PCA9545AD: 4-channel I²C-bus switch with interrupt logic and reset

The PCA9545A/45B/45C is a quad bidirectional translating switch controlled via the I²C-bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual SCx/SDx channel or combination of channels can be selected, determined by the contents of the programmable control register. Four interrupt inputs, INT0 to INT3, one for each of the downstream pairs, are provided. One interrupt output, INT, acts as an AND of the four interrupt inputs.

An active LOW reset input allows the PCA9545A/45B/45C to recover from a situation where one of the downstream I²C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the I²C-bus state machine and causes all the channels to be deselected as does the internal power-on reset function.

The pass gates of the switches are constructed such that the VDD pin can be used to limit the maximum high voltage which is passed by the PCA9545A/45B/45C. This allows the use of different bus voltages on each pair, so that 1.8 V or 2.5 V or 3.3 V parts can communicate with 5 V parts without any additional protection. External pull-up resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5 V tolerant.

The PCA9545A, PCA9545B and PCA9545C are identical except for the fixed portion of the slave address.

PCA9545AD: 产品结构框图

SOT163-1

数据手册 (1)

名称/描述	Modified Date
4-channel I2C-bus switch with interrupt logic and reset (REV 9.0) PDF (294.0 kB) PCA9545A_45B_45C [English]	05 May 2014

应用说明 (2)

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

用户指南 (3)

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
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
Add design fl exibility with multi-channel I2C/SMBus muxes and switches; NXP® 2-, 4-, and 8-channel... (REV 1.0) PDF (641.0 kB) 75016529 [English]	01 Jul 2008

封装信息 (1)

名称/描述	Modified Date
plastic small outline package; 20 leads; body width 7.5 mm (REV 1.0) PDF (335.0 kB) SOT163-1 [English]	08 Feb 2016

包装 (1)

名称/描述	Modified Date
SO20; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... (REV 2.0) PDF (246.0 kB) SOT163-1_118 [English]	15 Apr 2013

支持信息 (2)

名称/描述	Modified Date
Reflow Soldering Profile (REV 1.0) PDF (34.0 kB) REFLOW_SOLDERING_PROFILE [English]	30 Sep 2013
Wave Soldering Profile (REV 1.0) PDF (20.0 kB) WAVE_SOLDERING_PROFILE [English]	30 Sep 2013

Design Support

Expert mode sample code PCA9545A (REV 1.0) TXT PCA9545A_1 12/10/2014

IBIS

PCA9545A IBIS model (REV 1.0) ZIP PCA9545A 9/2/2014

订购信息

型号	状态	Package version	Interrupt	Power-on reset	Operating Temperature (Cel)	Reset input pin	Operating voltage (VDC)	Inputs	Outputs	No of Addresses	I2C-bus (kHz)
PCA9545AD	Active	SOT163-1	yes		-40~85	yes	2.3~5.5	1	4	4	400

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	EFR	IFR(FIT)	MTBF（小时）	MSL	MSL LF
PCA9545AD		SOT163-1	Reflow_Soldering_Profile Wave_Soldering_Profile Reflow_Soldering_Profile Wave_Soldering_Profile	Reel 13" Q1/T1	Active	PCA9545AD,118 (9352 758 08118)	PCA9545AD	PCA9545AD		week 13, 2005	0.0	2.0	5E8	1	1
PCA9545AD		SOT163-1		Bulk Pack	Active	PCA9545AD,112 (9352 758 08112)	PCA9545AD	PCA9545AD		week 13, 2005	0.0	2.0	5E8	1	1