PCA9517D: 电平变换I2C总线转发器

PCA9517是一款CMOS集成电路,提供低电压(低至0.9 V)和更高电压(2.7 V至5.5 V)I²C总线或SMBus应用之间的电平切换。在电平切换过程中保留I²C总线系统所有工作模式和功能的同时,它还允许通过为数据(SDA)和时钟(SCL)线路提供双向缓冲以允许扩展I²C总线,从而可使用两条400 pF的总线。使用PCA9517能使系统设计师将总线电压和电容隔离成两半。SDA和SCL引脚为耐过压且在PCA9517未通电时为高阻抗。

2.7 V至5.5 V总线B侧驱动器的性能类似PCA9515A器件上的驱动器,而可调节电压总线A侧驱动器能驱动更多电流且消除静态偏移电压。这使B侧的低电平变换成A侧几乎0 V的低电平,适应更低电压逻辑的小电压摆幅。

B侧PCA9517 I/O驱动器的静态偏移设计防止其连接至具有上升时间加速器的另一器件,包括PCA9510、PCA9511、PCA9512、PCA9513、PCA9514、PCA9515A、PCA9516A、PCA9517(B侧)或PCA9518。但是,A侧可一并连接两个或多个PCA9517,这样就构成一个A侧位于共用总线上的星形拓扑,因而A侧可直接连接至带有静态或动态偏移电压的任何其他缓冲器。可按A侧至B侧串联多个PCA9517,不会积聚偏移电压,只需考虑渡越时间延迟。

除非VCCA高于0.8 V且VCC高于2.5 V,否则不会启用PCA9517驱动器。也可使用EN引脚在系统控制下打开和关闭驱动器。应该注意,当总线闲置时仅改变使能引脚的状态。

B侧内部缓冲器LOW上的输出下拉设为大约0.5 V,而内部缓冲器的输入阈值设为低大约70 mV (0.43 V)。当B侧I/O内部驱动为低电平时,输入端不会将低电平识别为低电平。这能防止发生锁定状况。A侧的输出下拉会驱动一个真正的低电平且输入电平设为0.3VCC(A)以适应系统中更低低电平的需求,其中低电压侧供电电压低至0.9 V。

PCA9517D: 产品结构框图
sot096-1_3d
数据手册 (1)
名称/描述Modified Date
Level translating I2C-bus repeater (REV 3.0) PDF (120.0 kB) PCA9517 [English]30 Jan 2007
应用说明 (3)
名称/描述Modified Date
Level shifting techniques in I2C-bus design (REV 1.0) PDF (52.0 kB) AN10441 [English]20 Jun 2007
PCA954X FAMILY OF I²C / SMBus MULTIPLEXERS and SWITCHES (REV 2.0) PDF (807.0 kB) AN262 [English]01 Oct 2004
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 (1)
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
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Reset input pin功能Operating Temperature (Cel)Number of bitsI2C-bus (kHz)Operating voltage (VDC)Operating voltage 2 (V)InputsOutputsMax Sink Current per bit (mA)No of AddressesVoltage Translation Range (V)Max Sink Current, per package (mA)Enable
PCA9517DActiveSOT96-1-40~854002.7~3.6_tolerant_to_5.5 VDC0.9~5.511
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
PCA9517DSOT96-1SO-SOJ-REFLOW SO-SOJ-WAVE
SO-SOJ-REFLOW SO-SOJ-WAVE
Reel 13" Q1/T1ActivePCA9517D,118 (9352 767 64118)Standard MarkingPCA9517Dweek 13, 20050.02.05E811
Bulk PackActivePCA9517D,112 (9352 767 64112)Standard MarkingPCA9517Dweek 13, 20050.02.05E811
Level translating I2C-bus repeater pca9517
Level shifting techniques in I2C-bus design pca9685pw
PCA954X FAMILY OF I²C / SMBus MULTIPLEXERS and SWITCHES pca9516apw
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
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
PCA9517
SA612A