参数资料
型号: PCA8574PW,112
厂商: NXP Semiconductors
文件页数: 31/32页
文件大小: 0K
描述: IC I/O EXPANDER I2C 8B 16TSSOP
产品培训模块: I²C Bus Fundamentals
特色产品: NXP - I2C Interface
标准包装: 96
接口: I²C
输入/输出数: 8
中断输出:
频率 - 时钟: 400kHz
电源电压: 2.3 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 16-TSSOP
包装: 管件
包括: POR
产品目录页面: 824 (CN2011-ZH PDF)
其它名称: 568-4241-5
935283761112
PCA8574PW
PCA8574_PCA8574A
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 3 — 3 June 2013
8 of 32
NXP Semiconductors
PCA8574; PCA8574A
Remote 8-bit I/O expander for I2C-bus with interrupt
8.2 Writing to the port (Output mode)
The master (microcontroller) sends the START condition and slave address setting the
last bit of the address byte to logic 0 for the write mode. The PCA8574/74A acknowledges
and the master then sends the data byte for P7 to P0 to the port register. As the clock line
goes HIGH, the 8-bit data is presented on the port lines after it has been acknowledged by
the PCA8574/74A. If a LOW is written, the strong pull-down turns on and stays on. If a
HIGH is written, the strong pull-up turns on for 12 of the clock cycle, then the line is held
HIGH by the weak current source. The master can then send a STOP or ReSTART
condition or continue sending data. The number of data bytes that can be sent
successively is not limited and the previous data is overwritten every time a data byte has
been sent and acknowledged.
Ensure a logic 1 is written for any port that is being used as an input to ensure the strong
external pull-down is turned off.
Fig 7.
Simple quasi-bidirectional I/O
002aah683
VDD
weak 100 A
current source
(inactive when
output LOW)
output HIGH
VSS
output LOW
accelerator
pull-up
P port
P7 - P0
pull-down with
resistor to VSS or
external drive LOW
input LOW
pull-up with
resistor to VDD or
external drive HIGH
input HIGH
Fig 8.
Write mode (output)
A5 A4 A3 A2 A1 A0
0
A
SA6
slave address
START condition
R/W
acknowledge
from slave
002aah623
P6
1
P7
data 1
A
acknowledge
from slave
12345678
SCL
9
SDA
A
acknowledge
from slave
write to port
data output from port
tv(Q)
P5
data 2
DATA 2 VALID
P4 P3 P2 P1 P0
P7
P4 P3 P2 P1 P0
P6
P5
0
tv(Q)
DATA 1 VALID
P5 output voltage
Itrt(pu)
IOH
P5 pull-up output current
trst(INT)
INT
相关PDF资料
PDF描述
PCA9554DB,112 IC I/O EXPANDER I2C 8B 16SSOP
PCA9554PW,112 IC I/O EXPANDER I2C 8B 16TSSOP
PCA9554AD,112 IC I/O EXPANDER I2C 8B 16SOIC
PCA9554D,112 IC I/O EXPANDER I2C 8B 16SOIC
PCA9554APW,112 IC I/O EXPANDER I2C 8B 16TSSOP
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