參數(shù)資料
型號(hào)： PCA9555
廠商： NXP Semiconductors N.V.
英文描述： 16-bit I2C and SMBus I/O port with interrupt
中文描述： 16位I2C和SMBus I / O端口的中斷
文件頁(yè)數(shù)： 7/22頁(yè)
文件大小： 185K
代理商： PCA9555
Philips Semiconductors
Product data sheet
PCA9555
16-bit I
2
C and SMBus I/O port with interrupt
2004 Sep 30
7
DEVICE ADDRESS
0
1
0
0
A2
A1
A0
slave address
su01441
fixed
programmable
R/W
Figure 5. PCA9555 address
BUS TRANSACTIONS
Writing to the port registers
Data is transmitted to the PCA9555 by sending the device address
and setting the least significant bit to a logic 0 (see Figure 5 for device
address). The command byte is sent after the address and determines
which register will receive the data following the command byte.
The eight registers within the PCA9555 are configured to operate
as four register pairs. The four pairs are Input Ports, Output Ports,
Polarity Inversion Ports, and Configuration Ports. After sending data
to one register, the next data byte will be sent to the other register in
the pair (see Figures and ). For example, if the first byte is sent to
Output Port (register 3), then the next byte will be stored in Output
Port 0 (register 2). There is no limitation on the number of data bytes
sent in one write transmission. In this way, each 8-bit register may
be updated independently of the other registers.
Reading the port registers
In order to read data from the PCA9555, the bus master must first
send the PCA9555 address with the least significant bit set to a
logic 0 (see Figure 5 for device address). The command byte is sent
after the address and determines which register will be accessed.
After a restart, the device address is sent again but this time, the
least significant bit is set to a logic 1. Data from the register defined
by the command byte will then be sent by the PCA9555 (see
Figures 8 and 9). Data is clocked into the register on the falling edge
of the acknowledge clock pulse. After the first byte is read, additional
bytes may be read but the data will now reflect the information in the
other register in the pair. For example, if you read Input Port 1, then
the next byte read would be Input Port 0. There is no limitation on
the number of data bytes received in one read transmission but the
final byte received, the bus master must not acknowledge the data.
Interrupt Output
The open-drain interrupt output is activated when one of the port
pins change state and the pin is configured as an input. The interrupt
is deactivated when the input returns to its previous state or the
input port register is read (see Figure 9). A pin configured as an
output cannot cause an interrupt. Since each 8-bit port is read
independently, the interrupt caused by Port 0 will not be cleared by a
read of Port 1 or the other way around.
Note that changing an I/O from an output to an input may cause a
false interrupt to occur if the state of the pin does not match the
contents of the Input Port register.
相關(guān)PDF資料
PDF描述
PCA9556 Octal SMBus Registered Interface(八位SM總線寄存接口)
PCA9556PW Octal SMBus Registered Interface
PCA9557 8-bit I2C and SMBus I/0 port with reset
PCA9558 8-bit I2C and SMBus I/O port with 5-bit multiplexed/1-bit latched 6-bit I2C EEPROM and 2 k bit EEPROM
PCA9559 5-bit multiplexed/1-bit latched 6-bit I I C EEPROM(5位多路的/1位鎖存的6位IIC EEPROM)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCA9555_08 制造商:TI 制造商全稱:Texas Instruments 功能描述:REMOTE 16-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS
PCA9555_10 制造商:TI 制造商全稱:Texas Instruments 功能描述:REMOTE 16-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS
PCA9555_13 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:16-bit I2C-bus and SMBus I/O port with interrupt
PCA9555A 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Smart, simple solutions for the 12 most common design concerns
PCA9555AHF 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low-voltage 16-bit I2C-bus I/O port with interrupt and weak pull-up
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

*
*
*