Datasheet > PCF8574T-3.518

PCF8574T-3.518

更新时间： 2024-11-13 12:02:51

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
33页	800K
描述
Remote 8-bit I/O expander for I2C-bus with interrupt

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PCF8574T-3.518 数据手册

PCF8574; PCF8574A

Remote 8-bit I/O expander for I²C-bus with interrupt

Rev. 5 — 27 May 2013

Product data sheet

1. General description

The PCF8574/74A provides general-purpose remote I/O expansion via the two-wire

bidirectional I²C-bus (serial clock (SCL), serial data (SDA)).

The devices consist of eight quasi-bidirectional ports, 100 kHz I²C-bus interface, three

hardware address inputs and interrupt output operating between 2.5 V and 6 V. The

quasi-bidirectional port can be independently assigned as an input to monitor interrupt

status or keypads, or as an output to activate indicator devices such as LEDs. System

master can read from the input port or write to the output port through a single register.

The low current consumption of 2.5 A (typical, static) is great for mobile applications and

the latched output ports directly drive LEDs.

The PCF8574 and PCF8574A are identical, except for the different fixed portion of the

slave address. The three hardware address pins allow eight of each device to be on the

same I²C-bus, so there can be up to 16 of these I/O expanders PCF8574/74A together on

the same I²C-bus, supporting up to 128 I/Os (for example, 128 LEDs).

The active LOW open-drain interrupt output (INT) can be connected to the interrupt logic

of the microcontroller and is activated when any input state differs from its corresponding

input port register state. It is used to indicate to the microcontroller that an input state has

changed and the device needs to be interrogated without the microcontroller continuously

polling the input register via the I²C-bus.

The internal Power-On Reset (POR) initializes the I/Os as inputs with a weak internal

pull-up 100 A current source.

2. Features and benefits

 I²C-bus to parallel port expander

 100 kHz I²C-bus interface (Standard-mode I²C-bus)

 Operating supply voltage 2.5 V to 6 V with non-overvoltage tolerant I/O held to V_DD

with 100 A current source

 8-bit remote I/O pins that default to inputs at power-up

 Latched outputs directly drive LEDs

 Total package sink capability of 80 mA

 Active LOW open-drain interrupt output

 Eight programmable slave addresses using three address pins

 Low standby current (2.5 A typical)

 40 C to +85 C operation

 ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per

JESD22-C101

12 3 4 5 6 7...33

中文翻译

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与PCF8574T-3.518相关器件

型号	品牌	获取价格	描述	数据表
PCF8574TD	NXP	获取价格	IC 8 I/O, PIA-GENERAL PURPOSE, PDSO16, 7.50 MM, LEAD FREE, PLASTIC, MS-013, SOT-162-1, SO-
PCF8574TDK	NXP	获取价格	IC 8 I/O, PIA-GENERAL PURPOSE, PDSO20, 4.40 MM, PLASTIC, MO-152, SOT-266-1, SSOP-20, Paral
PCF8574TDK-T	ETC	获取价格	I/O Port
PCF8574TD-T	ETC	获取价格	I/O Port
PCF8574TS	NXP	获取价格	Remote 8-bit I/O expander for I2C-bus
PCF8574TS/3	NXP	获取价格	Remote 8-bit I/O expander for I2C-bus with interrupt
PCF8574TS/3,112	NXP	获取价格	PCF8574; PCF8574A - Remote 8-bit I/O expander
PCF8574TS/3,518	NXP	获取价格	IC IC,I/O PORT,8-BIT,CMOS,SSOP,20PIN,PLASTIC, Parallel IO Port
PCF8574TS/F3	NXP	获取价格	IC 8 I/O, PIA-GENERAL PURPOSE, PDSO20, 4.40 MM, PLASTIC, MO-152, SOT-266-1, SSOP-20, Paral
PCF8574TS/F3,112	NXP	获取价格	PCF8574; PCF8574A - Remote 8-bit I/O expander

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