PCA9646 经过缓冲的4通道2线总线开关
PCA9646是一款单片CMOS集成电路，适用于I²C总线、SMBus、PMBus及其他基于类似原理的系统应用中的2线总线缓冲和切换。
可按任何组合独立启用各四个输出，由可编程控制寄存器的内容决定。每个I/O的阻抗均与所有其他I/O隔离，因此允许总共五个带有最大指定负载的2线总线分支（例如，1 MHz时的Fm+ I²C总线为5 × 400 pF，或在更低频率时为5 × 4 nF）（参考1）。可串联使用多个PCA9646，提供强大的扇出能力。
类似PCA9525和PCA9605简易总线缓冲器，PCA9646附带用于时钟信号的单向缓冲器和用于数据信号的双向缓冲器。可通过可编程控制寄存器的内容设置时钟信号的方向。时钟展宽和定时必须始终由主器件控制。
PCA9646极其适合2线总线地址扩展和增加最大负载电容。超大型LED显示是完美的示例。
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 |
| PCA9646D | 9352 927 09118 | PCA9646D,118 | 量产 | SO16 (SOT109-1) |
| PCA9646PW | 9352 927 49118 | PCA9646PW,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 |
| PCA9646D | 9352 927 09118 | PCA9646D,118 | PCA9646D |
| PCA9646PW | 9352 927 49118 | PCA9646PW,118 | PCA9646PW |
PCA9646 技术支持
| 档案名称 | 标题 | 类型 | 格式 |
| PCA9646 | Buffered 4-channel 2-wire bus switch | 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 PCA9646 I2C-bus extender | Application note | |
| 75016527 | Extend standard I2C-bus devices without worrying about offset voltages; NXP I2C-bus extender PCA9646 in a proven application | Brochure | |
| 75016532 | Extend the I2C-bus with advanced repeaters and hubs; NXP 2-channel I2C-bus repeaters PCA9646x 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 PCA9646 | 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 |
