WMSIC Electronic Components

PCA9518APW,518 PCA9518APW

ModelPCA9518APW,518
Package20-TSSOP
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 25+

Available for RFQ

Technical data

Product details

16 specifications

Core information

Product name
NXP PCA9518APW, 518
Type
NXP
Minimum package
2500 圆盘

Technical parameters

Electronic Component
Electronic Component
Electronic Component
NXP
Electronic Component
PCA9518APW,518
Electronic Component
1
Package
20-TSSOP
Electronic Component
Other Interface
Electronic Component
2.555g
Electronic Component
1
Electronic Component
BM0262715413
Operating Voltage
3V~3.6V
Interface Type
I2C;SMBus
Electronic Component
Electronic Component
Electronic Component
2500

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

PCA9518APW,518 产品概述

一、简介

PCA9518APW,518 是恩智浦(NXP)提供的一款用于 I2C/SMBus 总线的接口缓冲器,封装为 20 引脚 TSSOP(20-TSSOP),工作电压范围为 3.0V 至 3.6V。该器件定位于在系统中对 I2C/SMBus 线路进行分隔与缓冲,改善信号完整性、扩展总线长度与负载能力,同时保持对标准 I2C/SMBus 协议的兼容性,便于在复杂系统中实现可靠的总线连接与多段管理。

二、功能与特点

  • 专为 I2C/SMBus 设计的双向缓冲/分隔器,透明处理 SDA/SCL 信号,保留开漏(open-drain)特性;
  • 支持在系统中分割总线段,降低每段的等效电容,提高驱动能力与稳定性;
  • 20-TSSOP 紧凑封装,便于在 PCB 上密集布局与工业级产品化;
  • 核心工作电压为 3.0V–3.6V,与 3.3V 系统直接兼容,便于与主流微控制器、传感器与管理控制器集成;
  • 兼容 SMBus 与 I2C 标准,适配常见工作模式下的时序与握手机制。

三、典型应用场景

  • 嵌入式主板与板间总线延伸(长线或多模块系统);
  • 数据中心与服务器管理(BMC/SMBus 设备隔离与拓扑优化);
  • 工业控制与自动化设备的多节点传感器网络;
  • 电源管理、PMIC 与电池管理系统中对 SMBus 的隔离与信号保护;
  • 多主机或多段扩展的总线架构,用于提高系统可靠性和故障隔离能力。

四、设计与使用建议

  • 拉拔电阻(pull-up):在每个分段适当配置上拉电阻,避免总线两端重复上拉导致功耗或时序异常;上拉阻值应依据总线电容、速率与功耗目标选择;
  • 去耦与电源滤波:靠近器件放置合适的去耦电容(例如 0.01–0.1µF)以确保稳压,降低干扰敏感度;
  • 布线与阻抗:SCL/SDA 线尽量短且走直线,必要时并入串联阻容以抑制反射与振铃;分段缓冲器放置在需隔离的段之间;
  • 多器件串联:如需多级分隔,遵循厂商建议的拓扑与数量限制,防止引入过多的延迟或影响握手;
  • 调试策略:若出现应答异常,先检查上拉电阻、供电电压是否在 3.0–3.6V 范围、以及总线电容是否超标;示波器观测 SDA/SCL 波形有助定位问题。

五、优势概述

PCA9518APW,518 以稳健的缓冲与隔离能力,解决 I2C/SMBus 在复杂系统中常见的负载、长度与信号完整性问题。其 20-TSSOP 小封装与 3.3V 兼容性,使其易于集成到各类嵌入式与工业设计中,同时保持对 SMBus/I2C 协议的透明支持,适合用于提升系统拓扑的可扩展性与可靠性。

总结:对于需要延长总线、分段隔离或提升多设备互连稳定性的设计,PCA9518APW,518 提供了实用且高集成度的解决方案。在设计中合理配置上拉、去耦与布线,可最大限度发挥其性能,提升整机可靠性与总线可维护性。

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