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| 型号： | PCA9539BS,115 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 6/37页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER I2C/SMBU 24HVQFN |
| 标准包装： | 1,500 |
| 系列： | * |
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PCA9539_PCA9539R
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 6 — 6 February 2013
14 of 37
NXP Semiconductors
PCA9539; PCA9539R
16-bit I2C-bus and SMBus low power I/O port with interrupt and reset
6.6.3 Interrupt output
The open-drain interrupt output is activated when one of the port pins changes state and
the pin is configured as an input. The interrupt is deactivated when the input returns to its
previous state or the Input port register is read (see Figure 10). A pin configured as an
output cannot cause an interrupt. Since each 8-bit port is read independently, the interrupt
caused by Port 0 will not be cleared by a read of Port 1 or the other way around.
Remark: Changing an I/O from an output to an input may cause a false interrupt to occur
if the state of the pin does not match the contents of the Input port register.
7.
Characteristics of the I2C-bus
The I2C-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.
7.1 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 12).
7.1.1 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 13).
Fig 12. Bit transfer
mba607
data line
stable;
data valid
change
of data
allowed
SDA
SCL
Fig 13. Definition of START and STOP conditions
mba608
SDA
SCL
P
STOP condition
S
START condition
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相关代理商/技术参数 |
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| PCA9539BS118 | 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
| PCA9539BSHP | 功能描述:I/O Expander 16 I2C 400kHz 24-HVQFN (4x4) 制造商:nxp semiconductors 系列:- 包装:剪切带（CT） 零件状态:停产 I/O 数:16 接口:I2C 中断输出:是 特性:POR 输出类型:开路漏极 电流 - 灌/拉输出:50mA 频率 - 时钟:400kHz 电压 - 电源:2.3 V ~ 5.5 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 供应商器件封装:24-HVQFN（4x4） 标准包装:1 |
| PCA9539BS-T | 制造商:NXP Semiconductors 功能描述:I2C/SMBus GPIO Expander 5.5V 24-Pin HVQFN EP T/R |
| PCA9539D | 功能描述:接口-I/O扩展器 I2C/SMBUS 16BIT GPIO 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 |
| PCA9539D,112 | 功能描述:接口-I/O扩展器 I2C/SMBUS 16BIT GPIO 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 |
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