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| 型號： | PCA9674 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt |
| 中文描述： | 遠程8位I / O擴展調(diào)頻I2C總線的中斷 |
| 文件頁數(shù)： | 16/34頁 |
| 文件大小： | 179K |
| 代理商： | PCA9674 |
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PCA9674_PCA9674A_2
NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 02 — 12 October 2006
16 of 34
NXP Semiconductors
PCA9674/74A
Remote 8-bit I/O expander for Fm+ I
2
C-bus with interrupt
9.
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.
9.1 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 17
).
9.1.1
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 18
.)
9.2 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 19
).
Fig 17. Bit transfer
mba607
data line
stable;
data valid
change
of data
allowed
SDA
SCL
Fig 18. Definition of START and STOP conditions
mba608
SDA
SCL
P
STOP condition
SDA
SCL
S
START condition
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| PCA9675DB | Remote 16-bit I/O expander for Fm+ I2C-bus with interrupt |
| PCA9675DK | Remote 16-bit I/O expander for Fm+ I2C-bus with interrupt |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCA9674ABS,118 | 功能描述:接口-I/O擴展器 8-BIT I2C FM+ QB 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 安裝風格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| PCA9674ABS,118-CUT TAPE | 制造商:NXP 功能描述:PCA9674 Series 1 MHz 8 bit I/O Expander Fm + I2C Bus with Interrupt - HVQFN-16 |
| PCA9674ABS-T | 功能描述:接口-I/O擴展器 8-BIT I2C FM+ QB GPIO RST PU 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 安裝風格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| PCA9674AD | 功能描述:接口-I/O擴展器 8-BIT I2C FM+ QB GPIO INT PU 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 安裝風格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| PCA9674AD,512 | 功能描述:接口-I/O擴展器 8-BIT I2C FM+ QB 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 安裝風格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
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