MAX7370

更新时间： 2024-11-09 11:14:55

品牌	Logo	应用领域
美信 - MAXIM		驱动器开关控制器
页数	文件大小	规格书
37页	1917K
描述
8 x 8 Key-Switch Controller and LED Driver/GPIOs with I2C Interface and High Level of ESD Protection

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MAX7370 数据手册

19-5950; Rev 0; 6/11

E V A L U A T I O N K I T A V A I L A B L E

MAX7370

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

with I C Interface and High Level of ESD Protection

General Description

Features

S Monitors Up to 64 Keys

The MAX7370 I C-interfaced peripheral provides micro-

processors with management of up to 64 key switches,

with optional GPIO and PWM-controlled LED drivers.

S Integrated High-ESD Protection

±±8k IEC 61000-4-2 Contact Discharge

±148k IEC 61000-4-2 Air-Gap Discharge

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.

S Keyscan Uses Static Matrix Monitoring for

Low-EMI Operation

S Four LED Driver Pins on COL7–COL4

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

Constant-Current LED Drive

S 256-Step PWM Individual LED Intensity-Control

Accuracy

S Individual LED Blin8 Rates and Common LED

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.

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)

The same index rows and columns in the device can be

used as a direct logic-level translator.

S Key-Switch Interrupt (INT) on Each Debounced

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

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-currentandPWMintensitycontrol. Themaximum

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.

S 1.62k to 3.6k Operating Supply koltage

S Individually Programmable GPIOs to Two Logic

Levels

S ±-Channel Individual Programmable Level

Translators

S Provides Optional GPIOs on all ROW� and COL�

Pins

S Supports Hot Insertion

S 4008bps, 5.5k Tolerant I²C Serial Interface with

Selectable Bus Timeout

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.

Ordering Information appears at end of data sheet.

Typical Operating Circuit

+5V

+1.8V

+2.6V

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

temperature range.

Applications

MAX7370

COL4

COL5

COL6

COL7

Cell Phones

INT

I/O

Notebooks

SDA

SCL

MCU

PDAs

AD0

ROW[0:7]

COL[0:3]

Handheld Games

Portable Consumer Electronics

GND

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

32 KEYS

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

�� Maxim Integrated Products

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

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

12 3 4 5 6 7...37

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与MAX7370相关器件

型号	品牌	获取价格	描述	数据表
MAX7370_12	MAXIM	获取价格	8 x 8 Key-Switch Controller and LED Driver/GPIOs
MAX7370ETG	MAXIM	获取价格	8 x 8 Key-Switch Controller and LED Driver/GPIOs with I2C Interface and High Level of ESD
MAX7370ETG+	MAXIM	获取价格	8 x 8 Key-Switch Controller and LED Driver/GPIOs
MAX7370ETG+T	MAXIM	获取价格	Interface Circuit, BICMOS, 3.50 X 3.50 MM, ROHS COMPLIANT, TQFN-24
MAX7370EWA	MAXIM	获取价格	8 x 8 Key-Switch Controller and LED Driver/GPIOs with I2C Interface and High Level of ESD
MAX7370EWA+	MAXIM	获取价格	8 x 8 Key-Switch Controller and LED Driver/GPIOs
MAX7370EWA+T	MAXIM	获取价格	Interface Circuit, BICMOS, PBGA25, 2.159 X 2.159 MM, ROHS COMPLIANT, WLP-25
MAX7375	MAXIM	获取价格	3-Pin Silicon Oscillator
MAX7375	ADI	获取价格	3引脚硅振荡器
MAX7375_V01	MAXIM	获取价格	3-Pin Silicon Oscillator

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