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參數(shù)資料
| 型號(hào)： | PCA9557 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 8-bit I2C and SMBus I/0 port with reset |
| 中文描述： | 8位I2C和SMBus I / 0端口復(fù)位 |
| 文件頁(yè)數(shù)： | 7/16頁(yè) |
| 文件大?。?/td> | 127K |
| 代理商： | PCA9557 |
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Philips Semiconductors
Product data
PCA9557
8-bit I
2
C and SMBus I/0 port with reset
2001 Dec 12
7
CHARACTERISTICS OF THE I
2
C-BUS
The I
2
C-bus is for 2-way, 2-line communication between different ICs
or modules. The two lines are a serial data line (SDA) and a serial
clock line (SCL). Both lines must be connected to a positive supply
via a pull-up resistor when connected to the output stages of a device.
Data transfer may be initiated only when the bus is not busy.
Bit transfer
One data bit is transferred during each clock pulse. The data on the
SDA line must remain stable during the HIGH period of the clock
pulse as changes in the data line at this time will be interpreted as
control signals (see Figure 8).
SDA
SCL
SW00363
data line
stable;
data valid
change
of data
allowed
Figure 8. Bit transfer
Start and stop conditions
Both data and clock lines remain HIGH when the bus is not busy. A
HIGH-to-LOW transition of the data line, while the clock is HIGH is
defined as the start condition (S). A LOW-to-HIGH transition of the
data line while the clock is HIGH is defined as the stop condition (P)
(see Figure 9).
System configuration
A device generating a message is a ‘transmitter’, a device receiving
is the ‘receiver’. The device that controls the message is the
‘master’ and the devices which are controlled by the master are the
‘slaves’ (see Figure 10).
SDA
SCL
SW00365
S
P
SDA
SCL
START condition
STOP condition
Figure 9. Definition of start and stop conditions
MASTER
TRANSMITTER/
RECEIVER
SLAVE
RECEIVER
SLAVE
TRANSMITTER/
RECEIVER
MASTER
TRANSMITTER
MASTER
TRANSMITTER/
RECEIVER
SDA
SCL
SW00366
I
2
C
MULTIPLEXER
SLAVE
Figure 10. System configuration
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| 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 |
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| PCA9564 | Parallel bus to I2C-bus controller |
| PCA9665 | Fm+ parallel bus to I2C-bus controller |
| PCA9665N | Fm+ parallel bus to I2C-bus controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCA9557BS | 制造商:NXP Semiconductors 功能描述: |
| PCA9557BS,118 | 功能描述:接口-I/O擴(kuò)展器 8-BIT I2C FM TP GPIO RST 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 |
| PCA9557D | 功能描述:接口-I/O擴(kuò)展器 Remote 8B 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 |
| PCA9557D,112 | 功能描述:接口-I/O擴(kuò)展器 OCT SMBUS/I2C INTRFC 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 |
| PCA9557D,118 | 功能描述:接口-I/O擴(kuò)展器 8-BIT I2C FM TP GPIO 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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