PCA9552 带有可编程闪烁速率的16位I2C总线LED驱动器
PCA9552 LED闪烁器会使I²C总线和SMBus应用的LED闪烁，此类应用中需要限制总线通信量或释放I²C总线主器件（MCU、MPU、DSP、芯片组等等）的定时器。此器件的独特性在于内部振荡器带有两个可编程闪烁速率。要使用类似PCF8574或PCA9554等普通I/O扩展器使LED闪烁，则总线主器件必须发送重复的命令以打开或关闭LED。这会极大地增加I²C总线上的通信量并将占用一个主器件的定时器。PCA9552 LED闪烁器只需要初始设置命令对每位输出的BLINK RATE 1和BLINK RATE 2（即频率和占空比）进行编程。从此，只需总线主器件的一个命令即可将每一个开漏输出打开、关闭或者按BLINK RATE 1或BLINK RATE 2的值循环。每位的最大输出灌电流为25 mA，每封装为200 mA。
任何不用于控制LED的位均可用作通用并行输入/输出(GPIO)扩展。
低电平有效的硬件复位引脚(1)和上电复位(POR)会将各寄存器初始化为其默认状态（全零），使各位设为高电平（LED关）。
PCA9552上的三个硬件地址引脚允许八个器件工作在相同总线上。
产品特点 Features
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功能框图
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封装
| 型号 | 可订购的器件编号 | 订购码 (12NC) | 产品状态 | 封装 |
| PCA9552BS | 9352 723 96118 | PCA9552BS,118 | 量产 | HVQFN24 (SOT616-1) |
| PCA9552D | 9352 723 95118 | PCA9552D,118 | 量产 | SO24 (SOT137-1) |
| PCA9552D | 9352 723 95112 | PCA9552D,112 | 量产 | SO24 (SOT137-1) |
| PCA9552PW | 9352 723 94118 | PCA9552PW,118 | 量产 | TSSOP24 (SOT355-1) |
| PCA9552PW | 9352 723 94112 | PCA9552PW,112 | 量产 | TSSOP24 (SOT355-1) |
订货和供应
| 型号 | 订购码 (12NC) | 可订购的器件编号 | 化学成分 |
| PCA9552BS | 9352 723 96118 | PCA9552BS,118 | PCA9552BS |
| PCA9552D | 9352 723 95118 | PCA9552D,118 | PCA9552D |
| PCA9552D | 9352 723 95112 | PCA9552D,112 | PCA9552D |
| PCA9552PW | 9352 723 94118 | PCA9552PW,118 | PCA9552PW |
| PCA9552PW | 9352 723 94112 | PCA9552PW,112 | PCA9552PW |
PCA9552 技术支持
| 档案名称 | 标题 | 类型 | 格式 |
| PCA9552 | 16-bit I2C-bus LED driver with programmable blink rates | 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 PCA9552 I2C-bus extender | Application note | |
| 75016527 | Extend standard I2C-bus devices without worrying about offset voltages; NXP I2C-bus extender PCA9552 in a proven application | Brochure | |
| 75016532 | Extend the I2C-bus with advanced repeaters and hubs; NXP 2-channel I2C-bus repeaters PCA9552x 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 PCA9552 | 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 |
