PCA9553 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。PCA9553 LED闪烁器只需要初始设置命令对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100 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。
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)。
由于引脚限制,PCA9553不具备硬件地址引脚。PCA9553/01和PCA9553/02具有不同的固定I²C总线地址,允许同时工作在相同总线上
产品特点 Features
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型号 | 可订购的器件编号 | 订购码 (12NC) | 产品状态 | 封装 |
PCA9553D/01 | 9352 728 25118 | PCA9553D/01,118 | 量产 | SO8 (SOT96-1) |
PCA9553D/01 | 9352 728 25112 | PCA9553D/01,112 | 量产 | SO8 (SOT96-1) |
PCA9553DP/01 | 9352 728 26118 | PCA9553DP/01,118 | 量产 | TSSOP8 (SOT505-1) |
PCA9553DP/02 | 9352 728 28118 | PCA9553DP/02,118 | 量产 | TSSOP8 (SOT505-1) |
PCA9553TK | 9352 821 58118 | PCA9553TK,118 | 量产 | HVSON8 (SOT908-1) |
型号 | 订购码 (12NC) | 可订购的器件编号 | 化学成分 |
PCA9553D/01 | 9352 728 25118 | PCA9553D/01,118 | PCA9553D/01 |
PCA9553D/01 | 9352 728 25112 | PCA9553D/01,112 | PCA9553D/01 |
PCA9553DP/01 | 9352 728 26118 | PCA9553DP/01,118 | PCA9553DP/01 |
PCA9553DP/02 | 9352 728 28118 | PCA9553DP/02,118 | PCA9553DP/02 |
PCA9553TK | 9352 821 58118 | PCA9553TK,118 | PCA9553TK |
档案名称 | 标题 | 类型 | 格式 |
PCA9553 | 4-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 PCA9553 I2C-bus extender | Application note | |
75016527 | Extend standard I2C-bus devices without worrying about offset voltages; NXP I2C-bus extender PCA9553 in a proven application | Brochure | |
75016532 | Extend the I2C-bus with advanced repeaters and hubs; NXP 2-channel I2C-bus repeaters PCA9553x 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 PCA9553 | 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 |