欢迎访问ic37.com |
会员登录 免费注册
发布采购

PCF8574TS/3 参数 Datasheet PDF下载

PCF8574TS/3图片预览
型号: PCF8574TS/3
PDF下载: 下载PDF文件 查看货源
内容描述: 远程8位I / O扩展器I2C总线与中断 [Remote 8-bit I/O expander for I2C-bus with interrupt]
分类和应用:
文件页数/大小: 33 页 / 800 K
品牌: PHILIPS [ NXP SEMICONDUCTORS ]
 浏览型号PCF8574TS/3的Datasheet PDF文件第2页浏览型号PCF8574TS/3的Datasheet PDF文件第3页浏览型号PCF8574TS/3的Datasheet PDF文件第4页浏览型号PCF8574TS/3的Datasheet PDF文件第5页浏览型号PCF8574TS/3的Datasheet PDF文件第6页浏览型号PCF8574TS/3的Datasheet PDF文件第7页浏览型号PCF8574TS/3的Datasheet PDF文件第8页浏览型号PCF8574TS/3的Datasheet PDF文件第9页  
PCF8574; PCF8574A
Remote 8-bit I/O expander for I
2
C-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 I
2
C-bus (serial clock (SCL), serial data (SDA)).
The devices consist of eight quasi-bidirectional ports, 100 kHz I
2
C-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 I
2
C-bus, so there can be up to 16 of these I/O expanders PCF8574/74A together on
the same I
2
C-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 I
2
C-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
I
2
C-bus to parallel port expander
100 kHz I
2
C-bus interface (Standard-mode I
2
C-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