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| 型号： | PCA9502BS,151 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 23/25页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER I2C/SPI 24HVQFN |
| 产品培训模块： | I²C Bus Fundamentals |
| 特色产品： | NXP - I2C Interface |
| 标准包装： | 490 |
| 接口： | I²C，SPI |
| 输入/输出数： | 8 |
| 中断输出： | 无 |
| 频率 - 时钟： | 400kHz |
| 电源电压： | 2.3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘 |
| 供应商设备封装： | 24-HVQFN（4x4） |
| 包装： | 托盘 |
| 产品目录页面： | 824 (CN2011-ZH PDF) |
| 其它名称： | 568-3635 935281363151 PCA9502BS-S |
PCA9502_3
NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 03 — 13 October 2006
7 of 25
NXP Semiconductors
PCA9502
8-bit I/O expander with I2C-bus/SPI interface
9.
I2C-bus operation
The two lines of the I2C-bus are a serial data line (SDA) and a serial clock line (SCL). Both
lines are connected to a positive supply via a pull-up resistor, and remain HIGH when the
bus is not busy. Each device is recognized by a unique address whether it is a
microcomputer, LCD driver, memory or keyboard interface and can operate as either a
transmitter or receiver, depending on the function of the device. A device generating a
message or data is a transmitter, and a device receiving the message or data is a
receiver. Obviously, a passive function like an LCD driver could only be a receiver, while a
microcontroller or a memory can both transmit and receive data.
9.1 Data transfers
One data bit is transferred during each clock pulse (see Figure 4). The data on the SDA
line must remain stable during the HIGH period of the clock pulse in order to be valid.
Changes in the data line at this time will be interpreted as control signals. A HIGH-to-LOW
transition of the data line (SDA) while the clock signal (SCL) is HIGH indicates a START
condition, and a LOW-to-HIGH transition of the SDA while SCL is HIGH denes a STOP
condition (see Figure 5). The bus is considered to be busy after the START condition and
free again at a certain time interval after the STOP condition. The START and STOP
conditions are always generated by the master.
The number of data bytes transferred between the START and STOP condition from
transmitter to receiver is not limited. Each byte, which must be eight bits long, is
transferred serially with the most signicant bit rst, and is followed by an acknowledge bit.
(see Figure 6). The clock pulse related to the acknowledge bit is generated by the master.
The device that acknowledges has to pull down the SDA line during the acknowledge
clock pulse, while the transmitting device releases this pulse (see Figure 7).
Fig 4.
Bit transfer on the I2C-bus
Fig 5.
START and STOP conditions
mba607
data line
stable;
data valid
change
of data
allowed
SDA
SCL
mba608
SDA
SCL
P
STOP condition
SDA
SCL
S
START condition
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相关代理商/技术参数 |
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| PCA9502BS-F | 功能描述:接口-I/O扩展器 8-BITI/O EXPDR W/I2C-SPI INTRF RoHS:否 制造商:NXP Semiconductors 逻辑系列: 输入/输出端数量: 最大工作频率:100 kHz 工作电源电压:1.65 V to 5.5 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:HVQFN-16 封装:Reel |
| PCA9503A | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Smart, simple solutions for the 12 most common design concerns |
| PCA9504A | 功能描述:接口 - 专用 GLUE CHIP 4 RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
| PCA9504ADGG | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Glue chip 4 |
| PCA9504ADGG,112 | 功能描述:接口 - 专用 GLUE CHIP 4 RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
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