PCA9509D: 电平转换I²C总线/SMBus中继器

PCA9509是一款电平转换I²C总线/SMBus中继器,它允许处理器低压双线式串行总线连接标准I²C总线或SMBus I/O。在电平转换过程中保留I²C总线系统的所有操作模式和特性的同时,它还允许延伸I²C总线,方法是为数据(SDA)和时钟(SCL)线路提供双向缓冲,从而使能较高电压侧的I²C总线或SMBus最大电容400 pF。端口A允许的电压范围为1.35 V至VCC(B) ‑ 1.0 V,由于其内部具有电流源,因此无需外部上拉电阻。端口B允许的电压范围为3.0 V至5.5 V并且可耐受过压。当PCA9509未上电时,端口A和端口B上的SDA和SCL引脚为高阻抗。

对于其端口A VCC(A)少于1.35 V或端口 B VCC(B)少于3.0 V的应用,请使用简易替代产品PCA9509A。

当端口A使用电流感应机制来检测输入或输出低电平信号(防止总线锁存)时,总线端口B驱动器符合SMBus I/O电平。端口A使用1 mA上拉电流源和200 Ω下拉驱动器。这导致端口A上为低电平,从而适合于较小的电压摆幅。将内部缓冲器的输入阈值设为约比电平输出电压阈值低50 mV时,端口A上的低电平内部缓冲器输出下拉电压设为约0.2 V。当从内部将端口A I/O驱动至低电平时,输入不会将低电平识别为低电平。这可防止发生锁存情况。端口B上的输出下拉电阻驱动硬低压且输入电平将被设为SMBus或I²C总线电压电平的0.3,这将使端口B连接至任何其他I²C总线器件或缓冲器。

在VCC(A)高于0.8 V且VCC(B)高于2.5 V之前,PCA9509驱动器不会使能。使能(EN)引脚还可用于在系统控制下打开和关闭驱动器。请注意,仅当总线空闲时才会更改EN引脚的状态。

0 Hz至400 kHz时钟频率

备注:由于中继器增加的延迟,最大系统工作频率可能少于400 kHz。
PCA9509D: 产品结构框图
sot096-1_3d
数据手册 (1)
名称/描述Modified Date
Level translating I2C-bus/SMBus repeater (REV 7.0) PDF (302.0 kB) PCA9509 [English]04 Nov 2014
应用说明 (3)
名称/描述Modified Date
PCA9500/PCA9501 provides simple card maintenance and control using I²C-bus (REV 1.0) PDF (90.0 kB) AN256 [English]23 Mar 2009
Level shifting techniques in I2C-bus design (REV 1.0) PDF (52.0 kB) AN10441 [English]20 Jun 2007
I2C / SMBus Repeaters, Hubs and Expanders (REV 2.0) PDF (1.0 MB) AN255 [English]19 Dec 2002
用户指南 (4)
名称/描述Modified Date
I2C-bus specification and user manual (REV 6.0) PDF (1.4 MB) UM10204 [English]28 Apr 2014
I2C-bus specification and user manual (REV 5.0) PDF (1.6 MB) UM10204_JA [English]03 Apr 2013
PCA9600 demonstration board OM6293 (REV 1.0) PDF (130.0 kB) UM10323 [English]15 Dec 2008
I2C Demonstration Board 2005-1 Quick Start Guide (REV 1.0) PDF (261.0 kB) UM10206 [English]13 Jun 2006
手册 (2)
名称/描述Modified Date
NXP® I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns (REV 1.0) PDF (3.5 MB) 75017540 [English]01 Aug 2014
Extend the I2C-bus with advanced repeaters and hubs; NXP® 2-channel I2C-bus repeaters PCA9515x and... (REV 1.0) PDF (740.0 kB) 75016532 [English]01 Jul 2008
封装信息 (1)
名称/描述Modified Date
plastic small outline package; 8 leads; body width 3.9 mm (REV 1.0) PDF (244.0 kB) SOT96-1 [English]08 Feb 2016
包装 (1)
名称/描述Modified Date
SO8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... (REV 2.0) PDF (232.0 kB) SOT96-1_118 [English]19 Apr 2013
支持信息 (3)
名称/描述Modified Date
Wave Soldering Profile (REV 1.0) PDF (20.0 kB) WAVE_SOLDERING_PROFILE [English]30 Sep 2013
Footprint for reflow soldering (REV 1.0) PDF (9.0 kB) SO-SOJ-REFLOW [English]08 Oct 2009
Footprint for wave soldering (REV 1.0) PDF (8.0 kB) SO-SOJ-WAVE [English]08 Oct 2009
订购信息
型号状态Package version应用Enable功能Operating Temperature (Cel)Number of bitsVoltage Translation Range (V)Operating voltage (VDC)Operating voltage 2 (V)InputsOutputsTTL Drive (mA)GTL Drive (mA)I2C-bus (kHz)
PCA9509DActiveSOT96-1-40~852.7~3.6_tolerant_to_5.5 VDC0.9~5.511400
封装环保信息
产品编号封装说明Outline Version回流/波峰焊接包装产品状态部件编号订购码 (12NC)Marking化学成分RoHS / 无铅 / RHF无铅转换日期EFRIFR(FIT)MTBF(小时)MSLMSL LF
PCA9509DSOT96-1SO-SOJ-REFLOW SO-SOJ-WAVE
SO-SOJ-REFLOW SO-SOJ-WAVE
Reel 13" Q1/T1ActivePCA9509D,118 (9352 822 27118)PCA9509PCA9509DAlways Pb-free0.02.05E811
Bulk PackActivePCA9509D,112 (9352 822 27112)PCA9509PCA9509DAlways Pb-free0.02.05E811
Level translating I2C-bus/SMBus repeater pca9509gm
PCA9500/PCA9501 provides simple card maintenance and control using I²C-bus PCA9553
Level shifting techniques in I2C-bus design pca9685pw
I2C / SMBus Repeaters, Hubs and Expanders pca9600
I2C-bus specification and user manual pca9685pw
I2C-bus specification and user manual pca9685pw
PCA9600 demonstration board OM6293 pca9600
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
Extend the I2C-bus with advanced repeaters and hubs; NXP® 2-channel I2C-bus repeaters PCA9515x and... pca9600
Reflow_Soldering_Profile Wave_Soldering_Profile LPC1112FD20
plastic small outline package; 8 leads; body width 3.9 mm CBT3306_Q100
Footprint for reflow soldering NPIC6C596A_Q100
Footprint for wave soldering NPIC6C596A_Q100
SO8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... CBT3306_Q100
PCA9509GM
SA612A