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PCA9555BS,118 PCA9555BS
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
15
specifications
Core information
- Product name
- NXP PCA9555BS, 118
- Type
- NXP
- Minimum package
- 6000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- NXP
- Electronic Component
- PCA9555BS,118
- Electronic Component
- 1
- Package
- HVQFN-24-EP(4x4)
- Electronic Component
- I / O Expander
- Electronic Component
- 0.126g
- Electronic Component
- 1
- Features
- positions; and
- Electronic Component
- BM0249882643
- Electronic Component
- Electronic Component
- Electronic Component
- 6000
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
PCA9555BS,118 产品概述
一、产品简介
PCA9555BS,118 是恩智浦（NXP）推出的一款 16 位 I²C/SMBus I/O 扩展器，支持最高 400 kHz 的快速模式通信。器件将两个 8 位并行端口整合在一颗芯片上，通过简单的 I²C 总线即可扩展 MCU 的 GPIO 数量，适用于需要大量通用输入/输出但主控引脚有限的场合。
二、主要功能和特点
- 16 路独立可编程 I/O：每一路可独立配置为输入或输出，方向通过方向寄存器设置。
- I²C/SMBus 接口：兼容标准模式和快速模式，最高支持 400 kHz。
- 级联与地址扩展：器件提供地址选择引脚，可通过硬件地址线串联多达 8 片器件，从而扩展最多 128 路 I/O。
- 复位功能：支持硬件复位，使寄存器恢复到默认状态，便于系统初始化与故障恢复。
- 中断输出（开漏、低有效）：当任一路输入状态变化时可触发中断，降低轮询开销并提高响应效率。
- 极性翻转与寄存器访问：提供输入/输出寄存器、方向寄存器和极性翻转寄存器，便于软件灵活控制和判断引脚电平。
三、硬件接口与封装
PCA9555BS,118 采用 HVQFN-24-EP（4 x 4 mm）封装，带散热裸露焊盘，便于 PCB 散热与可靠焊接。器件通常工作电压范围宽（约 2.3 V 至 5.5 V），适配多电压系统。封装尺寸小且引脚排布紧凑，适合空间受限的嵌入式与消费类产品。
四、寄存器与使用要点
器件通过一组寄存器实现 I/O 管脚控制：输入端口寄存器、输出端口寄存器、方向寄存器和极性翻转寄存器。典型使用流程为配置方向→写输出→读取输入/监测中断。中断为开漏输出，应外接上拉至系统电源；复位后寄存器回到默认值，软件应在启动时完成必要的初始化配置。
五、典型应用场景
适用于键盘扫描、背光或指示灯驱动、按键矩阵、传感器信号采集、服务器与通信设备的远程 I/O 扩展，以及工业控制和家电等需要大规模 GPIO 扩展的场景。
六、设计与选型建议
在选型时关注总线地址规划（避免地址冲突）、上拉电阻值与中断线的负载能力，以及封装散热要求。若系统对瞬态保护有要求，建议在 I/O 线上添加限流或 TVS 器件。对于多片级联使用，应评估总线容量与上拉电阻对通信速度的影响。
总体而言，PCA9555BS,118 以其 16 路灵活可编程 I/O、快速 I²C 通信、级联扩展能力及小型 HVQFN 封装，为空间受限且需大量 GPIO 的设计提供了成熟可靠的扩展方案。
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