參數(shù)資料
型號(hào)： 933851660118
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8 I/O, PIA-GENERAL PURPOSE, PDSO16
封裝： 7.50 MM, LEAD FREE, PLASTIC, MS-013, SOT-162-1, SO-16
文件頁數(shù)： 4/33頁
文件大小： 316K
代理商： 933851660118
2002 Nov 22
12
Philips Semiconductors
Product specication
Remote 8-bit I/O expander for I2C-bus
PCF8574
7.2
Interrupt output
The PCF8574 provides an open-drain output (INT) which
can be fed to a corresponding input of the microcontroller
(see Figs 13 and 14). This gives these chips a type of
master function which can initiate an action elsewhere in
the system.
An interrupt is generated by any rising or falling edge of the
port inputs in the input mode. After time tiv the signal INT is
valid.
Resetting and reactivating the interrupt circuit is achieved
when data on the port is changed to the original setting or
data is read from or written to the port which has generated
the interrupt.
Resetting occurs as follows:
In the READ mode at the acknowledge bit after the rising
edge of the SCL signal
In the WRITE mode at the acknowledge bit after the
HIGH-to-LOW transition of the SCL signal
Interrupts which occur during the acknowledge clock
pulse may be lost (or very short) due to the resetting of
the interrupt during this pulse.
Each change of the I/Os after resetting will be detected
and, after the next rising clock edge, will be transmitted as
INT. Reading from or writing to another device does not
affect the interrupt circuit.
7.3
Quasi-bidirectional I/Os
A quasi-bidirectional I/O can be used as an input or output
without the use of a control signal for data direction
(see Fig.15). At power-on the I/Os are HIGH. In this mode
only a current source to VDD is active. An additional strong
pull-up to VDD allows fast rising edges into heavily loaded
outputs. These devices turn on when an output is written
HIGH, and are switched off by the negative edge of SCL.
The I/Os should be HIGH before being used as inputs.
handbook, full pagewidth
MBD976
MICROCONTROLLER
INT
PCF8574
(1)
PCF8574
(2)
V DD
INT
PCF8574
(16)
Fig.13 Application of multiple PCF8574s with interrupt.
Fig.14 Interrupt generated by a change of input to I/O P5.
handbook, full pagewidth
MBD972
S
0
1
0
A2
A1
A0
1
A
start condition
1
P5
R/W
acknowledge
from slave
1
SDA
SCL
DATA INTO
P5
t ir
INT
slave address (PCF8574)
data from port
1
234
567
8
P
stop
condition
t iv
相關(guān)PDF資料
PDF描述
935275581512 8 I/O, PIA-GENERAL PURPOSE, PDSO16
935275672118 8 I/O, PIA-GENERAL PURPOSE, PDSO20
933851660112 8 I/O, PIA-GENERAL PURPOSE, PDSO16
935275581518 8 I/O, PIA-GENERAL PURPOSE, PDSO16
935271753118 8 I/O, PIA-GENERAL PURPOSE, PDSO20
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
9338-5M 制造商:PRO ELEC 功能描述:EXTENSION LEAD 3WAY 5M 制造商:PRO ELEC 功能描述:EXTENSION LEAD, 3WAY, 5M
933861-000 功能描述:焊料和屏蔽管 SO63-3-9030 RoHS:否 制造商:TE Connectivity / Raychem 類型:Shield Terminators 材料:Polyvinylidene Fluoride 內(nèi)徑:5.08 mm 長(zhǎng)度:16.5 mm 最低收縮溫度: 系列:S03
933871-1 制造商:TE Connectivity 功能描述:GUIDE, MODIFIED - Bulk
9-338728-0 功能描述:集管和線殼 MICROM. MOB SMD CON RoHS:否 產(chǎn)品種類:1.0MM Rectangular Connectors 產(chǎn)品類型:Headers - Pin Strip 系列:DF50 觸點(diǎn)類型:Pin (Male) 節(jié)距:1 mm 位置/觸點(diǎn)數(shù)量:16 排數(shù):1 安裝風(fēng)格:SMD/SMT 安裝角:Right 端接類型:Solder 外殼材料:Liquid Crystal Polymer (LCP) 觸點(diǎn)材料:Brass 觸點(diǎn)電鍍:Gold 制造商:Hirose Connector
933873-1 制造商:TE Connectivity 功能描述:PLATE, CYL MTG. - Bulk
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*