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參數(shù)資料
| 型號(hào)： | PCA9502 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 8-bit I/O expander with I2C-bus/SPI interface |
| 中文描述： | 8位I / O擴(kuò)展接口與I2C-bus/SPI |
| 文件頁數(shù)： | 9/25頁 |
| 文件大小： | 125K |
| 代理商： | PCA9502 |
PCA9502_3
NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 03 — 13 October 2006
9 of 25
NXP Semiconductors
PCA9502
8-bit I/O expander with I
2
C-bus/SPI interface
When an address is sent, each device in the system compares the first seven bits after the
START with its own address. If there is a match, the device will consider itself addressed
by the master, and will send an acknowledge. The device could also determine if in this
transaction it is assigned the role of a slave receiver or slave transmitter, depending on the
R/W bit.
Each node of the I
2
C-bus network has a unique seven-bit address. The address of a
microcontroller is of course fully programmable, while peripheral devices usually have
fixed and programmable address portions.
When the master is communicating with one device only, data transfers follow the format
of
Figure 8
, where the R/W bit could indicate either direction. After completing the transfer
and issuing a STOP condition, if a master would like to address some other device on the
network, it could start another transaction by issuing a new START.
Another way for a master to communicate with several different devices would be by using
a ‘repeated START’. After the last byte of the transaction was transferred, including its
acknowledge (or negative acknowledge), the master issues another START, followed by
address byte and data, without effecting a STOP. The master may communicate with a
number of different devices, combining ‘reads’ and ‘writes’. After the last transfer takes
place, the master issues a STOP and releases the bus. Possible data formats are
demonstrated in
Figure 9
. Note that the repeated START allows for both change of a slave
and a change of direction, without releasing the bus. We shall see later on that the change
of direction feature can come in handy even when dealing with a single device.
In a single master system, the repeated START mechanism may be more efficient than
terminating each transfer with a STOP and starting again. In a multimaster environment,
the determination of which format is more efficient could be more complicated, as when a
master is using repeated STARTs it occupies the bus for a long time and thus preventing
other devices from initiating transfers.
Fig 8.
A complete data transfer
S
P
SDA
SCL
0 to 6
7
8
ACK
002aab046
START
condition
STOP
condition
address
R/W
0 to 6
7
8
data
ACK
0 to 6
7
8
data
ACK
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCA9502BS | 功能描述:接口-I/O擴(kuò)展器 8-BITI/O EXPDR W/I2C-SPI INTRF 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 |
| PCA9502BS,128 | 功能描述:接口-I/O擴(kuò)展器 8-BITI/O EXPDR 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 |
| PCA9502BS,151 | 功能描述:接口-I/O擴(kuò)展器 I/O EXPANDER I2C 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 |
| PCA9502BS,157 | 功能描述:接口-I/O擴(kuò)展器 8-BITI/O EXPDR 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 |
| PCA9502BS-F | 功能描述:接口-I/O擴(kuò)展器 8-BITI/O EXPDR W/I2C-SPI INTRF 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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