Definable Time Period

♦ Up to Six Open-Drain Logic Outputs Available

The sounder frequencies cover the 5th musical octave

(523.25Hz to 987.77Hz), plus seven other musical

notes up to 2637Hz. The output can also be pro-

grammed to be high or low for the sound duration to

operate an electronic sounder, relay, or lamp.

Capable of Driving LEDs

♦ Sounder Output Generates Automatic Key Clicks

♦ 14 Programmable Musical Sounder Frequencies

♦ Continuous or Programmable Sounder Duration

The MAX7347 is offered in 16-pin QSOP and TQFN

packages. The MAX7348 is offered in a 20-pin QSOP

package. The MAX7349 is available in 24-pin QSOP and

TQFN packages. The MAX7347/MAX7348/MAX7349

operate over the -40°C to +125°C temperature range.

♦ Easy Automatic Single-Tone and Dual-Tone Alarm

Sound Generation

♦ Four I²C Address Choices

♦ Selectable 2-Wire Serial Bus Timeout

Applications

♦ Under 10µA Shutdown Current

Medical Instruments

Instrumentation Panels

Security and Access

Industrial Controls

Ordering Information

PKG

PIN-

PACKAGE

PART

TEMP RANGE

CODE

Pin Configurations appear at end of data sheet.

E16-4

T1644-4

E20-1

MAX7347AEE+ -40°C to +125°C 16 QSOP

MAX7347ATE+ -40°C to +125°C 16 TQFN-EP*

MAX7348AEP+ -40°C to +125°C 20 QSOP

MAX7349AEG+ -40°C to +125°C 24 QSOP

MAX7349ATG+ -40°C to +125°C 24 TQFN-EP*

Typical Application Circuit

INPUT

2.4V TO 3.6V

E24-1

MAX7349

V+

COL_

SWITCH

ARRAY, UP

TO 64

T2444-4

+Denotes lead-free package.

*EP = Exposed paddle.

SWITCHES

ROW_

SCL

SDA

ALERT

INT

PIEZO

TRANSDUCER

AD0

GND

SOUNDER

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...29

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与MAX7347相关器件

型号	品牌	获取价格	描述	数据表
MAX7347AEE+	MAXIM	获取价格	2-Wire Interfaced Low-EMI Key Switch and Sounder Controllers
MAX7347AEE+T	MAXIM	获取价格	暂无描述
MAX7347AEE-T	MAXIM	获取价格	Microprocessor Circuit, BICMOS, PDSO16, 0.150 INCH, 0.025 INCH PITCH, MO-137AB, QSOP-16
MAX7347ATE+	MAXIM	获取价格	2-Wire Interfaced Low-EMI Key Switch and Sounder Controllers
MAX7348	MAXIM	获取价格	2-Wire Interfaced Low-EMI Key Switch and Sounder Controllers
MAX7348AEP	MAXIM	获取价格	Microprocessor Circuit, BICMOS, PDSO20, 0.150 INCH, 0.025 INCH PITCH, MO-137AD, QSOP-20
MAX7348AEP+	MAXIM	获取价格	2-Wire Interfaced Low-EMI Key Switch and Sounder Controllers
MAX7348AEP+T	MAXIM	获取价格	Microprocessor Circuit, BICMOS, PDSO20, 0.150 INCH, 0.025 INCH PITCH, MO-137AD, QSOP-20
MAX7348AEP-T	MAXIM	获取价格	Microprocessor Circuit, BICMOS, PDSO20, 0.150 INCH, 0.025 INCH PITCH, MO-137AD, QSOP-20
MAX7349	MAXIM	获取价格	2-Wire Interfaced Low-EMI Key Switch and Sounder Controllers

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