PCA9554和PCA9554A是16引脚CMOS器件,为I²C总线/SMBus应用提供8位通用并行输入/输出(GPIO)扩展,是为增强NXP Semiconductors的I²C总线I/O扩展器系列而开发的。改进内容包括更高的驱动能力、5 V I/O容限、更低的供电电流、独立的I/O配置、400 kHz时钟频率和更小的封装。ACPI电源开关、传感器、按钮、LED、风扇等需要额外的I/O时,I/O扩展器提供简易的解决方案。
PCA9554/PCA9554A由8位配置寄存器(输入或输出选择)、8位输入端口寄存器、8位输出端口寄存器和8位极性反转寄存器(高电平有效或低电平有效操作)组成。系统主器件可通过写入I/O配置位将I/O用作输入或输出。每个输入或输出的数据保留在对应的输入端口或输出端口寄存器中。通过极性反转寄存器可反转读取寄存器的极性。系统主器件可读取所有寄存器。虽然引脚对引脚和I²C总线地址都兼容PCF8574系列,但是因增强功能而需要软件更改,这在应用注意事项AN469中讨论。
当任何输入状态与其对应的输入端口寄存器状态不同时,会激活PCA9554/PCA9554A开漏中断输出并用于通知系统主器件输入状态已改变。上电复位会将寄存器设为其默认值并初始化器件状态机。
三个硬件引脚(A0、A1、A2)会改变固定I²C总线地址,因而允许最多八个器件共享相同的I²C总线/SMBus。除允许相同I²C总线/SMBus上存在最多十六个这些器件(各八个)的固定I²C总线地址不同外,PCA9554A与PCA9554完全相同。
产品特点 Features
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功能框图 |
型号 | 可订购的器件编号 | 订购码 (12NC) | 产品状态 | 封装 |
PCA9554ABS | 9352 720 03118 | PCA9554ABS,118 | 量产 | HVQFN16 (SOT629-1) |
PCA9554ABS3 | 9352 830 49118 | PCA9554ABS3,118 | 量产 | HVQFN16 (SOT629-1) |
PCA9554AD | 9352 691 95118 | PCA9554AD,118 | 量产 | SO16 (SOT109-1) |
PCA9554AD | 9352 691 95112 | PCA9554AD,112 | 量产 | SO16 (SOT109-1) |
PCA9554ADB | 9352 692 01118 | PCA9554ADB,118 | 量产 | SSOP16 (SOT338-1) |
PCA9554ADB | 9352 692 01112 | PCA9554ADB,112 | 量产 | SSOP16 (SOT338-1) |
PCA9554APW | 9352 692 02118 | PCA9554APW,118 | 量产 | TSSOP16 (SOT403-1) |
PCA9554APW | 9352 692 02112 | PCA9554APW,112 | 量产 | TSSOP16 (SOT403-1) |
PCA9554ATS | 9352 767 72118 | PCA9554ATS,118 | 量产 | SSOP20 (SOT266-1) |
PCA9554ATS | 9352 767 72112 | PCA9554ATS,112 | 量产 | SSOP20 (SOT266-1) |
PCA9554BS | 9352 719 79118 | PCA9554BS,118 | 量产 | HVQFN16 (SOT629-1) |
PCA9554BS3 | 9352 830 51118 | PCA9554BS3,118 | 量产 | HVQFN16 (SOT629-1) |
PCA9554D | 9352 691 92118 | PCA9554D,118 | 量产 | SO16 (SOT109-1) |
PCA9554D | 9352 691 92112 | PCA9554D,112 | 量产 | SO16 (SOT109-1) |
PCA9554DB | 9352 691 93112 | PCA9554DB,112 | 量产 | SSOP16 (SOT338-1) |
PCA9554DB | 9352 691 93118 | PCA9554DB,118 | 量产 | SSOP16 (SOT338-1) |
PCA9554PW | 9352 691 94118 | PCA9554PW,118 | 量产 | TSSOP16 (SOT403-1) |
PCA9554PW | 9352 691 94112 | PCA9554PW,112 | 量产 | TSSOP16 (SOT403-1) |
PCA9554PW/DG | 9352 858 96118 | PCA9554PW/DG,118 | 量产 | TSSOP16 (SOT403-1) |
PCA9554PW/Q900 | 9352 946 94118 | PCA9554PW/Q900,118 | 量产 | TSSOP16 (SOT403-1) |
PCA9554TS | 9352 767 71118 | PCA9554TS,118 | 量产 | SSOP20 (SOT266-1) |
PCA9554TS | 9352 767 71112 | PCA9554TS,112 | 量产 | SSOP20 (SOT266-1) |
PCA9554U | 9352 795 64029 | PCA9554U,029 |
型号 | 订购码 (12NC) | 可订购的器件编号 | 化学成分 |
PCA9554ABS | 9352 720 03118 | PCA9554ABS,118 | PCA9554ABS |
PCA9554ABS3 | 9352 830 49118 | PCA9554ABS3,118 | PCA9554ABS3 |
PCA9554AD | 9352 691 95118 | PCA9554AD,118 | PCA9554AD |
PCA9554AD | 9352 691 95112 | PCA9554AD,112 | PCA9554AD |
PCA9554ADB | 9352 692 01118 | PCA9554ADB,118 | PCA9554ADB |
PCA9554ADB | 9352 692 01112 | PCA9554ADB,112 | PCA9554ADB |
PCA9554APW | 9352 692 02118 | PCA9554APW,118 | PCA9554APW |
PCA9554APW | 9352 692 02112 | PCA9554APW,112 | PCA9554APW |
PCA9554ATS | 9352 767 72118 | PCA9554ATS,118 | PCA9554ATS |
PCA9554ATS | 9352 767 72112 | PCA9554ATS,112 | PCA9554ATS |
PCA9554BS | 9352 719 79118 | PCA9554BS,118 | PCA9554BS |
PCA9554BS3 | 9352 830 51118 | PCA9554BS3,118 | PCA9554BS3 |
PCA9554D | 9352 691 92118 | PCA9554D,118 | PCA9554D |
PCA9554D | 9352 691 92112 | PCA9554D,112 | PCA9554D |
PCA9554DB | 9352 691 93112 | PCA9554DB,112 | PCA9554DB |
PCA9554DB | 9352 691 93118 | PCA9554DB,118 | PCA9554DB |
PCA9554PW | 9352 691 94118 | PCA9554PW,118 | PCA9554PW |
PCA9554PW | 9352 691 94112 | PCA9554PW,112 | PCA9554PW |
PCA9554PW/DG | 9352 858 96118 | PCA9554PW/DG,118 | PCA9554PW/DG |
PCA9554PW/Q900 | 9352 946 94118 | PCA9554PW/Q900,118 | PCA9554PW/Q900 |
PCA9554TS | 9352 767 71118 | PCA9554TS,118 | PCA9554TS |
PCA9554TS | 9352 767 71112 | PCA9554TS,112 | PCA9554TS |
PCA9554U | 9352 795 64029 | PCA9554U,029 | PCA9554U |
档案名称 | 标题 | 类型 | 格式 |
PCA9554_9554A | 8-bit I2C-bus and SMBus I/O port with interrupt | 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 PCA9554_9554A I2C-bus extender | Application note | |
75016527 | Extend standard I2C-bus devices without worrying about offset voltages; NXP I2C-bus extender PCA9554_9554A in a proven application | Brochure | |
75016532 | Extend the I2C-bus with advanced repeaters and hubs; NXP 2-channel I2C-bus repeaters PCA9554_9554Ax 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 PCA9554_9554A | 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 |