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參數(shù)資料
| 型號： | PCF8574T/3,518 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 4/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC I/O EXPANDER I2C 8B 16SOIC |
| 產品培訓模塊： | I²C Bus Fundamentals |
| 特色產品： | NXP - I2C Interface |
| 標準包裝： | 1 |
| 接口： | I²C |
| 輸入/輸出數(shù)： | 8 |
| 中斷輸出： | 是 |
| 頻率 - 時鐘： | 100kHz |
| 電源電壓： | 2.5 V ~ 6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 16-SO |
| 包裝： | 標準包裝 |
| 包括： | POR |
| 產品目錄頁面： | 827 (CN2011-ZH PDF) |
| 配用： | 568-3615-ND - DEMO BOARD I2C |
| 其它名稱： | 568-1077-6 |
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
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相關代理商/技術參數(shù) |
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|---|---|
| PCF8574TD | 功能描述:I2C 接口集成電路 REMOTE I/O EXPANDER RoHS:否 制造商:NXP Semiconductors 電源電壓-最大:5.5 V 電源電壓-最小:2.3 V 最大工作頻率:400 KHz 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-16 |
| PCF8574TDK-T | 制造商:NXP Semiconductors 功能描述: 制造商:PHILIPS-SEMI 功能描述: |
| PCF8574TDM | 制造商:NXP Semiconductors 功能描述: |
| PCF8574TD-T | 制造商:NXP Semiconductors 功能描述: |
| PCF8574TS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Remote 8-bit I/O expander for I2C-bus |
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