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PCA9574PW

更新时间： 2024-11-14 11:51:35

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
32页	172K
描述
8-bit I2C-bus and SMBus, level translating, low voltage GPIO with reset and interrupt

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PCA9574PW 数据手册

PCA9574

8-bit I²C-bus and SMBus, level translating, low voltage GPIO

with reset and interrupt

Rev. 02 — 27 July 2009

Product data sheet

1. General description

The PCA9574 is a CMOS device that provides 8 bits of General Purpose parallel

Input/Output (GPIO) expansion in low voltage processor and handheld battery powered

mobile applications and was developed to enhance the NXP family of I²C-bus I/O

expanders. The improvements include lower supply current, lower operating voltage of

1.1 V to 3.6 V, dual and separate supply rails to allow voltage level translation anywhere

between 1.1 V and 3.6 V, 400 kHz clock frequency, and smaller packaging. Any of the

8 I/O ports can be conﬁgured as an input or output independent of each other and default

on start-up to inputs. I/O expanders provide a simple solution when additional I/Os are

needed while keeping interconnections to a minimum; for example in battery powered

mobile applications and clamshell devices for interfacing to sensors, push buttons,

keypad, etc. In addition to providing a ﬂexible set of GPIOs, it simpliﬁes interconnection of

a processor running at one voltage level to I/O devices operating at a different (usually

higher) voltage level. PCA9574 has built-in level shifting feature that makes these devices

extremely ﬂexible in mixed signal environments where communication between

incompatible I/Os is required. The core of PCA9574 can operate at a voltage as low as

1.1 V while the I/O bank can operate in the range 1.1 V to 3.6 V. Bus hold with

programmable on-chip pull-up or pull-down feature for I/Os is also provided.

The system master can enable the I/Os as either inputs or outputs by writing to the I/O

conﬁguration register bits. The data for each input or output is kept in the corresponding

Input or Output register. The polarity of the read register can be inverted with the Polarity

inversion register (active HIGH or active LOW operation). Either a bus-hold function or

pull-up/pull-down feature can be selected by programming corresponding registers. The

bus-hold provides a valid logic level when the I/O bus is not actively driven. When

bus-hold feature is not selected, the I/O ports can be conﬁgured to have pull-up or

pull-down by programming the pull-up/pull-down conﬁguration register.

An open-drain interrupt output pin (INT) allows monitoring of the input pins and is

asserted each time a change occurs on an input port unless that port is masked

(default = masked). A ‘GPIO All Call’ command allows programming multiple PCA9574s

at the same time even if they have different individual I²C-bus addresses. This allows

optimal code programming when more than one device needs to be programmed with the

same instruction or if all outputs need to be turned on or off at the same time. The internal

Power-On Reset (POR) or hardware reset pin (RESET) initializes the 8 I/Os as inputs,

sets the registers to their default values and initializes the device state machine. The I/O

bank is held in its default state when the logic supply (V_DD) is off.

One address select pin allows up to two PCA9574 devices to be connected with two

different addresses on the same I²C-bus.

12 3 4 5 6 7...32

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与PCA9574PW相关器件

型号	品牌	获取价格	描述	数据表
PCA9574PW,112	NXP	获取价格	PCA9574 - 8-bit I²C-bus and SMBus, level tran
PCA9574PW,118	NXP	获取价格	PCA9574 - 8-bit I²C-bus and SMBus, level tran
PCA9574PW-T	NXP	获取价格	IC,I/O PORT,8-BIT,CMOS,TSSOP,16PIN,PLASTIC
PCA9575	NXP	获取价格	16-bit I2C-bus and SMBus, level translating, low voltage GPIO with reset and interrupt
PCA9575HF	NXP	获取价格	16-bit I2C-bus and SMBus, level translating, low voltage GPIO with reset and interrupt
PCA9575HF,118	NXP	获取价格	PCA9575 - 16-bit I²C-bus and SMBus, level tra
PCA9575PW1	NXP	获取价格	16-bit I2C-bus and SMBus, level translating, low voltage GPIO with reset and interrupt
PCA9575PW1,118	NXP	获取价格	PCA9575 - 16-bit I²C-bus and SMBus, level tra
PCA9575PW2	NXP	获取价格	16-bit I2C-bus and SMBus, level translating, low voltage GPIO with reset and interrupt
PCA9575PW2,118	NXP	获取价格	PCA9575 - 16-bit I²C-bus and SMBus, level tra

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