WMSIC Electronic Components

PCA9548AD,118 PCA9548AD

ModelPCA9548AD,118
Package24-SO
BrandNXP
Price Price on request Electronic component prices change quickly with market supply and demand. Please refer to the latest WMSIC quotation for current pricing.
Configuration
1 options
Configuration 24+

Available for RFQ

Technical data

Product details

17 specifications

Core information

Product name
NXP PCA9548AD, 118
Type
NXP
Minimum package
1000 圆盘

Technical parameters

Electronic Component
Electronic Component
Electronic Component
NXP
Electronic Component
PCA9548AD,118
Electronic Component
1
Package
24-SO
Electronic Component
Other Interface
Electronic Component
0.996g
Electronic Component
1
Features
positions
Electronic Component
BM0257709515
Operating Voltage
2.3V~3.6V
Interface Type
I2C;SMBus
Electronic Component
Electronic Component
Electronic Component
1000

For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.

PCA9548AD,118 产品概述

一、产品简介

PCA9548AD,118 是恩智浦(NXP)推出的多路 I²C/SMBus 转换开关(I²C 多路复用器),封装为 24-SO 表面贴装型,常用于在单一主机总线上选择或隔离多个从机总线。器件通过写入控制寄存器来选择通道,支持灵活的总线划分与地址冲突解决。型号后缀 “,118” 通常表示特定的包装与供货代码(例如卷盘包装)。

二、主要参数(基于提供信息)

  • 供电电压:可供货的电压区间包括 2.3 V ~ 3.6 V 和 4.5 V ~ 5.5 V(请按具体订购型号确认对应工作电压)。
  • 安装类型:表面贴装(SMD)
  • 接口:I²C,SMBus 兼容
  • 应用:转换开关 / I²C 多路复用
  • 封装:24 引脚 SO(表面贴装)
  • 品牌:NXP(恩智浦)

三、功能与工作原理

PCA9548A 系列通过一个可写入的控制寄存器控制最多八个下游通道(各通道对应一个位),可以同时打开一个或多个通道以将主总线与选定的从总线连接或隔离。每个通道在逻辑上隔离下游设备,从而解决从设备地址冲突、减小总线电容并提高系统鲁棒性。器件为开漏总线结构,需在每个总线侧配置上拉电阻。

四、典型应用场景

  • 多个从设备地址冲突时进行地址复用或隔离;
  • 将多个传感器或外设按功能划分到独立子总线(便于故障定位与电源管理);
  • 多主机系统中对从设备分时访问的总线管理;
  • 需要减少主总线负载或避免某些外设影响总线稳定性的场合。

五、设计要点与注意事项

  • 上拉电阻:主总线和各下游总线均需合适的上拉电阻,阻值应根据总线容量与工作速率调整;
  • 电源与电平:器件本身不做电平位移,所有相关 I/O 电平应与器件 VCC 兼容;若系统存在不同电平域,应另行加入电平转换器;
  • 地址规划:器件带有可选地址引脚(请参照数据手册)以在主总线上实现多个 PCA9548A 并存;
  • 通道切换:软件通过 I²C 写指令切换通道,需处理好切换时的未完成事务与时序问题,避免总线竞争;
  • 包装与散热:24-SO 封装适合表面贴装生产,注意焊接工艺与 PCB 布局的热和地平面要求。

六、建议与结论

PCA9548AD,118 适合需要扩展或隔离 I²C/SMBus 从设备的中高端嵌入式系统,尤其在传感器阵列、工业控制和多外设管理场景中能显著简化硬件与固件设计。使用前建议参阅 NXP 官方数据手册与器件选型表,确认所购型号的准确工作电压与引脚定义,并按数据手册推荐的上拉电阻与 PCB 布局规范完成设计。

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