数据手册DataSheet 下载：PCA9550DP 2位I2C总线LED驱动器，具有可编程闪烁速率.pdf

PCA9550 LED闪烁器可在I²C总线和SMBus应用中闪烁LED，而在这些应用中有必要限制总线流量或释放I²C主机（MCU、MPU、DSP、芯片组等）定时器。该器件的独特之处是集成内部振荡器，提供两种可编程闪烁速率。若要使用普通的I/O扩展器（如PCF8574或PCA9554）闪烁LED，则总线主机必须发送重复命令，开启和关闭LED。这可极大地增加I²C总线上的流量，并耗尽主机的其中一个定时器。而PCA9550 LED闪烁器仅需初始设置命令便可编程闪烁速率1和闪烁速率2（如频率和占空比）。在此之后，只需总线主机发出一条命令，便可开启或关闭各开漏输出，或者在闪烁速率1或闪烁速率2之间循环切换。最大输出吸电流为每位25 mA，以及每封装50 mA。

任何未用于控制LED的位都可用作通用并行输入/输出(GPIO)扩展。

低电平有效硬件复位针脚(RESET)和上电复位(POR)可将寄存器初始化为它们的默认状态（全零），使位变为高电平（LED关闭）。

PCA9550上的一个硬件地址针脚允许在一条总线上运行两个器件。

产品特点
  • 2个LED驱动器（开、关、闪光速率可编程）
  • 2个可选、完全可编程闪烁速率（频率和占空比）范围为0.172 Hz至44 Hz（5.82 s和0.023 s）
  • 未用作LED驱动器的输入/输出可用作常规GPIO
  • 集成内部振荡器，无需外部元件
  • I²C总线接口逻辑兼容SMBus
  • 内部上电复位
  • SCL/SDA输入端提供噪音滤波器
  • 低电平有效复位输入
  • 2个开漏输出直接驱动LED至25 mA
  • 受控边沿速率可最大程度降低接地反弹
  • 上电时无干扰
  • 支持热插拔
  • 低待机电流
  • 电源电压工作范围：2.3 V至5.5 V
  • 时钟频率：0 kHz至400 kHz
  • ESD保护：超过2000 V HBM（符合JESD22-A114标准），超过150 V MM（符合JESD22-A115标准）以及超过1000 V CDM（符合JESD22-C101标准）
  • 已完成JEDEC标准JESD78闩锁测试（超过100 mA）
  • 封装类型：SO8、TSSOP8 (MSOP8)、HVSON8
功能框图
演示板
订购型号
订购型号封装Outline versionReflow-/Wave soldering包装产品状态标示订购器件的编号
PCA9550DPTSSOP8 (SOT505-1)sot505-1_poReflow_Soldering_Profile
Wave_Soldering_Profile		Reel Pack, SMD, 13" Q1/T1激活9550PCA9550DP,118( 9352 728 81118 )
品质、可靠性及RoHS化学成分
订购型号订购器件的编号RoHS / RHF无铅开始日期EFRIFR (FIT)MTBF（小时）潮湿敏感度等级MSL LF
PCA9550DPPCA9550DP,118week 12, 20050.02.05E811
产品技术资料
文档标题类型分类格式更新日期
PCA9550 (中文)：2-bit I2C-bus LED driver with programmable blink ratesData sheetpdf2008-10-13
AN10441：Level shifting techniques in I2C-bus designApplication notepdf2007-06-20
AN10146：I2C 2002-1A Evaluation BoardApplication notepdf2003-02-26
AN264：I2C Devices for LED Display ControlApplication notepdf2002-07-22
75016543：Create smarter, more efficient white goods; An industry-leading portfolio of cost-effective, power-saving solutions for major home appliancesBrochurepdf2008-06-01
75017588：LED controllers: Voltage-switch drivers, constant-current drivers, and Flash LED driversBrochurepdf2014-07-03
75016531：Evaluate the I2C-bus with a comprehensive kit; NXP I2C 2002-1A evaluation board kits OM6285 and OM6278Leafletpdf2008-07-01
75016021：LED blinking with GPIO expansion; NXP 2/4/8/16-bit I2C/SMBus LED blinkers PCA9550/51/52/53Leafletpdf2007-06-01
75017424：NXP I2C-bus solutions 2013: Smart, simple solutions for the 12 most common design concernsLeafletpdf2013-05-23
design_con_2003_tecforum_i2c_bus_overview：DesignCon 2003 TecForum I 2 C Bus OverviewOther typepdf2003-01-27
UM10204：I2C-bus specification and user manualUser manualpdf2014-04-28
UM10206：I2C Demonstration Board 2005-1 Quick Start GuideUser manualpdf2006-06-12
UM10317：PCA9633 demonstration board OM6282User manualpdf2008-12-15
UM10204_JA：I2C-bus specification and user manualUser manualpdf2013-04-03
SOT505-1_118：TSSOP8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118Packingpdf2013-04-15
Reflow_Soldering_Profile：Reflow Soldering ProfileReflow solderingpdf2013-09-30
Wave_Soldering_Profile：Wave Soldering ProfileWave solderingpdf2013-09-30
SSOP-TSSOP-VSO-WAVE：Footprint for wave solderingWave solderingpdf2009-10-08
sot505-1_po：plastic thin shrink small outline package; 8 leads; body width 3 mmOutline drawingpdf2009-10-08
sot505-1_fr：Footprint for reflow soldering SOT505-1Reflow solderingpdf2010-07-20
2-bit I2C-bus LED driver with programmable blink rates PCA9550
Level shifting techniques in I2C-bus design pca9685pw
I2C 2002-1A Evaluation Board lm75a
I2C Devices for LED Display Control PCA9553
I2C-bus specification and user manual pca9685pw
I2C-bus specification and user manual pca9685pw
PCA9633 demonstration board OM6282 pca9685pw
I2C Demonstration Board 2005-1 Quick Start Guide pca9685pw
NXP® I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns pca9685pw
LED controllers: Voltage-switch drivers, constant-current drivers, and Flash LED drivers pca9685pw
Evaluate the I2C-bus with a comprehensive kit; NXP® I2C 2002-1A evaluation board kits OM6285 and OM6278 lm75a
Create smarter, more efficient white goods; An industry-leading portfolio of cost-effective, power-saving solutions for... PMEG6010CE_AUTOMOTIVE
LED blinking with GPIO expansion; NXP® 2/4/8/16-bit I2C/SMBus LED blinkers PCA9550/51/52/53 PCA9553
design_con_2003_tecforum_i2c_b_1 lm75a
PCA9550 IBIS model PCA9550DP
plastic thin shrink small outline package; 8 leads; body width 3 mm pesd5v0l7bas
Reflow_Soldering_Profile Wave_Soldering_Profile LPC1112FD20
TSSOP8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... pesd5v0l7bas
PCA9550
PCT2075
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