參數(shù)資料
型號(hào)： PCF8574AT
廠商： NXP Semiconductors N.V.
元件分類(lèi)： I2C/I2S
英文描述： Remote 8-bit I-O expander for I2C-bus
封裝： PCF8574AP<SOT38-4 (DIP16)|<<http://www.nxp.com/packages/SOT38-4.html<1<Always Pb-free,;PCF8574AT/3<SOT162-1 (SO16)|<<http://www.nxp.com/packages/SOT162-1.html<1<wee
文件頁(yè)數(shù)： 12/24頁(yè)
文件大?。?/td> 132K
代理商： PCF8574AT
2002 Nov 22
12
Philips Semiconductors
Product specification
Remote 8-bit I/O expander for I
2
C-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.
Aninterruptisgeneratedbyanyrisingorfallingedgeofthe
port inputs in the input mode. After time t
iv
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
dataisreadfromorwrittentotheportwhichhasgenerated
the interrupt.
Resetting occurs as follows:
IntheREADmodeattheacknowledgebitaftertherising
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 V
DD
is active. An additional strong
pull-up to V
DD
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
INT
INT
PCF8574
(1)
PCF8574
(2)
VDD
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
0
A2
A1
A0
1
A
start condition
1
P5
R/W
acknowledge
from slave
1
SDA
SCL
DATA INTO
P5
tir
INT
slave address (PCF8574)
data from port
1
2
3
4
5
6
7
8
P
stop
condition
tiv
相關(guān)PDF資料
PDF描述
PCF8574P Remote 8-bit I-O expander for I2C-bus
PCF8574T Remote 8-bit I-O expander for I2C-bus
PCH1632 CHIP TYPE IMPEDANCE CONVERTER
PCH163250B CHIP TYPE IMPEDANCE CONVERTER
PCH163250T CHIP TYPE IMPEDANCE CONVERTER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCF8574AT 制造商:NXP Semiconductors 功能描述:IC 8BIT I/O EXPANDER 8574 SOIC16
PCF8574AT/3 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Remote 8-bit I/O expander for I2C-bus with interrupt
PCF8574AT/3,512 功能描述:接口-I/O擴(kuò)展器 REMOTE I/O EXPANDER RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel
PCF8574AT/3,518 功能描述:接口-I/O擴(kuò)展器 EXTENDED I/O EXPANDER I2C RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel
PCF8574AT/3,518-CUT TAPE 制造商:NXP 功能描述:PCF8574 Series 2.5 - 6 V Remote 8-bit I/O Expander for I2C-bus - SOIC-16
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