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參數(shù)資料
| 型號： | PCA9502BS,128 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 25/25頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC I/O EXPANDER I2C/SPI 24HVQFN |
| 標準包裝： | 1,500 |
| 接口： | I²C，SPI |
| 輸入/輸出數(shù)： | 8 |
| 中斷輸出： | 無 |
| 頻率 - 時鐘： | 400kHz |
| 電源電壓： | 2.3 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-VFQFN 裸露焊盤 |
| 供應商設備封裝： | 24-HVQFN（4x4） |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | 935281363128 PCA9502BS-F PCA9502BS-F-ND |
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 I2C-bus/SPI interface
When an address is sent, each device in the system compares the rst 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 I2C-bus network has a unique seven-bit address. The address of a
microcontroller is of course fully programmable, while peripheral devices usually have
xed 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 efcient than
terminating each transfer with a STOP and starting again. In a multimaster environment,
the determination of which format is more efcient 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
78
ACK
002aab046
START
condition
STOP
condition
address
R/W
0 to 6
78
data
ACK
0 to 6
78
data
ACK
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相關(guān)代理商/技術(shù)參數(shù) |
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| PCA9502BS-F | 功能描述:接口-I/O擴展器 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 安裝風格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| PCA9503A | 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 |
| PCA9504A | 功能描述:接口 - 專用 GLUE CHIP 4 RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:BGA-59 |
| PCA9504ADGG | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Glue chip 4 |
| PCA9504ADGG,112 | 功能描述:接口 - 專用 GLUE CHIP 4 RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:BGA-59 |
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