PCA8574AD 带有中断的I2C总线远程8位I/O扩展器
PCA8574/74A通过两路双向I²C总线（串行时钟(SCL)、串行数据(SDA)）为大多数微控制器系列提供通用远程I/O扩展。
器件由8位准双向端口和I²C总线接口组成。PCA8574/74A具有低电流消耗且包含具备25 mA高电流驱动能力的锁存输出，用于直接驱动LED。
PCA8574/74A还具有中断线路(1)，可连接至微控制器的中断逻辑。通过在此线路发送中断信号，远程I/O可通知微控制器其端口上是否存在输入数据而无需通过I²C总线通信。
内部上电复位(POR)会将I/O初始化为输入。
产品特点 Features
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应用
功能框图
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封装
| 型号 | 可订购的器件编号 | 订购码 (12NC) | 产品状态 | 封装 |
| PCA8574AD | 9352 834 89512 | PCA8574AD,512 | 量产 | SO16 (SOT162-1) |
| PCA8574AD | 9352 834 89518 | PCA8574AD,518 | 量产 | SO16 (SOT162-1) |
订货和供应
| 型号 | 订购码 (12NC) | 可订购的器件编号 | 化学成分 |
| PCA8574AD | 9352 834 89512 | PCA8574AD,512 | PCA8574AD |
| PCA8574AD | 9352 834 89518 | PCA8574AD,518 | PCA8574AD |
PCA8574AD 技术支持
| 档案名称 | 标题 | 类型 | 格式 |
| PCA8574AD | Remote 8-bit I/O expander for I2C-bus with interrupt | Data sheet | |
| AN10441 | Level shifting techniques in I2C-bus design | Application note | |
| AN255 | I2C / SMBus Repeaters, Hubs and Expanders | Application note | |
| AN10710 | Features and applications of the PCA8574_74A I2C-bus extender | Application note | |
| 75016527 | Extend standard I2C-bus devices without worrying about offset voltages; NXP I2C-bus extender PCA8574_74A in a proven application | Brochure | |
| 75016532 | Extend the I2C-bus with advanced repeaters and hubs; NXP 2-channel I2C-bus repeaters PCA9515x and 5-channel I2C-bus hubs PCA9516x | Leaflet | |
| 75016080 | Extend the reach of any I2C-bus system without special offset voltage levels; NXP I2C-bus extender PCA8574_74A | Leaflet | |
| 75017424 | NXP I2C-bus solutions 2013: Smart, simple solutions for the 12 most common design concerns | Leaflet | |
| UM10204 | I2C-bus specification and user manual | User manual | |
| UM10206 | I2C Demonstration Board 2005-1 Quick Start Guide | User manual | |
| UM10323 | PCA9600 demonstration board OM6293 | User manual |
