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PCA9554PW,118 PCA9554PW
Configuration
1 options
Configuration
Date code within 2 years
Available for RFQ
Technical data
Product details
20
specifications
Core information
- Product name
- NXP PCA9554PW, 118
- Type
- NXP
- Unit
- Electronic Component
- Minimum package
- 2500 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic Component
- NXP
- Electronic Component
- PCA9554PW,118
- Electronic Component
- 1
- Package
- TSSOP-16
- Electronic Component
- I / O Expander
- Electronic Component
- 0.168g
- Electronic Component
- 1
- I / O
- 8
- Features
- positions; and
- Electronic Component
- BM0257638415
- Operating Temperature
- 40℃~+85℃
- Operating Voltage
- 2.3V~5.5V
- Interface Type
- I2C；SMBus
- Current(IOH)
- 10mA
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
PCA9554PW,118 产品概述
PCA9554PW,118 是 NXP（恩智浦）推出的一款低功耗 8 位 I/O 扩展器，采用 TSSOP-16 封装，支持 I2C 与 SMBus 总线通讯。器件适配电源电压范围 2.3V ～ 5.5V，工作温度范围 -40℃ ～ +85℃，可为微控制器提供额外的并行 I/O 口，适用于工业控制、消费电子与便携式设备等场景。
一、主要特性
- 8 位通用 I/O 口，可独立配置为输入或输出。
- I2C / SMBus 接口，支持最高时钟频率 400 kHz（Fast-mode）。
- 器件地址位允许级联最多 8 个相同设备，扩展更大 I/O 数量。
- 具有中断输出，便于事件驱动的输入检测，减少轮询开销。
- 工作电压范围广：2.3V ～ 5.5V，适配多种系统电压。
- 极低静态电流 Iq：约 250 nA，适合电池供电与低功耗设计。
- 封装：TSSOP-16（PCA9554PW,118）。
二、电气性能要点
- 下拉导通能力（IOL，sink）：24 mA（单引脚承受下拉负载能力）。
- 上拉输出能力（IOH，source）：10 mA（单引脚源电流能力）。
- 输出电平：输出高电平 VOH 指标可达到 4.0 V（视 VCC 与负载而定）；输出低电平 VOL 约 500 mV（在指定 IOL 下）。
- 时钟频率上限 400 kHz，兼容 SMBus。
这些参数在实际设计中需结合 PCB 散热与总线阻抗考虑，不宜长期将各引脚推到极限电流。
三、功能与寄存器概览
PCA9554 通常提供几类寄存器：输入端口寄存器、输出端口寄存器、极性反转寄存器与配置寄存器（方向控制）。通过 I2C 读写这些寄存器可以读取输入状态、设定输出、反转逻辑或配置某位为输入/输出，从而实现灵活的 I/O 管理。中断口在检测到配置的输入变化后可触发主机响应，降低系统轮询负担。
四、典型应用
- MCU I/O 扩展：在管脚有限的单片机上扩展按键、开关、指示灯等控制线。
- 键盘扫描、工控信号采集与驱动低电流负载（继电器或 MOSFET 驱动需外接驱动器）。
- 电池设备：凭借超低静态电流，适用于长待机的便携或远程终端。
五、设计建议
- I2C 总线需使用合适阻值的上拉电阻（常见 4.7kΩ ～ 10kΩ），根据总线容量与速度调整。
- 在 VCC 旁并联 0.1 µF 陶瓷去耦电容以保证稳定性与瞬态响应。
- 若需驱动高电流或感性负载，应在 I/O 端增加外部驱动与保护；注意 VOH/VOL 在大电流时会下降。
- 中断输出常用为开漏/开集电极结构（需外部上拉），建议在 MCU 侧配置中断输入并加滤抖处理。
- 多器件级联时，注意 I2C 地址配置与总线负载，确保时钟与数据线的信号完整性。
PCA9554PW,118 提供简单可靠的 8 位 I/O 扩展能力，低功耗与宽电压特性使其在多种系统中易于集成，是常见的微控制器外设扩展选择。若需更详细的时序、寄存器描述与典型电路图，请参阅 NXP 官方数据手册。
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