max7301datasheet_ha17458资源-CSDN文库

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### MAX7301 数据手册解析 #### 一、概述 MAX7301是一款由Maxim Integrated设计的紧凑型串行接口I/O扩展器，适用于微处理器，最多可提供28个端口。该器件支持2.5V至5.5V的工作电压范围，并通过一个高速的SPI-/QSPI-/MICROWIRE-兼容的4线串行接口进行控制。每个端口都可单独配置为逻辑输入或逻辑输出。 #### 二、主要特点与应用领域 **主要特点：** 1. **高速串行接口**：支持高达26MHz的SPI-/QSPI-/MICROWIRE-兼容的4线串行接口。 2. **宽工作电压范围**：2.5V至5.5V。 3. **温度范围广泛**：-40°C到+125°C。 4. **多端口配置**：20或28个I/O端口，每个端口都可以配置为： - 推挽逻辑输出（可下沉10mA电流，源出4.5mA电流）； - 施密特触发逻辑输入； - 施密特触发逻辑输入带内部上拉电阻。 5. **低功耗**：最大关断电流仅为11μA。 6. **逻辑转换检测**：7个端口具备可配置的逻辑转换检测功能，可以在端口电平发生变化时触发中断。 **应用领域：** 1. **白色家电**：如冰箱、洗衣机等智能控制需求。 2. **汽车电子**：用于车辆中的各种控制系统。 3. **游戏机**：提高交互性和功能性。 4. **工业控制器**：适用于自动化设备、机器人等领域。 5. **系统监控**：实时监测和控制系统的状态。 #### 三、封装类型与引脚配置 MAX7301系列提供了不同的封装选项： 1. **MAX7301AAI**：20个端口，28引脚SSOP封装。 2. **MAX7301AAX**：28个端口，36引脚SSOP封装。 3. **MAX7301ATL**：28个端口，40引脚TQFN封装。 **引脚配置示例（MAX7301AAX）：** - **电源引脚**：V+（正电源）、GND（地）。 - **串行接口引脚**：SCLK（串行时钟）、DIN（数据输入）、DOUT（数据输出）。 - **I/O端口**：P1至P28（端口1至端口28）。 #### 四、工作原理与配置方式 MAX7301通过其4线串行接口进行配置，支持以下操作模式： 1. **读取和写入寄存器**：用户可以通过串行接口对寄存器进行读取和写入操作来配置端口功能。 2. **端口配置**：用户可以将端口配置为输入或输出，并设置输入端口的施密特触发特性以及是否启用内部上拉电阻。 3. **中断管理**：通过配置端口的逻辑转换检测功能，可以在检测到端口状态变化时触发中断信号。 #### 五、相关产品对比 - **MAX7300**：提供了一个2线I2C*接口版本，适用于需要更简单串行接口的应用场景。 - **MAX6957**：提供了一个与MAX7301管脚兼容的端口扩展器，增加了24mA恒流LED驱动能力，适用于需要额外LED驱动功能的应用场合。 #### 六、总结 MAX7301作为一款高性能的I/O扩展器，以其丰富的端口配置选项、高速串行接口以及广泛的温度工作范围，在多种应用领域展现出强大的优势。无论是用于白色家电、汽车电子还是工业控制领域，MAX7301都能满足不同应用场景下的特定需求。通过灵活的配置和管理方式，该芯片为设计者提供了更多的可能性和灵活性。

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General Description

The MAX7301 compact, serial-interfaced I/O expander

(or general-purpose I/O (GPIO) peripheral) provides

microprocessors with up to 28 ports. Each port is indi-

vidually user configurable to either a logic input or logic

output.

Each port can be configured either as a push-pull logic

output capable of sinking 10mA and sourcing 4.5mA,

or a Schmitt logic input with optional internal pullup.

Seven ports feature configurable transition detection

logic, which generates an interrupt upon change of port

logic level. The MAX7301 is controlled through an

SPI™-compatible 4-wire serial interface.

The MAX7301AAX and MAX7301ATL have 28 ports and

are available in 36-pin SSOP and 40-pin TQFN packages,

respectively. The MAX7301AAI has 20 ports and is avail-

able in a 28-pin SSOP package.

For a 2-wire I

C*-interfaced version, refer to the

MAX7300 data sheet.

For a pin-compatible port expander with additional

24mA constant-current LED drive capability, refer to the

MAX6957 data sheet.

Applications

White Goods

Automotive

Gaming Machines

Industrial Controllerss

System Monitoring

Features

♦ High-Speed 26MHz SPI-/QSPI-™/MICROWIRE™-

Compatible Serial Interface

♦ 2.5V to 5.5V Operation

♦ -40°C to +125°C Temperature Range

♦ 20 or 28 I/O Ports, Each Configurable as

Push-Pull Logic Output

Schmitt Logic Input

Schmitt Logic Input with Internal Pullup

♦ 11µA (max) Shutdown Current

♦ Logic Transition Detection for Seven I/O Ports

MAX7301

4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and

28-Port I/O Expander

________________________________________________________________ Maxim Integrated Products 1

19-2438; Rev 6; 4/06

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.

Pin Configurations appear at end of data sheet.

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX7301AAI+

-40°C to +125°C

28 SSOP A28-1

MAX7301AAX+

-40°C to +125°C

36 SSOP A36-4

MAX7301ATL+

-40°C to +125°C

40 TQFN

T4066- 5

P10

P12

P13

P11

P15

P14

P17

P18

P16

P20

P19

P22

P23

P21

V+

GND

SCLK

DIN

DOUT

P30

P29

P31

P27

P28

P25

P24

P26

MAX7301

SSOP

CHIP SELECT

DATA IN

CLOCK IN

DATA OUT

I/O 4

I/O 5

I/O 6

I/O 7

I/O 8

I/O 9

I/O 10

I/O 11

I/O 12

I/O 13

I/O 14

I/O 15

I/O 16

I/O 17

I/O 18

I/O 19

I/O 20

I/O 21

I/O 22

I/O 23

I/O 24

I/O 25

I/O 26

I/O 27

I/O 28

I/O 29

I/O 30

I/O 31

47nF

ISET

39kΩ

Typical Operating Circuit

*Purchase of I

C components from Maxim Integrated Products,

Inc., or one of its sublicensed Associated Companies, conveys

a license under the Philips I

C Patent Rights to use these com-

ponents in an I

C system, provided that the system conforms

to the I

C Standard Specification as defined by Philips.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

+Denotes lead-free package.

MAX7301

4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and

28-Port I/O Expander

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

(Voltage with respect to GND.)

V+ .............................................................................-0.3V to +6V

All Other Pins................................................-0.3V to (V+ + 0.3V)

P4–P31 Current ................................................................±30mA

GND Current .....................................................................800mA

Continuous Power Dissipation (T

= +70°C)

28-Pin SSOP (derate 9.5mW/°C above +70°C) ...........762mW

36-Pin SSOP (derate 11.8mW/°C above +70°C) .........941mW

40-Pin TQFN (derate 26.3mW/°C above +70°C) ....2963.0mW

Operating Temperature Range

MIN

, T

MAX

) ..................................................-40°C to +125°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

(Typical Operating Circuit, V+ = 2.5V to 5.5V, T

= T

MIN

to T

MAX

, unless otherwise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Operating Supply Voltage V+

2.5

5.5 V

= +25°C 5.5 8

= - 40° C to + 85°C

10Shutdown Supply Current I

SHDN

All digital inputs at V+

or GND

= T

MIN

to T

MAX

µA

= +25°C

180

230

= - 40° C to + 85°C

250

Operating Supply Current

(Output High)

GPOH

All ports programmed

as outputs high, no

load, all other inputs

at V+ or GND

= T

MIN

to T

MAX

270

µA

= +25°C

170

210

= - 40° C to + 85°C

230

Operating Supply Current

(Output Low)

GPOL

All ports programmed

as outputs low, no

load, all other inputs

at V+ or GND

= T

MIN

to T

MAX

240

µA

= +25°C

110

135

= - 40° C to + 85°C

140

Operating Supply Current

(Input)

GPI

All ports programmed

as inputs without

pullup, ports, and all

other inputs at V+ or

GND

= T

MIN

to T

MAX

145

µA

INPUTS AND OUTPUTS

Logic High Input Voltage

Port Inputs

0.7 ✕

V+

Logic Low Input Voltage

Port Inputs

0.3 ✕

V+

Input Leakage Current I

, I

GPIO inputs without pullup,

VPORT = V+ to GND

-100

±1

+100

V+ = 2.5V 12 19 30

GPIO Input Internal Pullup to V+

V+ = 5.5V 80

120

180

µA

Hysteresis Voltage GPIO Inputs

∆V

0.3 V

GPIO outputs, I

SOURCE

= 2mA,

= -40°C to +85°C

V+ -

0.7

Output High Voltage V

GPIO outputs, I

SOURCE

= 1mA,

= T

MIN

to T

MAX

(Note 2)

V+ -

0.7

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