參數(shù)資料
型號(hào)： PCF8575
廠商： NXP Semiconductors N.V.
英文描述： Remote 16-bit I/O expander for I2C-bus
中文描述： 遠(yuǎn)程16位I / O擴(kuò)展I2C總線
文件頁(yè)數(shù)： 11/24頁(yè)
文件大小： 105K
代理商： PCF8575
1999 Apr 07
11
Philips Semiconductors
Product specification
Remote 16-bit I/O expander for I
2
C-bus
PCF8575
7.3
Reading from a port (input mode)
All ports programmed as input should be set to logic 1.
To read, the master (microcontroller) first addresses the
slave device after it receives the interrupt. By setting the
last bit of the byte containing the slave address to logic 1
the read mode is entered. The data bytes that follow on the
SDA are the values on the ports.
If the data on the input port changes faster than the master
can read, this data may be lost.
7.4
Writing to the port (output mode)
To write, the master (microcontroller) first addresses the
slave device. By setting the last bit of the byte containing
the slave address to logic 0 the write mode is entered.
The PCF8575 acknowledges and the master sends the
first data byte for P07 to P00. After the first data byte is
acknowledged by the PCF8575, the second data byte
P17 to P10 is sent by the master. Once again the
PCF8575 acknowledges the receipt of the data after which
this 16-bit data is presented on the port lines.
The number of data bytes that can be sent successively is
not limited. After every two bytes the previous data is
overwritten.
The first data byte in every pair refers to Port 0
(P07 to P00), whereas the second data byte in every pair
refers to Port 1 (P17 to P10), see Fig.11.
7.5
Interrupt
The PCF8575 provides an open-drain interrupt (INT)
which can be fed to a corresponding input of the
microcontroller (see Figs 9, 10 and 12). This gives these
chips a kind of a 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. After time t
iv
the signal INT is valid.
The interrupt disappears when data on the port is changed
to the original setting or data is read from or written to the
device which has generated the interrupt.
In the write mode the interrupt may become deactivated
(HIGH) on the rising edge of the write to port pulse. On the
falling edge of the write to port pulse the interrupt is
definitely deactivated (HIGH).
The interrupt is reset in the read mode on the rising edge
of the read from port pulse.
During the resetting of the interrupt itself any changes on
the I/Os may not generate an interrupt. After the interrupt
is reset any change in I/Os will be detected and transmitted
as an INT.
Fig.11 Correlation between bits and ports.
handbook, full pagewidth
MGL545
07
06
05
04
03
02
01
00
P07 P06 P05 P04 P03 P02 P01 P00
A
First Byte
17
16
15
14
13
12
11
10
P17 P16 P15 P14 P13 P12 P11 P10
A
Second Byte
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCF8575C 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Remote 16-bit I/O expander for I2C-bus
PCF8575CDB 功能描述:接口-I/O擴(kuò)展器 Remote 16-Bit I2C & SMBus 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
PCF8575CDBE4 功能描述:接口-I/O擴(kuò)展器 Remote 16-Bit I2C & SMBus 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
PCF8575CDBG4 功能描述:接口-I/O擴(kuò)展器 Rem 16B I2C & SMBus 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
PCF8575CDBQR 功能描述:接口-I/O擴(kuò)展器 Remote 16-Bit I2C & SMBus 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
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