PCA9543A_43B 带有中断逻辑和复位的2通道I2C总线开关
PCA9543A/43B/43C是一款双向变换开关，通过I²C总线进行控制。SCL/SDA上游对会扇出两个下游对或通道。可选择任何单独的SCx/SDx通道或通道组合，由可编程控制寄存器的内容决定。提供两个中断输入1和1，每对下游对各一个。提供一个中断输出1，用作两个中断输入的AND。
低电平有效的复位输入允许PCA9543X从某一下游I²C总线卡在低电平状态的情况下恢复。将1引脚拉至低电平会复位I²C总线状态机并使所有通道变为取消选择状态，如同内部上电复位功能。
开关的传递门如此构造，使得VDD引脚可用于限制PCA9543X所传递的最高电压。这允许在各SCx/SDx对上使用不同的总线电压，在没有任何额外保护的情况下使1.8 V、2.5 V或3.3 V部件能够与5 V部件通信。外部上拉电阻将总线上拉至各通道想要的电压电平。所有I/O引脚均为5 V耐受。
除从地址的固定部分外，PCA9543A、PCA9543B和PCA9543C完全相同。
产品特点 Features
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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 |
| PCA9543AD | 9352 758 03118 | PCA9543AD,118 | 量产 | SO14 (SOT108-1) |
| PCA9543AD | 9352 758 03112 | PCA9543AD,112 | 量产 | SO14 (SOT108-1) |
| PCA9543APW | 9352 758 04118 | PCA9543APW,118 | 量产 | TSSOP14 (SOT402-1) |
| PCA9543APW | 9352 758 04112 | PCA9543APW,112 | 量产 | TSSOP14 (SOT402-1) |
| PCA9543BPW | 9352 833 05118 | PCA9543BPW,118 | 量产 | TSSOP16 (SOT403-1) |
订货和供应
| 型号 | 订购码 (12NC) | 可订购的器件编号 | 化学成分 |
| PCA9543AD | 9352 758 03118 | PCA9543AD,118 | PCA9543AD |
| PCA9543AD | 9352 758 03112 | PCA9543AD,112 | PCA9543AD |
| PCA9543APW | 9352 758 04118 | PCA9543APW,118 | PCA9543APW |
| PCA9543APW | 9352 758 04112 | PCA9543APW,112 | PCA9543APW |
| PCA9543BPW | 9352 833 05118 | PCA9543BPW,118 | PCA9543BPW |
PCA9543A_43B 技术支持
| 档案名称 | 标题 | 类型 | 格式 |
| PCA9543A_43B | 2-channel I2C-bus switch with interrupt logic and reset | 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 PCA9543A_43B I2C-bus extender | Application note | |
| 75016527 | Extend standard I2C-bus devices without worrying about offset voltages; NXP I2C-bus extender PCA9543A_43B in a proven application | Brochure | |
| 75016532 | Extend the I2C-bus with advanced repeaters and hubs; NXP 2-channel I2C-bus repeaters PCA9543A_43Bx 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 PCA9543A_43B | 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 |
