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PCA9545A/45B/45C: 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.

PCA9545A_45B_45C: 产品结构框图

SOT163-1

数据手册 (1)

应用说明 (2)

用户指南 (3)

手册 (2)

封装信息 (3)

包装 (3)

支持信息 (3)

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
• PCA9545B IBIS model (REV 1.0) ZIP PCA9545B 9/2/2014
• PCA9545C IBIS model (REV 1.0) ZIP PCA9545C 9/2/2014

订购信息

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
PCA9545APW		SOT360-1	SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	PCA9545APW,118 (9352 758 09118)	PA9545A	PCA9545APW		week 13, 2005	0.0	2.0	5E8	1	1
				Bulk Pack	Active	PCA9545APW,112 (9352 758 09112)	PA9545A	PCA9545APW		week 13, 2005	0.0	2.0	5E8	1	1
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
				Bulk Pack	Active	PCA9545AD,112 (9352 758 08112)	PCA9545AD	PCA9545AD		week 13, 2005	0.0	2.0	5E8	1	1
PCA9545CPW		SOT360-1	SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	PCA9545CPW,118 (9352 833 08118)	PA9545C	PCA9545CPW		Always Pb-free	0.0	2.0	5E8	1	1
PCA9545BPW		SOT360-1	SSOP-TSSOP-VSO-WAVE	Reel 13" Q1/T1	Active	PCA9545BPW,118 (9352 833 07118)	PA9545B	PCA9545BPW		Always Pb-free	0.0	2.0	5E8	1	1
PCA9545ABS		SOT662-1		Reel 13" Q1/T1	Active	PCA9545ABS,118 (9352 758 07118)	9545A	PCA9545ABS		Always Pb-free	0.0	2.0	5E8	1	1